David L. Hittinger
Printreading Based on the 2017 NEC® contains procedures commonly practiced in industry and the trade. Specific procedures vary with each task and must be performed by a qualified person. For maximum safety, always refer to specific manufacturer recommendations, insurance regulations, specific job site and plant procedures, applicable federal, state, and local regulations, and any authority having jurisdiction. The material contained herein is intended to be an educational resource for the user. American Technical Publishers, Inc. assumes no responsibility or liability in connection with this material or its use by any individual or organization. This textbook is intended to demonstrate how to correlate electrical construction plans with the installation rules in the NEC®. Refer to the NEC® to apply the rules accordingly. The plans included with this textbook are drawings created for real-world projects. As is often the case in industry, the plans will not always reflect final construction. American Technical Publishers, Inc., Editorial Staff Editor in Chief: Jonathan F. Gosse Vice President — Editorial Peter A. Zurlis Assistant Production Manager: Nicole D. Bigos Technical Editor: Greg A. Gasior Supervising Copy Editor: Catherine A. Mini Copy Editor: Talia J. Lambarki
Cover Design: Steven E. Gibbs Art Supervisor: Sarah E. Kaducak Illustration/Layout: Nick G. Doornbos Steven E. Gibbs Digital Media Manager: Adam T. Schuldt Digital Resources: Cory S. Butler
The author and publisher are grateful to the following companies, organizations, and individuals for providing photographs, plans, information, and technical assistance. Barclay and Associates
Crouse-Hinds Division, Cooper Industries, Inc.
Linden Group Architects
Dudley and Glenna Elvery
Rockwell Automation, Allen-Bradley Company, Inc.
Eaton Bussmann Division
Rodger A. Brooks, Architect
S. Joseph Goble, Inspector/Instructor
General Electric Company
Square D Company
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© 2017 by American Technical Publishers, Inc. All rights reserved 1 2 3 4 5 6 7 8 9 – 17 – 9 8 7 6 5 4 3 2 1 Printed in the United States of America ISBN 978-0-8269-1573-3
This book is printed on recycled paper.
About the NEC® NATIONAL ELECTRICAL CODE® The National Electrical Code® is sponsored and controlled by the National Fire Protection Association, Inc., (NFPA). The primary function of the NEC® is to safeguard people and property against electrical hazards. It is mandatory that the Printreading Based on the 2017 NEC® be used only in conjunction with the 2017 NEC®. Copies of the 2017 NEC® (NFPA No. 70) can be ordered directly from its publisher: National Fire Protection Association, Inc. 1 Batterymarch Park Quincy, MA 02169 www.nfpa.org
WATTS AND VOLT-AMPERES In general, within the NEC®, the term watts (W) has been superseded by the term volt-amperes (VA) for the computation of loads. However, references to nameplate ratings still reflect the term watts on certain loads.
CALCULATIONS When total wattage or VA is to be divided by phase-to-phase (3φ) voltage times 1.732, the following values may be substituted: for 208 V × 1.732, use 360 for 230 V × 1.732, use 398 for 240 V × 1.732, use 416 for 440 V × 1.732, use 762 for 460 V × 1.732, use 797 for 480 V × 1.732, use 831
MANDATORY USE OF SHALL Section 90.5(A) states that mandatory rules use the word shall or shall not. Always refer to the NEC® for mandatory rules.
INFORMATIONAL NOTES Informational Notes (Notes) are explanatory or provide additional information. Notes are not mandatory and do not contain any mandatory provisions. See 90.5(C).
FRACTIONS OF AN AMP Section 220.5(B) states that for calculations, fractions less than 0.5 may be dropped.
THW Cu Unless otherwise specified, copper conductors are sized on THW per Table 310.15(B)(16).
The National Electrical Code® • NEC® Process • Using the NEC® • NEC® Revisions and Extracted Text • Applying the NEC® • New NEC® Articles • Prints • Shape Description • Written Description • Abbreviations • Symbols • Printreading • Plot Plan • Foundation and Unfinished Basement Plan • Floor Plan • Elevation Views • Sections and Details
Trade Competency Test 1 Trade Competency Test 2 Trade Competency Test 3 Trade Competency Test 4
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One-Family Dwellings • Calculations • One-Family Dwellings – Standard Calculation • One-Family Dwellings – Optional Calculation • Dwelling A • Dwelling B
Trade Competency Test 1 Trade Competency Test 2 Trade Competency Test 3 Trade Competency Test 4
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Conductors • Table 310.15(B)(16) • Table 310.15(B)(17) • Tables 310.15(B)(18) and 310.15(B)(19) • Table Adjustment Factors • Table 310.104(A) – Conductor Application and Insulations • Table 402.3 – Fixture Wire • Table 402.5 – Ampacity of Fixture Wires • Flexible Cords • Table 400.4 – Flexible Cords and Cables • Apartments—Floor Plan • Load Calculations • Service Calculations • Apartments—Details and Elevations
Trade Competency Test 1 Trade Competency Test 2 Trade Competency Test 3 Trade Competency Test 4
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Reading Prints • Excerpts from Specifications • 29.1 Main Service – Article 230 • 29.4 Conductors – Article 310 • 29.5 Wiring Methods and Materials—NEC® Chapter 3 • 29.6 Equipment for General Use—NEC® Chapter 4 • 29.7 Audio System Equipment and Communication Circuits—640 and 800 • 29.8 Appliances—Article 422 • Electrical Plans • Second Floor Plan • Calculations for Panel E • Calculations for Panel D • First Floor Plan • Calculations for Panel B • Calculations for Panel A • Calculations for Panel C • Basement Floor Plan • Calculations for Basement Panel • Service Calculation • Service Conduit Size • 480 V Lighting System • Aluminum Wire and Conduit
Trade Competency Test 1 ____________________________________________________ 147 Trade Competency Test 2 ____________________________________________________ 149 Trade Competency Test 3 ____________________________________________________ 151 Trade Competency Test 4 ____________________________________________________ 153 Printreading Test 1 __________________________________________________________ 155 Printreading Test 2 __________________________________________________________ 157
Industrial Locations and Special Equipment
Power Installation for Industrial Plant • Motor Circuits • Application • Elevator Motor • Feeder Supplying Two or More Motors • Crane Motors • Metalworking Machine Tools • Synchronous Motor • X-Ray Unit • Resistance Welders • Transformer Arc Welders • Motor-Generator Arc Welder • Feeder Calculations • Service Calculations • Power Installation for Restaurant • Circuit Analysis • Service Calculation
Trade Competency Test 1 ____________________________________________________ 199 Trade Competency Test 2 ____________________________________________________ 201 Trade Competency Test 3 ____________________________________________________ 203 Printreading Test 1 __________________________________________________________ 205 Printreading Test 2 __________________________________________________________ 207
Classes • Methods for Reducing Hazards • Specially Listed Occupancies
Trade Competency Test 1 Trade Competency Test 2 Trade Competency Test 3 Trade Competency Test 4
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Overview of the Woodland Residence • Reflected Ceiling and Electrical Plan • Electrical Symbols List • First Floor Reflected Ceiling and Electrical Plan—Sheet A-7 • Sheet A-7 Notes • Second Floor Reflected Ceiling and Electrical Plan—Sheet A-8 • Loft • Library • Bath 4 • Basement Electrical and Reflected Ceiling Plan—Sheet A-3.1 • Finished Basement • Elevator • Utility Room • Studio/Garage—Sheet GE-1 • First Floor Electrical Plan • Second Floor Electrical Plan • Gate and Fence Plan—Sheet G-1 • Specifications—Sheet DTL-3 • One-Line Diagram—Sheet O-1
Printreading Test 1 __________________________________________________________ 257 Printreading Test 2 __________________________________________________________ 259 Printreading Test 3 __________________________________________________________ 263 Printreading Test 4 __________________________________________________________ 267
Final Trade Competency Tests
Test 1 ____________________________________________________________________ 271 Test 2 ____________________________________________________________________ 275
Learner Resources • Quick Quizzes® • Illustrated Glossary • Flash Cards • Print Sets
• Printreading Tests • Interactive Printreading Activity • Media Library • ATPeResources.com
Introduction Printreading based on the 2017 NEC® provides a thorough foundation for understanding drawings and concepts related to electrical printreading and includes important changes that appear in the 2017 National Electrical Code® as they pertain to one-family dwellings, multifamily dwellings, commercial locations, industrial locations, special equipment, and hazardous locations. Electrical plans are used in conjunction with NEC® requirements to familiarize the learner with standards that promote best practices. This informative textbook serves as both an instructional tool and a valuable technical reference for professionals in the field.
Topic Definitions identify the focus of each chapter.
Quick Response (QR) Codes offer easy access to related information using mobile device technology.
Objectives direct attention to specific concepts that guide reading.
Calculations depict applications commonly found in the field.
References to the 2017 NEC® are presented throughout the text.
Electrical Plans provide examples of actual plans used in industry.
NEC® Requirements specific to printreading applications correspond with figures relevant to the Code.
Color Photographs and Prints visually enforce topics covered in the textbook.
TESTS Trade Competency Tests review content and apply concepts that promote and enhance learning. Printreading Tests are based on prints included in the book and NEC® standards to provide a more in-depth assessment of comprehension. Two Final Trade Competency Tests are included in Chapter 8 and provide a comprehensive assessment of the text. Answers with NEC® references for all tests are included in the Printreading Based on the 2017 NEC® Answer Key. Printreading Tests based on prints and NEC® standards provide a more in-depth assessment tool. Trade Competency Tests promote critical thinking while reinforcing material presented in the text.
Final Trade Competency Tests provide a thorough evaluation of printreading applications.
NEC R REFERENCE
LETTER REPRESENTING ANSWER
MULTIPLE CHOICE FORMAT
______________ ______________ 13. A heavy-duty, admedium lampholder shall have a rating of not less than ___W. A. 150 C. 600 B. 300 D. 660
Digital Resources Printreading Based on the 2017 NEC® includes access to online Learner Resources that reinforce textbook content and enhance learning. These online resources can be accessed using either of the following methods: • Key ATPeResources.com/QuickLinks into a web browser and enter QuickLinks™ Access code • Use a Quick Response (QR) reader app to scan the QR Code with a mobile device.
Printreading Based on the 2017 NEC ® includes a variety of digital resources designed to reinforce printreading skills and enhance understanding of each chapter. The Digital Resources include the following: • Quick Quizzes® that provide interactive questions for each chapter with embedded links to highlighted content within the textbook and to the Illustrated Glossary • Illustrated Glossary that provides a helpful reference to commonly used terms, with selected terms linked to textbook illustrations • Flash Cards that provide a self-study/review tool for learning NEC®-related terms and definitions and common printreading symbols • Print Sets consisting of digital versions of the prints used in the textbook that can be viewed on screen for easy reference • Printreading Tests that provide an opportunity to read electrical prints and apply knowledge of the NEC ® • Interactive Printreading Activity that helps develop the learner’s understanding of how two-dimensional plans are translated to a real-world space • Media Library that consists of videos and animations that reinforce and expand upon textbook content • ATPeResources.com, which links to additional instructional resources
Also Available from American Technical Publishers… Electrical Load Calculator App This app helps to calculate the specified conductor sizes for a one-family dwelling. The app allows quick completion of the calculation process by simplifying the six individual calculations to determine the required ampacity.
Printreading Applications OBJECTIVES
The Woodland residence is a two-story residential home constructed on a 4-acre lot in the midwestern United States. It includes a separate studio/garage and a perimeter fence with automated gates. The electrical plans included in the back of this book, along with the detailed explanations throughout Chapter 7, provide a comprehensive study of the electrical system.
• Identify and explain the different types of electrical symbols. • Explain the NEC® standards that relate to light-fixture (luminaire) installation in clothes closets. • Describe how notes are used on a print and give an example. • Identify the NEC® article that covers elevator installations. • Describe the use for specification sheets. • Explain the purpose of one-line diagrams for the electrical service.
OVERVIEW OF THE WOODLAND RESIDENCE
The set of plans for the Woodland residence includes seven sheets. These sheets focus mainly on the elements of the electrical system. The sheets include the following: • A-7 — First Floor Reflected Ceiling and Electrical Plan • A-8 — Second Floor Reflected Ceiling and Electrical Plan • A-3.1 — Basement Electrical and Reflected Ceiling Plan • GE-1 — Studio/Garage • G-1 — Gate and Fence Plan • Specifications • O-1 — One-Line Diagram
The Woodland residence is an 8200 sq ft residence that rests on a 4-acre lot. The house was built to accommodate social events and be wheelchair accessible as illustrated by the wide hallways and flat threshold at the main entrance. The main house includes a spacious great room, a workroom, and a screened-in porch that includes a wood-burning pizza oven. The basement includes a billiard room, utility room, and wine cellar. A separate studio/garage building is located in the rear yard of the main house. The exterior design matches the main house and includes a second-floor studio above the two-car garage on the first floor. A first-floor workshop is adjacent to the garage. Other features include a porte-cochère, automated entry and exit gates, and a one-story structure near the back of the lot that is supplied with electricity.
The Woodland residence was designed to include various environment-friendly features including geothermal technology.
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REFLECTED CEILING AND ELECTRICAL PLAN
As the name states, the reflected ceiling plan is a reflection, or mirror image, of electrical elements that are located in or on the ceiling. The reflected ceiling plan and electrical plan are combined into one drawing that shows all of the devices that make up the electrical plan. An electrical symbols list and notes are also included on the plan.
Electrical Symbols List The electrical symbols list identifies all of the electrical symbols located on the drawings. Electrical symbols represent receptacles, light fixtures, switches, etc. Publications available from standards organizations, such as the American National Standards Institute (ANSI), include standard symbols used to represent the building materials and components. For example, ANSI Standard Y32.9, Graphic Symbols for Electrical Wiring and Layout Diagrams Used in Architecture and Building Construction, includes standard symbols that represent various electrical devices and components. While standard symbols are recommended for use, symbols may vary depending on the architect. Receptacles. The types of receptacles used include duplex receptacles, switch-controlled duplex receptacles, ground-fault circuit interrupter (GFCI) receptacles, and weather-resistant GFCI receptacles. When electrical loads such as freestanding lamps, computers, and televisions (TVs) are not known, generalpurpose duplex receptacles are installed around a room to allow access to power as required. Duplex receptacles are the most common type of receptacles used for general power distribution throughout residential buildings. See Figure 7-1. A switch-controlled duplex receptacle is a receptacle in which half of the receptacle is controlled by a switch and the other half is always energized. A duplex receptacle can be modified by removing the ungrounded or hot-wire tab normally indicated by a black or brass screw on the receptacle. The ungrounded circuit conductor is attached to one screw, and the switch leg conductor is attached to the other. This allows switched control of one half of the duplex receptacle commonly used to provide power for table and floor lamps. The neutral tab, normally indicated by a silver or white screw, should never be broken on a switchcontrolled duplex receptacle.
Figure 7-1. Duplex receptacles are the most common type of receptacle used throughout a residence. The receptacles in the Woodland residence uniquely blend in to the rest of the house.
A ground-fault circuit interrupter (GFCI) receptacle is a receptacle that detects ground faults and then quickly disconnects the power from the receptacle in the affected circuit. A ground fault exists any time current takes a path that it was not designed to take. A GFCI is designed to trip open when current is above the level that will cause a dangerous shock. The trip level of a Class A GFCI is 4 mA to 6 mA. Prints commonly show the abbreviation “GFI” to indicate a GFCI. T E C H FAC T The NEC requires that GFCIs be installed in new kitchens, bathrooms, crawl spaces, garages, wet bars, and several other areas. ®
Receptacles in Wet Locations. Receptacles of 15 A and 20 A, 125 V and 250 V installed in wet locations shall have an enclosure that is weatherproof regardless of whether the attachment-plug cap is inserted. The receptacles shall be listed as weather-resistant as indicated by “WR” on the face of the receptacle. GFCI protection is required and can be accomplished with a GFCI circuit breaker or a GFCI receptacle. All enclosures installed in wet locations for 15 A and 20 A, 125 V and 250 V receptacles are to be listed and of the extra-duty type. There are numerous GFCI receptacle locations on the exterior of the main house and the detached garage. NEC® Section 406.9(A) and (B) provide the installation rules for receptacles installed in wet and damp locations. See Figure 7-2.
Chapter 7 — Printreading Applications 243
RECEPTACLES IN WET LOCATIONS
control lights, receptacles, and devices from one location. Single-pole switches also control exhaust fans and small motors such as dishwashers and disposals.
RECEPTACLES IN DAMP LOCATIONS
Figure 7-3. Outdoor receptacles that are installed in damp locations have a weatherproof cover.
Figure 7-2. Receptacles rated for 15 A and 20 A in wet locations have an enclosure that is weatherproof even when the attachment plug cap is inserted.
Receptacles in Damp Locations. A receptacle installed outdoors in a location protected from the weather or in other damp locations shall have an enclosure for the receptacle that is weatherproof when the receptacle is covered. A damp-location receptacle shall be considered to be in a location protected from the weather when located under roofed open porches, canopies, marquees, and the like and not subjected to beating rain or water runoff. The covered stoop area of the front door is an example of a damp location. See Figure 7-3. Switches. Electrical circuits typically include control components, such as switches, to control the flow of current in an electrical circuit. The most common types of switches used in lighting circuits are single-pole, three-way, and four-way switches. A single-pole, single-throw (SPST) switch has an ON (closed) position and an OFF (open) position. Singlepole switches are the most commonly used switches to
A three-way switch is a single-pole, double-throw (SPDT) switch that is used to control lamps from two switch locations. Three-way switches are used to control the lighting from two locations in the kitchen and great room. Interior stairways shall include a wall switch at each floor level and landing level that includes an entryway to control the lighting receptacle(s) where the stairway between floor levels has six risers or more. The stairways leading to the second floor and both stairways to the basement have three-way switches. A four-way switch is a double-pole, double-throw (DPDT) switch that is used between two three-way switches when controlling a lamp from three or more switch locations. Four-way switches are used to control the lighting from multiple locations throughout the foyer area. Other electrical switches, such as dimmers, are used for specialized functions. Dimmer switches are used throughout the home to control the brightness of the light. Light Fixtures. Lighting symbols are used on prints to show the fixture locations, types of lamps (incandescent, fluorescent, or light-emitting diode), and styles (recessed or surface) of the fixtures. For example, fluorescent surface-mounted lighting is used in the laundry room and recessed lighting is used in the workroom.
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In addition to showing the lamp location and type of lamp, lighting symbols also show the type of required light-fixture mounting (ceiling or wall). Various ceiling-mounted fixtures are located in the foyer and hallway, and a wall-mounted light fixture is located in the first-floor bathroom (PR 1). See Figure 7-4. CEILING/WALL-MOUNTED LIGHTING FIXTURES
Boxes used at lighting or lamp holder receptacles in or on a vertical surface shall be identified and marked on the interior to indicate the maximum weight of the fixture permitted to be supported by the box if other than 50 lb. Plaster rings that are secured to other boxes are acceptable, provided that not less than two No. 6 or larger machine screws are used. Ceiling-mounted reinforced junction boxes may be used for custom pendant or chain-hung light fixtures. The reinforced junction boxes provide the flexibility to add lighting that may exceed the 35 lb limit of standard junction boxes. T E C H FAC T Junction boxes are used to protect wiring connections, provide access to wiring, and provide a method for mounting electrical equipment. They are also used for pulling conductors. Junction boxes are available in a variety of sizes and types. Reinforced junction boxes allow for the installation of heavy chain-hung light fixtures or chandeliers.
CEILING-MOUNTED LIGHTING FIXTURES
The term “light fixture” has been used traditionally to describe a type or style of electric light. This term is commonly used on prints. The term “luminaire” is used by the NEC® and other standards organizations. The NEC® describes a luminaire as the light and all components directly associated with it, including the elements that protect the light source and distribute the light. On prints, the two terms are typically used interchangeably, but “luminaire” is the defined term in the NEC®. Exhaust Fans. The half bathrooms (PR 1 and PR 2) on the first floor of the main house have exhaust fans on separate switches from the lighting. Some mechanical codes require exhaust fans in any bathroom that does not have a window for natural ventilation. The master bath has two exhaust fans located in the bathtub area and the toilet room. Telephone Outlets. Telephone outlets are conveniently located in the master bedroom, den, kitchen, laundry, garage, and workroom of the main house. The electrician may install telephone wiring, but the utility phone provider often makes the final connections.
WALL-MOUNTED LIGHTING FIXTURES Figure 7-4. An example of a ceiling-mounted light fixture is in the hallway, and an example of a wall-mounted lighting fixture is in the first-floor bathroom.
Combination Smoke / Carbon Monoxide Detectors. This intelligent combination alarm provides protection from both fire and carbon monoxide (CO). The device uses technology to offer a fast response to fires, including smoldering and open flame, as well as protection from CO. See Figure 7-5.
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COMBINATION SMOKE/CO DETECTORS
Branch circuits required for lighting and appliances, including motor-operated appliances, shall be provided to supply the loads calculated in accordance with NEC® Section 220.10. In addition, branch circuits shall be provided for specific loads not covered by Section 220.10 where required elsewhere in the NEC ®. The elevator is one example of a specific load that may include special controlcircuit wiring and must comply with NEC® Article 620. Some residential elevators come as a complete listed unit and are installed by workers trained in elevator installation.
Figure 7-5. Some combination smoke/CO detectors use voice alarms such as “fire” or “carbon monoxide” to distinguish the type of hazard detected.
FIRST FLOOR REFLECTED CEILING AND ELECTRICAL PLAN — SHEET A-7 Sheet A-7, First Floor Reflected Ceiling and Electrical Plan, provides the locations of the receptacles, light fixtures, switches, telephone outlets, etc., in each room on the first floor. Most outlets of a residential project are mounted at the same height, with the location of each identified on the floor plan. Receptacles shall be installed such that no point measured horizontally along the floor line of any wall space is more than 6′ from a receptacle. Ceiling light fixtures are typically centered in a room. Mounting dimensions are only shown for light fixtures, outlets, and switches that are not typical installations. The branch circuits for light fixtures, switches, and switched outlets are indicated by dashed or solid lines. The lines only indicate circuit connections, not the actual route of a cable or raceway. The architect and owner work together to determine the light fixture types and switching locations as well as any special electrical requirements such as the floor receptacles in the great room and workroom. The NEC® provides the minimum electrical installation requirements for lighting and receptacle placement. Special equipment, such as audio, security, and communication systems, can be designed into any home.
The First Floor Reflected Ceiling and Electrical Plan shows the locations of various electrical installations including ceilingmounted lighting.
Entrance Area. The entrance area includes a portecochère and covered porch, or stoop. A porte-cochère is a covered entrance area where vehicles release passengers. The porte-cochère includes four recessed light fixtures that are controlled near the main entrance. Two ceiling-mounted duplex receptacles are installed for decorative holiday lighting that will eliminate the use of extension cords. A chain-hung chandelier is located in the center of the porte-cochère as a focal point of the ceiling. See Figure 7-6.
246 NEC® PRINTREADING
RECESSED LIGHTING FIXTURE
CEILING-MOUNTED DUPLEX RECEPTACLE Figure 7-6. The porte-cochère contains a number of electrical devices and light fixtures including ceiling-mounted duplex receptacles, a chain-hung chandelier, and recessed lighting fixtures.
The covered porch includes several types of light fixtures. There are four decorative light fixtures on the front columns to illuminate the entrance to the home. A decorative chain-hung light fixture hangs above the front door. See Figure 7-7. Ground-mounted lights located at the base of the covered porch columns accent the face bricks. The GFCI receptacles on each side of the front door entrance in the covered porch area are in a damp location. This location will require receptacle enclosures that are weatherproof when the receptacles are covered. Foyer. The foyer leads to the dining room that joins the great room and kitchen, creating a large open space. Three light switches are located by the front door. Two switches control the lights in the porte-cochère and the lighting in the covered porch. The third switch controls the recessed interior lights that highlight the foyer. See Figure 7-8. The foyer area that is not part of a hallway with an area of more than 60 sq ft shall have receptacles located in each wall space of 3′ or more in width for NEC® compliance.
Figure 7-7. The decorative chain-hung light fixture and other lighting fixtures near the covered porch are architectural details that enhance the overall appearance of the home and add unique characteristics for a custom distinction.
Chapter 7 — Printreading Applications 247
garden. The master bedroom closet has four recessed incandescent fixtures with enclosed light sources. Recessed incandescent fixtures over the tub and shower area must be marked suitable for damp or wet locations if subject to water spray. See Figure 7-9.
Figure 7-8. The recessed lighting in the foyer is controlled by a switch located by the front door.
Clothes Closets. Light fixtures in clothes closets are covered in NEC® Section 410.16. Light fixtures in clothes closets are limited to certain types to minimize possible exposure to stored material. Exposed incandescent lamps are not permitted. Accidental breakage of an incandescent lamp could produce sparks that could ignite stored fabrics. A minimum 12″ clearance between light fixtures installed in clothes closets and the nearest point of a closet storage space shall be maintained. Light fixtures can be installed on the wall above the door or on the ceiling. A decorative surface-mounted incandescent light with an enclosed lamp is located in the first-floor walk-in closet that is NEC®-compliant. Master Bedroom. The master bedroom (M. Bedroom) has a walk-in closet (W.I.C.) and a bathroom (M. Bath) that contains a double sink, shower, and whirlpool tub. A separate exterior door provides access to the outdoor
Figure 7-9. Incandescent lighting is used throughout much of the house including the master bathroom.
Dining Room. The dining room includes several recessed light fixtures and space for cove lighting. Cove lighting is used to minimize glare and provide a soft light throughout the room. Coves shall have adequate space and shall be located so that lamps and equipment can be properly installed and maintained. The idea behind cove lighting is to provide even illumination without shadows, which is accomplished with fluorescent or light-emitting diode (LED) lighting. See Figure 7-10. NEC® Section 410.18 provides installation rules for cove spaces.
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DINING ROOM COVE LIGHTING
Figure 7-10. Cove lighting is used in the dining room and other areas throughout the house.
Kitchen. The kitchen includes an island and wet bar with a serving space and a walk-in pantry. Two or more small-appliance branch circuits are required to serve the kitchen, pantry, and dining room for all wall receptacles, countertops, and receptacles for refrigeration equipment. A door leads to the screened porch where a masonry fireplace and a prefabricated wood-fired pizza oven exist. The porch is considered a damp location, and weather-resistant receptacle covers are required. At least one wall switch-controlled lighting receptacle shall be installed to illuminate the exterior side of outdoor entrances or exits at grade-level access leading to the porch and to the exterior yard.
Great Room. The great room is a large open space of 520 ft2 with an open ceiling to the second-floor roof. The couch and reclining chairs are located in the middle of the room, focusing on the fireplace and large wall-mounted TV above the fireplace. See Figure 7-11. Three floor receptacles are conveniently located to provide power for the table and floor light fixtures. Dimmer switches control the recessed ceiling lighting as well as pin light fixtures in the alcove spaces facing the rear yard. The great room is designed for furniture to be used in the center of the room. Preplanning furniture layout is an important consideration for receptacle placement. Three floor receptacles are located in the furniture space. See Figure 7-12. Extension cords are not permitted to run through walls or ceilings, which may cause the cords to overheat, creating a serious fire hazard. Extension cords are intended for temporary use and should never be used as a substitute for permanent wiring methods. Electrical cords shall not be nailed or stapled to walls, floors, or baseboards. Extension cords should not be pinched in doors or windows or be used under heavy furniture, which could damage the cords’ insulation. Den. The den is a cozy space with large windows facing the yard. A corner fireplace includes a wall-mounted TV above the mantel. Proper planning is necessary for the installation of cable TV and receptacles. A floor receptacle and a separate floor data outlet for low-voltage communication wiring are included. Workroom. The workroom includes a sink and countertop working space along two walls. Recessed lighting and cove lighting are used for direct and indirect illumination in the room. A floor receptacle is centered in the room under a large table. Laundry Room. At least one 20 A, 120 V branch circuit shall be provided for laundry receptacles. This branch circuit shall have no other receptacles. A recessed wall-mounted ironing board station is conveniently located in the laundry room that includes an electric iron in the wall space. T E C H FAC T
Electrical installations in the kitchen include the GFCI receptacles, lighting, and power for the hood over the stove.
A new addition to the 2017 NEC® requires the installation of at least one 120 V, 20 A branch circuit for receptacles in dwelling unit garages. This circuit may not be used for any other receptacles with an exception for readily accessible outdoor receptacles. This new requirement pertains to attached and detached garages.
Chapter 7 — Printreading Applications 249
HINGED FRAME PICTURE
Figure 7-11. A hinged frame picture above the fireplace mantel in the great room hides the flat-screen TV when not in use.
Figure 7-12. Floor receptacles are located in the furniture space of the great room to eliminate the use of extension cords that may create a tripping hazard.
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Sheet A-7 Notes Notes are included on drawings to provide distinct information for the project. Specific notes identify particular installation requirements for equipment such as the electrical supply for radiant heating in the screened-porch area and receptacles and master TV antenna/cable wiring above the fireplace mantel in the great room. The owner must determine the exact locations and mounting heights before electrical rough-in installation in these areas. The master bath note indicates cove lighting in a recessed tray but the specific light-fixture type is not specified. See Figure 7-13. The size and shape of the recessed tray will be a determining factor in selecting the lighting for this application. Other notes included on Sheet A-7 (italicized below) include the following:
NOTE COVE LIGHTING IN RECESSED TRAY
Figure 7-13. Notes on drawings can identify particular installation requirements such as the cove lighting specified in the master bathroom.
• All electrical wires are to be in conduit. It is not common practice to install wires inside conduit in dwelling units. Some municipalities, such as Chicago, require that all wiring be in conduit for residential applications. The most commonly used residential wiring method is the use of nonmetallic (NM) cable, often referred to as “Romex.” The advantages of using conduit include adding circuitry without disturbing building finishes and mechanical protection for the conductors. Generally, two types of conduit are used for oneand two-family dwelling units: electrical metallic tubing (EMT), often referred to as “thinwall,” and polyvinyl chloride (PVC). EMT is permitted in exposed and concealed work and can be used where exposed to the weather with weatherproof fittings listed for the purpose. PVC is commonly used in underground installations for the electrical service to the main house and for the underground feeders to the detached garage and train-depot-accessory structure referred to as the “yard shed” on the drawings. • Ceiling fans are to be mounted independently of junction boxes. Ceiling-suspended paddle-fan support is a major concern that must be considered in every application. Some fan blades are not perfectly balanced, and the physical movement of the blades can loosen the mechanical connections and/or supports. Per the NEC®, paddle fans shall be supported independently of a receptacle box unless the receptacle box, or system, is identified for the use. Manufacturers have developed paddle-fan boxes that safely support fans. Some designers believe the safest method is to attach the fan support directly to the building framing. See Figure 7-14.
CEILING FAN INSTALLATION
Figure 7-14. Building framing is not always in the exact location where a fan may be located. Therefore, box type and framing must be determined before the electrical box and wiring are installed.
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• Smoke detectors and carbon monoxide detectors shall activate all alarms, be wired for primary and battery-operated for secondary power. A combination smoke / carbon monoxide (CO) detection unit is available for applications in which both detection units are required. The presence of CO is possible when using natural-gas household equipment such as boilers, central heating systems, water heaters, and cookers. Open fires, which use gas, oil, coal, or wood as fuel, may also be sources of CO if the fuel does not burn completely. Venting gas appliances according to manufacturer instructions is important, and proper maintenance ensures a safe home environment. • At least one electrical receptacle in addition to those used for connections must be provided in each basement. For each unfinished basement, there shall be at least one GFCI receptacle. Some basements include finished spaces for added entertainment or family-room areas. If the portion of the finished area creates more than one unfinished basement space, at least one receptacle is required in each unfinished basement space. • The basement-stair light fixture is to have a threeway switch at the top and bottom of the stairway. It is common to have two three-way switches that control one or more stairway light fixtures. This enables the user to turn the lights on before walking up or down the stairs and turn the lights off once reaching the top or bottom of the stairs. • All closet lights shall be plunger-switched to turn on when the door opens. Plunger switches are convenient and eliminate the use of wall switches. See Figure 7-15. Clearance of 6″ must be maintained between any light fixture and the nearest point of storage space. • All light fixtures above the whirlpool, tubs, and showers shall be GFCI-protected. Light fixtures located within 8′ of the top rim of a tub or shower stall shall be marked for damp locations or marked for wet locations where subject to shower spray. A designer can exceed the NEC® standard and require all light fixtures in this space to be GFCI-protected. Some light fixtures and combination lighting exhaust fans are marked for use in shower or tub areas and require GFCI protection according to the manufacturer. Section 110.3(B) states that listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or on the label.
PLUNGER SWITCHES CLOSET DOOR
Figure 7-15. Plunger switches provide a convenient switch option, but the door must be closed when exiting the closet in order to turn off the light.
• All branch circuits that supply 125 V, single-phase, 15-amp and 20-amp receptacle outlets installed in dwelling unit bedrooms shall be protected by an arcfault circuit interrupter (AFCI). AFCI technology began in the 1990s and first appeared in the 1999 NEC®, but mandatory use was not enforced until January 1, 2002. An AFCI is intended to provide protection from the effects of arc faults by recognizing characteristics unique to arcing and by de-energizing the circuit when an arc fault is detected. The first device was in the form of a circuit breaker installed at the origin of the branch circuit. For branchcircuit extensions or modifications, a listed receptacle branch-circuit AFCI located at the first receptacle of the existing branch circuit can be used. T E C H FAC T In 1961, the GFCI was invented by Charles Dalziel who was a professor of electrical engineering at the University of California.
252 NEC® PRINTREADING
SECOND FLOOR REFLECTED CEILING AND ELECTRICAL PLAN — SHEET A-8 Sheet A-8 shows the reflected ceiling and electrical plan for the second floor. The second floor includes a loft, a library, two bedrooms, and several bathrooms. An elevator is also available.
Loft The second-floor loft includes elevator access and a pathway to the bedrooms and library. The hallway portion is open on the side facing the great room. See Figure 7-16. A hallway receptacle is located on the interior wall to satisfy the NEC® requirement to include at least one receptacle for hallways of 10′ or more in length. Also located in the loft is a combination smoke/ CO detector and a TV antenna/cable receptacle.
Library The library walls include built-in wood shelving. Receptacle boxes installed in walls constructed of wood or other combustible material shall be flush with the finished surface. The intention is to contain any arcing or sparking that may occur within the box so that it does not spread to combustible material.
Bath 4 Combination exhaust fan/lights are used in the toilet area and tub space. Multiple switches control the fans and lighting separately. Light fixtures in the shower and tub areas shall be listed for use in wet locations with covered lamps.
T E C H FAC T
The Woodland residence contains a geothermal heating system that uses an anti-freeze-filled piping loop that is installed below the surface of the ground. It draws latent heat into living areas. As the fluid flows through the tubing in the ground, it absorbs heat energy from the earth.
BASEMENT ELECTRICAL AND REFLECTED CEILING PLAN — SHEET A-3.1 Sheet A-3.1, Basement Electrical and Reflected Ceiling Plan, details the billiard room, finished basement, bath, utility room, and wine cellar. The owner determines the layout and type of light fixtures in each room and how they will be controlled. The general layout of convenience receptacles follows the installation rules in the NEC®. The NEC® rules are not as stringent in the unfinished basement areas.
Figure 7-16. The loft, which overlooks the great room, includes elevator access and leads to the bedrooms and library on the second floor.
The finished basement has a combination of drywall and suspended-ceiling grid and tile. Suspended ceilings allow access to the space above, while drywall is a finished ceiling surface that is fixed. The walls in the finished basement have the same receptacle spacing requirements as the first and second floors. Recessed lights are spaced throughout the finished basement with multiple switches for varying degrees of lighting. An elevator is located adjacent to the basement stairway that can be used to transport people and heavy objects, such as holiday decorations, to be stored in the unfinished basement.
Chapter 7 — Printreading Applications 253
Elevator A prefabricated, hydraulic residential elevator is located at the base of the staircase on the finished-basement side that provides access to the first and second floors. Feeder and branch-circuit conductors and wiring methods shall meet the requirements in NEC® Article 620 for elevator installations. See Figure 7-17.
A basement wine cellar provides a room to store wine in a controlled environment. A curved wood ceiling provides a unique architectural design for a distinct feature that includes recessed lighting.
STUDIO/GARAGE — SHEET GE-1 Sheet GE-1 shows a separate studio/garage building. This structure is located in the rear yard of the main house. See Figure 7-18. The footprint of the 1.5-story structure is 1413 ft2, as noted on the first-floor plan. The 797 ft2 area on the second floor is a finished space. An 8′ wide window seat faces the side yard. The electrical plan provides the locations of lighting, receptacles, and electric garage door motors. STUDIO/GARAGE
Figure 7-17. In addition to elevators, NEC® Article 620 covers the installation of electrical equipment for dumbwaiters, escalators, moving walks, platform lifts, and stairway chairlifts.
Utility Room The utility room is unfinished and houses the electrical equipment and data systems. Surface-mounted fluorescent lighting illuminates the area. At least one receptacle is required in this unfinished basement area.
Figure 7-18. The studio/garage is a structure separate from the rest of the Woodland residence. The first floor includes a garage and a workshop. The second floor includes an artist studio.
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First Floor Electrical Plan
The detached two-car garage design includes the second-floor artist studio. The large room adjacent to the garage is used as a wood shop with woodworking equipment, including a dust-collection system. Individual special circuits are installed for each piece of equipment to allow simultaneous operation during projects. Certain wood-cutting saws and shaping equipment motors require 240 V, while other bench-mounted equipment operates on 120 V circuitry. The voltage and amperage ratings on the electric equipment label should be checked to determine the proper branch-circuit and wiring requirements for a safe electrical installation that will not overload the electrical system.
Second Floor Electrical Plan The artist studio is a finished area including a full bath. A double sink is included in the counter space along the stairway wall. Three-way switches provide convenient operation of the stairway lighting from the bottom and top of the landing. A smoke detector is located at the top of the stairs to warn when fire may be present.
GATE AND FENCE PLAN — SHEET G-1 Sheet G-1, Gate and Fence Plan, show the two driveway entrances off of Western Avenue. The north and south entrances are secured with gates and automatic opening and closing detectors as well as an access-control device (digital-key access pad). See Figure 7-19. The swinging gates are supported on masonry columns with decorative lights and 4″ cutstone pitched caps to finish the tops of the columns. A 6′ high black fence connects the north and south gates to secure the front road portion of the property. An intercom system is used to alert the owner to open the gate or deny entry. The driveway detection loops close the gates after a vehicle has cleared the entrance. The half-circle driveway allows vehicles to exit the property with automatic gate open/close sensors to secure the front area. The electrical contractor coordinates the installation of the detection loops in the driveway. The electrical contractor also works with the masonry contractor to install conduit for the decorative lights on the columns and the wiring for the gate access pads and access-control devices.
Figure 7-19. An access-control device can be used to open the gates at the north end of the driveway.
SPECIFICATIONS — SHEET DTL-3 Sheet DTL-3 shows the specifications for the Woodland residence. The general contractor and all subcontractors must have a clear understanding of the specifications on Sheet DTL-3. The specifications designate explicit requirements that are in addition to the construction drawings for each trade. It is common practice when estimating a project to read the specification sheet first to identify any specialty items, such as the whirlpool tub, prefabricated elevator, and 25 kW generator, that may have an effect on the overall project cost and delivery procedures.
Chapter 7 — Printreading Applications 255
ONE-LINE DIAGRAM — SHEET OL-1 Sheet OL-1 shows a one-line diagram of the electrical service. A one-line diagram provides an overall view of the power distribution in a building. The general location of electrical equipment and the equipment designations are typically included on one-line diagrams. The one-line diagram shown on Sheet OL-1 illustrates the interconnections between the transformer, primary panel, subpanels, generator transfer switch, and the generator. See Figure 7-20.
The one-line diagram begins at the utility transformer (T) with a 400 A transformer cabinet and meter enclosure. The primary panel (PP-1) located inside the house includes a 400 A main service-disconnect switch. The house subpanel (PP-2) is also located in the main house on the first floor in the workroom. The studio/ garage subpanel (PP-3) provides electrical service for the detached two-story garage in the rear yard. The generator panel and transfer switch (PP-4) located in the basement adjacent to the main service panel controls a 25 kW oil-cooled generator. See Figure 7-21.
AUTOMATIC TRANSFER SWITCHES
Figure 7-20. The 25 kW generator used as a back-up to the power system is located between the house and studio/garage.
Figure 7-21. An automatic transfer switch is used to operate the generator when there is a power outage.
256 NEC® PRINTREADING
Printreading Test 1 Name
Refer to the Woodland Residence plans to answer the following questions.
1. All 125 V, 1φ receptacles not exceeding 30 A and located within 1.83 m (6′) of a hydro massage tub, measured horizontally from the inside walls, shall be protected by a(n) .
2. Types of luminaires that are permitted in clothes closets shall comply with Section of the Code.
3. Cove lighting installed in the master bathroom shall have adequate space and shall be located so that lamps and equipment can be properly installed and maintained.
4. All recessed luminaires installed in direct contact with insulation shall be marked as Type .
5. The general receptacle spacing requirements for all dwelling units are located in Section of the NEC®.
6. The floor receptacle outlets shown in the middle of the workroom are always counted as part of the required number of receptacle outlets as described in Section 210.52(A)(1).
7. The ceiling-mounted decorative light fixture in the covered stoop area weighs 90 lb. Special mounting provisions that apply to this installation are located in Section of the NEC®.
8. All exterior luminaires that are exposed to weather shall be marked .
9. The lighting outlets in the stairways shall be controlled from each floor level where the stairway between floor levels has six risers or more.
10. The maximum distance between kitchen countertop receptacles shall not exceed . A. 12″ C. 3′ B. 24″ D. 6′ T
11. The first-floor powder room light fixture, exhaust fan, and GFCI receptacle are permitted to be on the same 120 V, 20 A branch circuit.
12. A total of 4″ utility sleeves are required. A. three C. nine B. six D. twelve
13. The electric service meter is located on the side of the studio/garage. A. north C. west B. east D. none of the above 257
258 NEC® PRINTREADING
���������� T F 14. The attic ventilator is designed to operate automatically to remove heat and humidity from this space when temperatures exceed 100°F. The automatic operation of the equipment provides an exception to the attic lighting requirement. ����������
���������� 15. The kitchen island and peninsula countertop are greater than 10′ in length and both include a sink. Since there is no wall space, the minimum number of receptacles required is ___. A. zero C. three B. two D. four
���������� T F 16. The screen porch includes a wood-fired cooking oven. Therefore, the kitchen GFCI receptacle requirements will apply to this space. ����������
���������� 17. The duplex receptacle outlets installed in the wine cellar require ___ protection. A. GFCI C. both A and B B. AFCI D. none of the above
���������� 18. Large kitchens that exceed 300 sq ft require a minimum of ___ or more 20 A small-appliance branch circuits. A. two C. four B. three D. five
���������� 19. The basement area includes one large finished area and two unfinished areas for storage and equipment. A total of ___ GFCI receptacle(s) is/are required for the unfinished spaces. A. one C. three B. two D. four
���������� T F 20. At least one 125 V, 1φ, 15 A- or 20 A-rated receptacle outlet is required within 50′ of the electrical service equipment. ����������
���������� 21. The circuit breaker panel located in the studio garage includes a main breaker for disconnecting all ungrounded conductors that supply or pass through the building. The main breaker is ___. A. optional equipment C. protected by GFPE B. protected by AFCI equipment D. always required
���������� 22. Generally, feeder conductors shall have an ampacity not less than the calculated load and be sized to prevent the maximum total voltage drop on both feeders and branch circuits to the farthest outlet. The train depot feeder is ___′ and not to exceed 5%. A. 50 C. 100 B. 70 D. 300
���������� T F 23. The detached garage and yard shed supplied by feeders shall have a grounding electrode installed at each structure. ����������
���������� 24. No. ___ AWG XHHW aluminum conductors can be substituted for the copper feeder conductors to the detached garage subpanel. A. 10 C. 1/0 B. 2 D. 2/0
���������� 25. The branch circuit supplying the ___ receptacle outlets is permitted to also supply receptacles in the unfinished basement. A. bedroom C. laundry room B. kitchen D. bathroom
Printreading Test 2 Name
Refer to the Woodland Residence plans to answer the following questions.
1. The size of the copper equipment grounding conductor run with the supply conductors to the detached garage is AWG. A. 10 C. 6 B. 8 D. 4
2. The total connected kVA for PP-1 is . A. 17.91 C. 80.91 B. 23.91 D. 95.10
3. The voltage rating and amperage rating of Panel PP-1 is . A. 120/240 V, 100 A C. 240/120 V, 400 A B. 208/120 V, 60 A D. 480/277 V, 200 A
4. The total connected load for phase A and B in PP-3 is 26.83 kVA. To find the total amperes, divide by and provide a 125 A main breaker. A. 120 C. 220 B. 208 D. 240
5. The size of the copper grounding electrode conductor required to connect to the concrete-encased steel reinforcing rods is AWG. A. 10 C. 6 B. 8 D. 4
6. The main entrance elevation and the detached studio garage detail provide exterior lighting fixtures to enhance the exterior of these structures. A. 5 C. 10 B. 8 D. 12
7. The east wall of the studio garage is â€˛ from the property stake on Western Avenue. A. 195.93 C. 358.26 B. 264.19 D. 662.01
8. The north gate entrance has a total of decorative light fixtures. A. 5 C. 12 B. 10 D. 15
9. The north and south gates are controlled by four photo eyes and embedded loops in the driveway. A. three C. six B. four D. eight
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���������� 10. The watts per square foot when calculating the general lighting load for the studio garage is ___. A. 3 C. 6 B. 4 D. not specified
���������� 11. The minimum depth of the underground conduit feeding the train depot is ___. A. 6″ C. 18″ B. 12″ D. 2′
���������� 12. All exterior site lighting, yard lighting, garage exterior lighting, and house exterior lighting is operated by a ___. A. photo eye C. three-way switch B. time switch D. all of the above
���������� 13. Radiant floor heat is specified to be installed in the ___. A. patio, garage, and enclosed porch B. workshop, basement, and studio bathroom C. garage, workshop, studio garage, and basement D. workshop, master bathroom, and basement
���������� T F 14. When installing wiring through wood rafters and ceiling joists, cutting and notching of beams shall not be located in the middle one-third of the span. ����������
���������� 15. The electrical contractor shall install a security and alarm system not to exceed an allowance of $___. A. 2,500 C. 7,500 B. 5,500 D. 40,000
���������� 16. Ground rods are specified to be C\v″ × 10′ and shall be driven to a depth of not less than ___′. A. 6 C. 9 B. 8 D. 10
���������� 17. Rod and pipe type electrodes shall be made of ___ material. A. galvanized steel C. copper-coated B. stainless steel D. all of the above
���������� 18. The coaxial cable wiring and installation for systems that provide voice, data, video, and audio in residential applications shall comply with NEC® Article ___. A. 728 C. 800 B. 770 D. 830
���������� 19. Arc fault circuit interrupters are required in the ___. A. laundry, basement, and attic B. dining rooms, hallways, and garage C. sunroom, closets, and porch D. dens, bedrooms, and libraries
���������� 20. All 125 V, 1φ, 15 A and 20 A receptacles installed in the locations specified below shall have GFCI protection for personnel except ___. A. garages and sinks B. finished basements and outdoor areas C. crawl spaces and boathouses D. bathtubs and shower areas
Chapter 7 — Printreading Applications 261
���������� 21. The ampacity for copper and aluminum service entrance cable installed in the earth is located in ___ of the NEC®. A. Article 310.15 C. Table 310.15(B)(3)(a) B. Table 310.15(B)(2)(b) D. Table 310.15(B)(16)
���������� 22. A 125 V, ___ A laundry branch circuit is required in dwelling units. A. 15 C. 30 B. 20 D. none of the above
���������� T F 23. A 125 V, 15 A or 20 A receptacle is permitted on a 20 A branch circuit. ����������
���������� 24. Match the equipment to the location.
��������� 1. PP-5
A. Utility pole
��������� 2. PP-1
B. Concrete pad
��������� 3. PP-3
C. Two-car garage
��������� 4. PP-2
D. First floor of main house
��������� 5. Transformer
E. Exterior wall of main house
��������� 6. Generator
F. Basement of main house
��������� 7. Utility meter
G. Train depot
262 NEC® PRINTREADING
Printreading Test 3 Name
Refer to the Woodland Residence plans to answer the following questions.
1. The electrical contractor is responsible for all on-site verification of dimensions and conditions.
2. There are combination smoke/CO detectors in the main house, and they shall activate all alarms, be wired for primary power, and be battery operated for secondary power. A. six C. ten B. eight D. twelve
3. The outdoor pond pump is cord-and-plug connected and shall be protected by a(n) device. A. AFCI C. LCDI B. GFCI D. HDCI
4. heat detector(s) is/are required in each garage. A. One C. Three B. Two D. Four
5. A sump pump located in the unfinished portion of the basement is required to be AFCI protected.
6. At least 120 V, 20 A branch circuit(s) is/are required to supply receptacle outlets in attached garages. A. zero C. two B. one D. four T
7. The NEC® requires at least one lighting outlet in accessible attic spaces used for storage.
8. weatherproof GFCI receptacles are located on the exterior of the main house. A. Eight C. Fifteen B. Ten D. Seventeen
9. Panel PP-5 provides several circuits for receptacles. The requirements for accessory building outlets are located in of the NEC®. A. 210.52(A) C. 210.52(G)(2) B. 210.52(E) D. 210.60(B)
10. The electric service equipment is located in the basement utility room. The 400 A main service disconnect switch is rated at K AIC. A. 10 C. 25 B. 15 D. 100
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���������� 11. Working space is required around electrical service equipment. The minimum clear distance working space for the 400 A, 120/240 V equipment in the utility room is ___″. A. 24 C. 42 B. 36 D. 48
���������� 12. The artist studio GFCI receptacles are shown on sheet GE-1, and the branch circuit bathroom requirements are found in section ___ of the NEC®. A. 210.8 C. 210.11(C)(3) B. 210.10 D. 210.19
���������� 13. Three duplex receptacles in the studio garage ___ the NEC® minimum requirements for each vehicle bay. A. violate C. both A and B B. exceed D. none of the above
���������� 14. Fire-stopping is required when making penetrations between floor levels to install electrical wiring. These holes must be filled with ___. A. wood C. fire-stopping caulk B. metal D. all of the above
���������� 15. ___ switched outlet(s) is/are located in Bedroom #3. A. Zero C. Two B. One D. Three
���������� 16. The second floor loft lighting is switched from ___ location(s). A. one C. three B. two D. four
���������� 17. The finished basement suspended ceiling area includes ___ recessed lighting fixtures. A. 25 C. 40 B. 35 D. 42
���������� 18. Forty 75 W incandescent lamps have a total of ___W. A. 1000 C. 3000 B. 2000 D. 4000
���������� 19. ___ 120 V, 15 A circuit(s) is/are required for a 3000 W general lighting load. A. One C. Three B. Two D. Four
���������� 20. Per the NEC®, ___ wiring methods are permitted when installing underground service conductors. A. five C. eight B. six D. ten
���������� 21. There are ___ acceptable wiring methods for installing service-entrance conductors. A. five C. fifteen B. twelve D. nineteen
���������� 22. The outside feeder disconnecting means supplying the studio garage terminates in PP-3. The location requirements are listed in ___ of the NEC®. A. 225.32 C. 230.71(A) B. 230.70(A) D. 230.91
Chapter 7 — Printreading Applications 265
���������� T F 23. A Z\zn″ thick steel plate is required in all areas where EMT is installed in bored holes of wood studs. ����������
���������� 24. A double wood stud may be bored to a diameter not exceeding ___% of its width. A. 25 C. 50 B. 40 D. 60
���������� 25. The minimum number of small appliance branch circuits for large kitchens that include an island and peninsula countertop is ___. A. two C. four B. three D. five
���������� 26. The train depot has nine receptacle circuits that can be installed as multiwire branch circuits provided each multiwire branch circuit is provided with means to ___ disconnect all ungrounded conductors where the circuits originate. A. simultaneously C. independently B. immediately D. coincidently
���������� T F 27. Garage door opener receptacles mounted in the ceiling require a GFCI device whether or not they are readily accessible. ����������
���������� 28. The minimum size copper branch circuit specified is ___ AWG. A. 12 C. 8 B. 10 D. 6
���������� 29. Four columns in the finished basement include duplex receptacles. The word that best describes these receptacles is ___. A. necessary C. optional B. required D. none of the above
���������� T F 30. Recessed can light fixtures are included in the fixture allowance. ���������� T F 31. The receptacles supplying the garage door openers in the garages are required to be GFCI protected. ����������
���������� 32. Section ___ of the NEC® allows feed-through conductors in panel PP-4. A. 312.8(A) C. 404.3(A) B. 314.17(A) D. 408.36(A)
���������� 33. All garage heat detectors must meet UL Standard ___. A. 215 C. 217 B. 216 D. 218
���������� T F 34. Per the NEC®, the area in the main house adjacent to the workroom will require an additional receptacle outlet. ����������
���������� 35. The electrical installation for the elevator in the main house must meet the requirements of NEC® Article ___. A. 610 C. 625 B. 620 D. 630
266 NEC® PRINTREADING
Printreading Test 4 Name
Refer to the Woodland Residence plans to answer the following questions.
1. The feeder conductors supplying the train depot have been increased in size to compensate for voltage drop. Therefore, the equipment grounding conductor is required to be a minimum AWG copper conductor. A. 10 C. 6 B. 8 D. 4
2. If the train depot is operating at the maximum calculated full load, the percentage of voltage drop for the 240 V feeder is %. Note: K = 12.5. A. 1.3 C. 2.7 B. 1.5 D. 2.9
3. 120 V, 20 A branch circuit(s) is/are required by the NEC速 to supply the bathroom receptacles in the main house. A. One C. Three B. Two D. Four
4. Section of the NEC速 states that compliance with NEC速 requirements may not necessarily be adequate for good service. A. 90.1(A) C. 90.2(B) B. 90.1(B) D. 90.5(A)
5. The authority having jurisdiction (AHJ) may dispute the service disconnect as shown on Sheet OL-1 because it is not . A. on the outside of the house B. accessible to the fire department C. capable of being operated remotely D. at the nearest point of entrance of the service conductors
6. The minimum number of pole spaces required for the 400 A distribution panel is . A. 24 C. 42 B. 30 D. 60
7. The cooling is required to be + SEER. A. 10 C. 14 B. 12 D. 16
8. The total number of branch circuits supplying the air conditioning equipment is . A. zero C. two B. one D. three
268 NEC® PRINTREADING
���������� 9. All the panelboards are supplied from PP-1 and include an equipment grounding conductor run with the feeder conductors. The neutral (grounded) conductor in the panelboard must be ___. A. connected to the equipment grounding conductor and all non-current carrying metal parts B. isolated from the equipment grounding conductor and all non-current carrying metal parts C. connected to a grounding electrode by means of a grounding electrode conductor D. connected to the grounding electrode and equipment grounding conductor by means of the main bonding jumper
���������� 10. Per the NEC®, the underground service conduits must have a minimum of ___″ of cover when passing under the driveway. A. 12 C. 24 B. 18 D. 30
���������� T F 11. The service conduits follow the project specifications. ����������
���������� 12. Per the NEC®, at least ___ receptacle outlet(s) is/are required to be installed in each vehicle space in the garage. A. one C. three B. two D. four
���������� T F 13. Per the NEC®, all receptacles in the garage, including the workshop, shall be GFCI protected. ����������
���������� 14. There are ___ 220 V, 15 A outlets in the garage workshop. A. two C. four B. three D. five
���������� T F 15. The grounding electrode conductor to the domestic metallic cold water service pipe is sized properly per the NEC® as shown on the drawings. ����������
���������� 16. Two 75 gal., glass-lined, high-efficiency, ___ water heaters with 10-year warranties will be provided. A. natural gas C. electric B. propane D. geothermal
���������� 17. Branch circuits ___ supply the water heater circulating pumps. A. 1 and 3 C. 5 and 7 B. 2 and 4 D. none of the above
���������� 18. A ___ may be required where a raceway or sleeve penetrates the wall of the wine cellar. A. hammer drill C. grommet B. seal D. bushing
���������� 19. The information for the integrated cabinet outlets and lighting can be obtained from the ___. A. site plan C. kitchen drawings B. electrical engineer D. specifications
Chapter 7 — Printreading Applications 269
���������� T F 20. Per the drawings, a 240 V, 30 A receptacle is required in the laundry room. ���������� T F 21. Additional receptacle outlets will be required in the great room per the NEC®. ����������
���������� 22. A circuit for a pond pump is indicated on the drawings. The installation of electrical wiring for and the equipment in and adjacent to the pond would be required to follow NEC® Article ___. A. 680 C. 685 B. 682 D. 690
���������� 23. The ground rod, metallic cold water service pipe, and reinforcing rod located in the foundation of the main house are all considered ___. A. grounding devices C. grounding electrodes B. grounding terminals D. grounding paths
���������� 24. The foyer receptacle requirements are located in Section ___ of the NEC®. A. 210.24 C. 210.63 B. 210.52(I) D. 210.70(A)(2)
���������� 25. The decorative light provided by the owner at the front entrance to the main house shall be ___. A. LED C. listed B. glass D. enclosed
���������� 26. The ___ contractor is responsible for coordinating the placement of all sleeves in concrete walls used for electrical penetrations. A. electrical C. waterproofing B. general D. concrete
���������� 27. Section ___ of the NEC® covers the requirements for allowing conductors to feed through a circuit breaker enclosure. A. 312.8(A) C. 408.50 B. 314.17 D. 409.21(A)
���������� 28. The electrical contractor is to provide ___ lighting control per the owner’s specification. A. Intermatic C. Lutron B. Panasonic D. Siemens
���������� T F 29. All interior, exterior, and landscape lighting is controlled by the lighting control system per the owner’s specification. ���������� T F 30. Per the NEC®, the Artist Studio is considered a dwelling unit.
270 NEC® PRINTREADING
Published on May 17, 2017
Printreading has been updated to reflect changes in the NEC® and incorporates fundamental printreading skills and relevant NEC® topics. Prin...