TECHNICAL
Power-Over-Ethernet Lighting Willardo C. Mesa Power-Over-Ethernet (POE) is based on the still evolving IEEE Standard, the 802.3bt (which has 2 most recent types, the Type 3 4PPoE and the Type 4) which states the enhancements using all 4 pairs balanced twisted-pair cabling, lower standby power and specific enhancements to support Internet-ofThings applications (e.g. Lighting, sensors, building automation). Table 1 shows the technical specifications of both the Type 3 and Type 4 PoEs. Some of the applications of PoE (IEEE 802.3bt) include the Building Management (Connected LED lighting), Pan-tilt-zoom (PTZ) CCTV cameras, Kiosks, Point of Sale (POS) terminals, Access points, and Small Cells (InBuilding Signal Enhancement or DAS), etc. Pertaining to PoE Lighting, a basic system includes a Power Sourcing Equipment (PSE), a Powering Device
TIA 568, ANSI-TIA-569, BICSI ITSIMM. These standards specify the various aspect of data wiring, from wiring method, electromagnetic interferences, and best installation practices. The local standard, the Philippine Electronics Code Part 1, was based from the preceding international standards. Relative the practice of lighting design in the Philippines, the applicable law is RA 7920, its Section 2 (j) states…“Utilization equipment” refers to energyconsuming equipment including motors, heaters, furnaces, light sources and other devices which utilize electric energy, for any purpose.” Another local code, the Philippine Green Building Code of 2015 (which is one of the referral codes of the National Building Code). Section 3 “seeks to improve the efficiency of building performance
TABLE I TECHNICAL SPECIFICATIONS OF BOTH THE TYPE 3 AND TYPE 4 POES Parameters Power available at Powering Devices (PD) Maximum Power Delivered by the Power Sourcing Equipment (PSE) Voltage Range (at PSE)
802.3bt Type 3 4PPoE 51 W 60 W 50.0–57.0 V
802.3bt Type 4 71 W 100 W 52.0–57.0 V
Voltage range (at PD) Maximum Current Maximum Cable Resistance
42.5–57.0 V 1200 mA 6.25 Ω
Supported Cabling
Category 5
41.1–57.0 V 1731 mA 6.25 Ω Category 5e (awaiting ratification)
(PD), LED Lighting Fixtures, Dimmers and Sensors. Some Equipment manufacturers also include Wireless Remote Controllers. Complementing the POE devices were the Smart Phones with App serving as remote controller, and PC Applications to control the system remotely within the building or via the Internet. Information from a leading equipment manufacturer include features in which the Sensors will not only sense the natural light to control the lighting devices, but will also sense other parameters such as temperature to control even the airconditioning system via the Building Management System. Cabling-wise, PoE lighting were being installed following international standards such as the ANSI-
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through a framework of acceptable set of standards that will enhance sound environmental and resource management that will counter the harmful gases responsible for the adverse effects of climate change, throughout the building’s life-cycle including efficient use of resources, site selection, planning, design, construction, use, occupancy, operation and maintenance, without significant increase in cost.” With its proven efficiency, the PoE lighting will soon become popular among the new building installations. Its acceptability will depend mainly on the lowered cost of data wire, wherein a 305-meter reel of Cat6 now only costs around P3,000.00. Compared to the conventional wire, whose reel is only 150-meter also costs P3000.00 (which has only an effective length of 50 meters, 2-way plus a ground wire).
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