Through Wiring

LIGMAN TRAINING THROUGH WIRING

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THROUGH WIRING

Through wiring

Single cable entry

• Through wiring helps onsite installers to easily wire luminaires in a circuit • Good for constant current and constant Voltage circuits • Avoids a separate junction box, reduces time and saves cost • Can be used with remote gear, integral gear and without gear

SINGLE VS. THROUGH WIRING

• On a single phase circuit, where the luminaires are in a line (on a gantry, wall etc), through wiring is best

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• On a single phase circuit where the luminaires are grouped together, a junction box makes sense

TRIPLE PHASE CIRCUITS • Triple phase AC circuits are typically found in street and area lighting.

• Triple phase is comprised of 4/5 cables : live cables at 400V difference to eachother, a Neutral cable which is 220V difference between each of the live, and an earth cable.

• Triple phase cables are traditionally thicker than single phase cables.

• Triple phase can be used with single phase luminaires: one live is used with the neutral and earth.

• In this case, a junction box is typically used because of the need to separate the cables and the conductor diameters.

• Therefore single cable entry is used a lot on street and area lighting.

EXAMPLES OF 3 PHASE TO SINGLE PHASE USAGE R Y B N

Three phase motor

Power socket

CFL lamp

Fan

To lighting circuit To lighting circuit

Three phase fuse board

Three phase power sub-meter

To lighting circuit

Single phase fuse board

Single phase power sub-meter Phase 1

Busbar chamber

Phase 2 Phase 3 Neutral 3

EXAMPLES OF 3 PHASE TO SINGLE PHASE USAGE

Class II luminaires with high pressure sodium lamps 230V 70/100/150/250 W Steel-pole

Meter kWh LV Utility line

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GFCI protection

Single phase 2x2.5 mm2 branch circuit

natural grounding of steel-pole Three-phase 5x25mm2 feeder wiring

grounding conductor neutral conductor phase 1 conductor phase 2 conductor phase 3 conductor

Ground electrode naked copper cord

“

The path of

Light

is the quest for knowledge.

Lailah Gifty Akita

”

www.ligman.com