Execution and protection of lighting networks

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 6. Electric lighting

Electric lighting. A common part. Execution and protection of lighting networks

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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6.1.30. Lighting networks must be made in accordance with the requirements of Ch. 2.1, 2.2, 2.3, 2.4, as well as additional requirements given in Ch. 6.2, 6.3, 6.4 and 7.1, 7.2, 7.3, 7.4.

6.1.31. The cross section of zero working conductors of three-phase supply and group lines with fluorescent lamps, DRL, DRI, DRIZ, DNAT, with the simultaneous disconnection of all phase wires of the line, must be selected:

1. For sections of the network through which current flows from lamps with compensated ballasts, equal to phase, regardless of the cross section.

2. For network sections through which current flows from lamps with uncompensated ballasts equal to the phase one with a cross section of phase conductors less than or equal to 16 mm2 for copper and 25 mm2 for aluminum wires and at least 50% of the cross section of phase conductors for large cross sections, but not less than 16 mm2 for copper and 25 mm2 for aluminum wires.

6.1.32. When protecting three-phase lighting supply and group lines with fuses or single-pole circuit breakers for any light source, the cross section of zero working conductors should be taken equal to the cross section of phase conductors.

6.1.33. Protection of lighting networks must be carried out in accordance with the requirements of Sec. 3.1 with the additions given in paragraphs. 6.1.34 - 6.1.35, 6.2.9 - 6.2.11, 6.3.40, 6.4.10.

When choosing the currents of protection devices, starting currents should be taken into account when turning on powerful incandescent lamps and DRL, DRI, DRIZ, DNAT lamps.

Protective devices should be located, if possible, in groups in places accessible for maintenance. Dispersed installation of protective devices is allowed when lighting is powered from busbars (clause 6.2.7).

6.1.34. Protection devices, regardless of the requirements of paragraphs. 6.2.7 and 6.2.8 in the supply lighting network should be installed at the entrances to buildings.

6.1.35. Transformers used to power luminaires up to 50 V must be protected on the higher voltage side. Protection must also be provided for outgoing low voltage lines.

If the transformers are fed in separate groups from the shields and the protection device on the shield serves no more than three transformers, then the installation of additional protection devices on the higher voltage side of each transformer is optional.

6.1.36. Installation of fuses, automatic and non-automatic single-pole switches in zero working wires in networks with grounded neutral is prohibited.

See other articles Section Rules for the installation of electrical installations (PUE).

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