Execution and protection of outdoor lighting networks

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

Outdoor Lighting. Execution and protection of outdoor 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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6.3.25. Outdoor lighting networks are recommended to be cable or overhead using self-supporting insulated wires. In justified cases, for overhead distribution networks for lighting streets, roads, squares, territories of microdistricts and settlements, it is allowed to use bare wires.

6.3.26. On the poles of the contact network of electrified vehicles with a voltage of up to 600 V DC, it is allowed to lay cable lines to power outdoor lighting fixtures installed on the poles; it is allowed to use self-supporting insulated wires.

6.3.27. Outdoor lighting air lines must be carried out in accordance with the requirements of Ch. 2.4.

Crossings of lines with streets and roads with spans of not more than 40 m are allowed to be performed without the use of anchor supports and double fastening of wires.

6.3.28. Zero conductors of the public network, made with bare wires, when used for outdoor lighting, should be located below the phase wires of the public network and the phase wires of the outdoor lighting network.

When using existing supports belonging to power grid organizations that are not involved in the operation of outdoor lighting, it is allowed to place the phase wires of the outdoor lighting network below the zero conductors of the public network.

6.3.29. In places where cable lines pass to air lines, it is recommended to provide disconnecting devices installed on supports at a height of at least 2,5 m. cable.

6.3.30. In order to reserve distribution cable lines or lines made with self-supporting insulated wires, it is recommended to provide normally disconnected jumpers (backup cable lines) between the extreme lamps of neighboring sections for the main streets of cities.

When using these jumpers, in derogation from clause 6.1.19, the voltage drop at lighting devices can be increased to 10% of the nominal voltage.

6.3.31. Overhead lines for outdoor lighting should be carried out without regard to redundancy, and their wires can be of different sections along the length of the line.

6.3.32. Branches to luminaires from outdoor lighting cable lines are recommended to be performed, as a rule, without cutting the cable cores.

When laying these cable lines on engineering structures, measures should be taken for convenient cutting of branches from the cable to the support and the possibility of replacing the cable with sections.

6.3.33. Cable entry into the poles must be limited to the base of the pole. Plinths must be of sufficient size to accommodate cable terminations and fuses or circuit breakers installed on branches to lighting fixtures, and a door with a lock for maintenance.

It is allowed to use special input boxes mounted on supports.

6.3.34. Electrical wiring inside outdoor lighting poles must be carried out with insulated wires in a protective sheath or cables. Inside the combined outdoor lighting poles and contact networks of electrified urban transport, cables with insulation for a voltage of at least 660 V must be used.

6.3.35. Lines supplying luminaires suspended on cables must be made with cables laid along a cable, self-supporting insulated wires or bare wires laid on insulators, subject to the requirements of Sec. 2.

6.3.36. Cables for suspension of lamps and supply lines of the network may be attached to building structures. In this case, the cables must have shock absorbers.

6.3.37. In outdoor lighting networks that supply lighting devices with discharge lamps, in single-phase circuits, the cross section of zero working conductors must be equal to the phase one.

In three-phase networks, with the simultaneous disconnection of all phase wires of the line, the cross section of the zero working conductors 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 sections of the network 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.

6.3.38. The laying of lines supplying searchlights, lamps and other electrical equipment installed on structures with lightning rods of open switchgears with a voltage above 1 kV should be carried out in accordance with the requirements of Ch. 4.2.

6.3.39. The demand factor when calculating the outdoor lighting network should be taken equal to 1,0.

6.3.40. On outdoor lighting lines with more than 20 luminaires per phase, the branches to each luminaire must be protected by individual fuses or circuit breakers.

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

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