Illuminated advertising, signs and illumination

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

Illuminated advertising, signs and illumination

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

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6.4.1. To power the gas-light tubes, dry transformers in a metal casing with a secondary voltage of not more than 15 kV should be used. Transformers must withstand long-term operation in the event of a short circuit in the secondary winding circuit.

Open current-carrying parts of openly installed transformers must be removed from combustible materials and structures by at least 50 mm.

6.4.2. Transformers for supplying gas-light tubes should be installed as close as possible to the tubes fed by them in places inaccessible to unauthorized persons, or in metal boxes designed in such a way that when the box is opened, the transformer is disconnected from the primary voltage side. It is recommended to use these boxes as a structural part of the transformers themselves.

6.4.3. In a common box with a transformer, it is allowed to install blocking and compensating devices, as well as primary voltage devices, provided that the transformer is reliably automatically disconnected from the network using a blocking device that operates when the box is opened.

6.4.4. Storefronts and similar showcases, in which high-voltage parts of gas lighting installations are mounted, must be equipped with a lock that acts only to turn off the installation from the primary voltage side when the displaycases are opened, i.e. the power supply to the installation must be carried out manually by the personnel with the showcase closed.

6.4.5. All parts of the gas lighting installation located outside the showcases equipped with interlocks must be at a height of at least 3 m above ground level and at least 0,5 m above the surface of service platforms, roofs and other building structures.

6.4.6. Accessible to unauthorized persons and energized parts of the gas lighting installation must be fenced in accordance with Ch. 4.2 and are provided with warning posters.

6.4.7. Open current-carrying parts of gas-light tubes must be separated from metal structures or parts of the building at a distance of at least 20 mm, and insulated parts - at least 10 mm.

6.4.8. The distance between open current-carrying parts of gas-light tubes that are not under the same potential must be at least 50 mm.

6.4.9. The open conductive parts of the gas-light installation on the higher voltage side, as well as one of the terminals or the middle point of the secondary winding of the transformers supplying the gas-light tubes, must be grounded.

6.4.10. Transformers or a group of transformers supplying gas-light tubes must be disconnected from the primary voltage side in all poles by a device with a visible break, and also protected by a device designed for the rated current of the transformer.

To disconnect transformers, it is allowed to use package switches with a fixed position of the handle (head).

6.4.11. The electrodes of the gas-light tubes at the points of connection of the wires should not experience tension.

6.4.12. The network on the high voltage side of advertising lighting installations must be made with insulated wires having a test voltage of at least 15 kV. In places accessible to mechanical impact or touch, these wires should be laid in steel pipes, boxes and other mechanically strong non-combustible structures.

For jumpers between individual electrodes, having a length of not more than 0,4 m, it is allowed to use bare wires, provided that the distances given in clause 6.4.7 are observed.

6.4.13. Advertising installations on streets, roads and squares, matching in shape and color with the shape and color of traffic lights, should be placed at a height of at least 8 m from the road surface.

6.4.14. In pedestrian tunnels with a length of more than 80 m or with branches, light indicators of the direction of movement must be placed on walls or columns at a height of at least 1,8 m from the floor.

6.4.15. Light indicators, luminous road signs, lamps for illuminating road signs and lamps for illuminating stair descents and exit zones of pedestrian tunnels must be connected to the phases of the night mode of outdoor lighting (exception p. 6.4.17).

Information light boards and direction indicators for pedestrians in pedestrian tunnels must be turned on around the clock.

6.4.16. The supply of light indicators for the location of fire water sources (hydrants, reservoirs, etc.) should be carried out from the phases of the night mode of the outdoor lighting network or from the network of nearby buildings.

6.4.17. Connection to the lighting networks of streets, roads and squares of license plates of buildings and shop windows is not allowed (see clause 7.1.20).

6.4.18. Installations of illuminated advertising, architectural lighting of buildings should, as a rule, be fed through independent lines - distribution or from the network of buildings. The allowable power of these installations is not more than 2 kW per phase in the presence of a network power reserve.

The line must be protected against overcurrent and leakage currents (RCD).

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

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