Exposed electrical wiring inside the premises. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Exposed electrical wiring inside the premises. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electric installation work

If unprotected insulated wires intersect with unprotected or protected wires with a distance between them of less than 1 cm, then in such places additional insulation must be applied to each unprotected wire, for example, a PVC tube is put on.

When crossing unprotected and protected wires and cables with pipelines, the distances between them must be at least 5 cm, and with pipelines containing flammable or flammable liquids and gases, at least 10 cm. If the distance from wires and cables to pipelines is less than 25 cm, the first should be additionally protected from mechanical damage in sections of at least 25 cm in each direction from the pipeline. When crossing hot pipelines, wires and cables should be protected from high temperatures or appropriate wires should be used. When laying in parallel, the distance from wires and cables to pipelines must be at least 10 cm, and to pipelines with flammable or flammable liquids and gases - at least 40 cm. Wires and cables laid parallel to hot pipelines should be protected from high temperatures or used wires that match the conditions.

In places where wires and cables pass through walls, interfloor floors or in places where wires exit to the outside, it is necessary to provide the possibility of changing the wiring. To do this, the passage should be carried out in a pipe, duct, opening. In order to prevent the penetration and accumulation of water and the spread of fire in places where wires pass through walls, ceilings or when they go outside, it is necessary to seal the gaps between wires, cables and a pipe (duct, opening) with an easily removable mass of fireproof material. The seal must allow replacement, additional laying of new wires and cables, ensure the fire resistance of the opening is not less than the fire resistance of the wall or ceiling.

When laying unprotected electrical wires on insulating supports (insulators, rollers, etc.), the wires should be additionally insulated, for example, they can be laid in an insulating pipe at passages through walls or ceilings. When laying wires from one dry or damp room to another dry or damp room, all wires of one line can be laid in one insulating pipe. When laying electrical wires from a dry or damp room to a damp one, from a damp room to another damp one, or when electrical wires exit the room to the outside, each wire should be laid in a separate insulating pipe. In this case, the process of connecting wires should be carried out only in a dry or only in a humid room.

When laying electrical wires in dry, dust-free rooms, it is allowed to connect electrical wiring pipes, ducts and flexible metal wires without sealing. Connections of steel pipes of electrical wiring and ducts used as grounding or zero protective conductors should be made in accordance with the requirements provided for by the "Electrical Installation Rules" (PUE).

Hidden electrical wiring laid in pipes, ducts, flexible metal hoses should always be made with a seal. The box of hidden electrical wiring must be deaf.

It is unacceptable to lay electrical wiring in ventilation ducts and mines. If the electrical wiring crosses ventilation ducts, then at the intersection, single wires and cables should be laid in steel pipes.

Author: Korshevr N.G.

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