Installation of electrical wiring in the attic. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Installation of electrical wiring in the attic. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electric installation work

ceiling attic space is the roof of the house. In addition, the attic has load-bearing structures made of combustible materials. Premises, floors and structures of which are made of non-combustible materials, are not considered attic.

Electrical wiring in attics is carried out mainly for laying inputs from overhead lines into the building to the terminals of the apartment shield. In garden houses, attic lighting is not required. Installation of electrical wiring, not counting the laying of inputs, in attics made of combustible materials can be called an emergency.

Attic rooms are subject to temperature fluctuations, they are usually dusty, rarely visited by people, and have an increased fire hazard. Damage to the electrical wiring that accidentally occurred there can lead to a fire in wooden structures, so the installation of attic electrical wiring must be treated with particular care.

Electrical wiring can be used in the attic:

open: wires and cables laid in steel pipes, as well as in shells made of fireproof or slow-burning materials at any height; unprotected insulated single-core wires on rollers or insulators at a height of at least 2,5 m from the floor. At a height of less than 2,5 m, they must be protected from mechanical damage.
The distance between the attachment points of the rollers should be no more than 600 mm, insulators - no more than 1000 mm, between the wires - no less than 50 mm;
hidden - in walls and ceilings made of fireproof materials (at any height).

In attics, open electrical wiring should be carried out with wires and cables with copper conductors. Wires and cables with aluminum conductors can be used in buildings with fireproof floors, provided they are laid in steel pipes or hidden in fireproof walls and ceilings. Transit lines in attics up to 5 m long are also allowed to be made with wires with aluminum conductors.

When laying steel pipes, it is necessary to prevent dust from penetrating inside them and connecting (branch) boxes. For this, sealed threaded connections must be used. Pipe connections using threaded couplings without seals are allowed in dry and dust-free attic spaces. Pipes must be laid with a slope so that moisture cannot accumulate in them, including from the condensation of vapors contained in the air.

Branches to electrical receivers from lines laid in attics are allowed provided that both the line and branches are laid openly in steel pipes, hidden - in fireproof walls and ceilings.

Switching devices in circuits supplying lamps installed directly in attics should be placed outside them, for example, at the entrance to the attic.

Steel pipes, lamp housings and other metal structures of electrical wiring in the attic should be zeroed.

It is forbidden to lay any non-metallic pipes in attics - polyethylene, polypropylene and vinyl plastic.

Author: Bannikov E.A.

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