Wiring in the attic. Scheme, description

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

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electric installation work

В attic spaces the following types of wiring can be used: open, wires, cables in pipes, protected wires, cables in sheaths made of non-combustible or slow-burning materials. Such types of wiring are performed at any height from the floor surface.

Electrical wiring can be made with unprotected wires on rollers or insulators at a height of at least 2,5 m from the floor. If the height to the wires is less than 2,5 m, they should be protected from touching them and from mechanical damage.

Electrical wiring can be made hidden in walls and ceilings made of non-combustible materials at any height from the floor.

Open wiring in attics should be made with wires and cables with copper conductors.

Wires with aluminum conductors may be used in cases where attic spaces have fireproof ceilings. Wires are laid openly in steel pipes or hidden in fireproof walls and ceilings.

Connections and branches of electrical wiring in the attic should be made in metal junction or junction boxes. Connections and branches of wires are made by welding, crimping or using clamps. Branches from electrical wiring laid in the attic to electrical receivers installed outside the attic are allowed provided that the wires and branches are laid openly in steel pipes or hidden in fireproof walls and ceilings.

Automatic switches, knife switches, switches in the circuits of lamps and other electrical receivers installed in attic rooms should be equipped outside these rooms.

Author: Korshevr N.G.

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