Wiring in the attic

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 2. Sewerage of electricity

Wiring. Wiring in the attic

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

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2.1.69. The following types of electrical wiring can be used in attic rooms:

open;
wires and cables laid in pipes, as well as protected wires and cables in sheaths made of fireproof or slow-burning materials - at any height;
unprotected insulated single-core wires on rollers or insulators (in the attic of industrial buildings - only on insulators) - at a height of at least 2,5 m; if the height to the wires is less than 2,5 m, they must be protected from touch and mechanical damage;
hidden: in walls and ceilings made of fireproof materials - at any height.

2.1.70. Open electrical wiring in the attic should be carried out with wires and cables with copper conductors.

Wires and cables with aluminum conductors are allowed in attic spaces: buildings with fireproof ceilings - when they are laid open in steel pipes or hidden in fireproof walls and ceilings; industrial buildings for agricultural purposes with combustible ceilings - when they are laid open in steel pipes with the exception of dust penetration into the pipes and junction (branch) boxes; threaded connections must be used.

2.1.71. The connection and branching of copper or aluminum cores of wires and cables in attic spaces should be carried out in metal junction (branch) boxes by welding, crimping or using clamps corresponding to the material, cross section and number of cores.

2.1.72. Electrical wiring in attic spaces made using steel pipes must also meet the requirements given in 2.1.63-2.1.65.

2.1.73. Branches from lines laid in the attic to electrical receivers installed outside the attics are allowed provided that the lines and branches are laid openly in steel pipes or hidden in fireproof walls (ceilings).

2.1.74. Switching devices in the circuits of lamps and other electrical receivers installed directly in attic spaces must be installed outside these premises.

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

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