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General requirements for electrical wiring. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electric installation work
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The cross sections of the conductive cores of wires and cables must be at least those given in Table. 1.
Table 1. The value of the cross sections of the conductive cores of wires and cables
Phase and neutral wires should be laid in one common pipe. In separate steel pipes, their laying is permissible if the continuous load current does not exceed 25A.
With hidden electrical wiring, the structural elements of buildings and structures, the voids of which are used for electrical wiring, must be fireproof. Connections, terminations and branches of wires and cables should be made by crimping, welding, soldering or clamping (for a bolt or screw). Twisting the wires is not allowed. Wires should not experience mechanical stress at the points of branches and connections. Connections and branches of wires and cables should be made in junction and junction boxes or in insulating cases of junction and junction clamps. When laying wires and cables on insulating supports (rollers, clips, insulators), the connection or branch must be made directly on these supports. Junction and junction boxes, insulating clamps are made of non-combustible or slow-burning materials.
Author: Korshevr N.G.
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