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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 4. Switchgears and substations

Switchgear with voltage up to 1 kV AC and up to 1,5 kV DC. Tires, wires, cables

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

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4.1.15. Exposed current-carrying parts, as a rule, must have an insulating coating. Between fixedly fixed current-carrying parts of different polarity, as well as between them and open conductive parts, distances of at least 20 mm along the insulation surface and at least 12 mm in air must be provided. From non-insulated current-carrying parts to fences, distances of at least 100 mm for mesh and 40 mm for solid removable fences must be provided.

4.1.16. Within panels, shields and cabinets installed in dry rooms, insulated wires with insulation rated for a voltage of at least 660 V can be laid on metal surfaces protected from corrosion close to one another. In these cases, for power circuits, the reducing factors for current loads given in Ch. 2.1.

4.1.17. Protective (PE) conductors and busbars can be laid without insulation. Zero working (N) conductors, busbars and combined (PEN) conductors are laid with insulation.

4.1.18. Electrical wiring of control circuits, measurements and others must comply with the requirements of Ch. 3.4. Cable laying must comply with Ch. 2.3. Cable passages both from below and from above, inside panels, cabinets, etc. must be carried out through sealing devices that prevent the ingress of dust, moisture, foreign objects, etc.

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

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