Installation of switchgears in electrical rooms

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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. Installation of switchgears in electrical rooms

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

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4.1.23. In electrical rooms (see 1.1.5.), service passages located on the front or rear side of the switchboard must comply with the following requirements:

1) clear passage width must be at least 0,8 m, clear passage height not less than 1,9 m. In some places, the passages may be constrained by protruding building structures, however, the width of the passage in these places must be at least 0,6 m;

2) the distances from the most protruding unenclosed uninsulated current-carrying parts (for example, disconnected knife switches), when they are located on one side at a height of less than 2,2 m, to the opposite wall, fence or equipment that does not have unenclosed uninsulated current-carrying parts, must be at least:

1,0 m - at a voltage below 660 V with a shield length of up to 7 and 1,2 m with a shield length of more than 7 m;
1,5 m - at a voltage of 660 V and above.

The length of the shield in this case is the length of the passage between two rows of a solid front of panels (cabinets) or between one row and the wall;

3) the distances between unshielded non-insulated current-carrying parts and located at a height of less than 2,2 m, with their two-sided arrangement, must be at least:

1,5 m - at a voltage below 660 V;
2,0 m - at a voltage of 660 V and above;

4) non-insulated current-carrying parts located at distances smaller than those given in paragraphs. 2 and 3 must be guarded. In this case, the width of the passage, taking into account the fences, must be at least specified in clause 1;

5) unprotected non-insulated current-carrying parts located above the passages must be located at a height of at least 2,2 m;

6) fences placed horizontally above the walkways must be located at a height of at least 1,9 m;

7) passages for servicing shields with a shield length of more than 7 m must have two exits. Exits from the passage from the mounting side of the switchboard can be made both to the switchboard room and to rooms for other purposes. With a service passage width of more than 3 m and the absence of oil-filled devices, a second exit is optional. Doors from switchgear rooms should open towards other rooms (with the exception of switchgear above 1 kV AC and above 1,5 kV DC) or outward and have self-locking locks unlocked without a key from the inside of the room. Doors must be at least 0,75 m wide and 1,9 m high.

4.1.24. Grids with mesh sizes of not more than 25x25 mm, as well as solid or mixed fences, can serve as a fence for non-insulated current-carrying parts. The height of the fences must be at least 1,7 m.

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

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