Electrical installations in fire hazardous areas. Distribution devices, transformer and converter substations

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 7. Electrical equipment of special installations

Electrical installations in fire hazardous areas. Distribution devices, transformer and converter substations

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

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7.4.28. Installation of a switchgear up to 1 kV and higher in fire hazardous areas of any class is not recommended. If it is necessary to install a switchgear in fire hazardous areas, the degree of protection of its elements (cabinets, etc.) must comply with Table. 7.4.2.

7.4.29. In fire hazardous zones of any class, with the exception of fire hazardous zones in warehouses, as well as buildings and premises of archives, museums, art galleries, libraries, it is allowed in areas fenced with nets, open installation of a transformer substation, a checkpoint with dry transformers or non-combustible filling, as well as complete capacitor units (CCU) with non-combustible filling of capacitors. At the same time, the degree of protection of the shell of cabinets for KTP, KPP and KKU must be at least IR41. The distance from the KTP, checkpoint and KKU to the fence is taken in accordance with Ch. 4.2.

In fire hazardous zones of any class, with the exception of fire hazardous zones in warehouses, as well as premises of archives, museums, art galleries, libraries, built-in or attached package transformer substations and checkpoints with oil-filled transformers and substations with oil-filled transformers in closed chambers, constructed in accordance with the requirements of Ch. 4.2 and 7.4.30.

7.4.30. Substations with oil-filled transformers can be built-in or attached¹⁾ under the following conditions:

1. Doors and ventilation openings of oil-filled transformer chambers should not go into fire hazardous areas.

2. Holes in the walls and floor in the places where cables and electrical wiring pipes pass must be tightly sealed with fireproof materials.

3. The exit from the substation with oil-filled transformers installed in the chambers to the fire hazardous zone can only be made from the switchgear room up to 1 kV. In this case, the door must be self-closing and have a fire resistance rating of at least 0,6 hours.

4. Exit from the premises of KTP and KPP to the fire hazardous area, as well as transportation of transformers of KTP and KPP through the fire hazardous zone are allowed. In this case, the door is provided, as indicated in paragraph 3, and the gate - with a fire resistance limit of at least 0,6 hours.

1. Switchgear, TP, PP are considered built-in if they have two or three walls (partitions) in common with adjacent rooms with fire hazardous zones, and attached if they have only one wall (partition) in common with these rooms.

7.4.31. Oil-filled electrical equipment (transformers, capacitor banks, circuit breakers, etc.) can be installed at a distance of at least 0,8 m from the outer wall of a building with fire hazard zones, provided that the horizontal and vertical distance from the openings in the wall of the building to the installed electrical equipment will be at least 4 m.

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

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