Electrical installations in hazardous areas. Electric cars

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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 hazardous areas. Electric cars

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

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7.3.66. In explosive zones of any class, electrical machines with a voltage class of up to 10 kV can be used, provided that the level of their explosion protection or the degree of protection of the shell in accordance with GOST 17494-87 correspond to Table. 7.3.10 or higher.

If individual parts of the machine have different levels of explosion protection or degrees of protection of shells, then all of them must not be lower than those indicated in Table. 7.3.10.

7.3.67. For mechanisms installed in explosive zones of classes B-I, B-Ia and B-II, it is allowed to use electric motors without explosion protection under the following conditions:

a) electric motors must be installed outside hazardous areas. The room in which the electric motors are installed must be separated from the explosive zone by a fireproof wall without openings and a fireproof ceiling (coating) with a fire resistance limit of at least 0,75 hours, have an emergency exit and be provided with ventilation with five air changes per hour;

b) the drive of the mechanism should be carried out using a shaft passed through the wall, with a gland seal in it.

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

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