Peat electrical installations. grounding

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

Peat electrical installations. grounding

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

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7.7.39. The resistance of the grounding device R, Ohm, of mobile peat electrical installations above 1 to 10 kV, connected to electrical networks with isolated neutral, must be

R ≤ 40/I

where I is the current of a single-phase earth fault, A.

7.7.40. The grounding resistance of peat electrical installations up to 1 kV connected to networks with an isolated neutral must be no more than 30 ohms.

7.7.41. Grounding of mobile and self-propelled machines is carried out by portable grounding switches installed directly at the machines, or through the grounding core of the supply cable, connected to the portable grounding switches at the overhead line support or to the substation grounding switches.

7.7.42. As portable ground electrodes, it is recommended to use rod electrodes with a length of at least 2,5 m, immersed vertically in deposits to a depth of at least 2 m. The number of electrodes should be at least three.

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

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