Grounding devices of electrical installations with voltage up to 1 kV in networks with isolated neutral

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Grounding and protective measures for electrical safety. Grounding devices of electrical installations with voltage up to 1 kV in networks with isolated neutral

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

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1.7.104. The resistance of the earthing device used for protective earthing of exposed conductive parts in the IT system must comply with the condition:

R ≤ Upr / I

where R is the resistance of the grounding device, Ohm;

Upr - touch voltage, the value of which is assumed to be 50 V (see also 1.7.53);

I - total earth fault current, A.

As a rule, it is not required to accept the resistance value of the grounding device as less than 4 ohms. Grounding device resistance up to 10 Ohm is allowed if the above condition is met, and the power of generators or transformers does not exceed 100 kVA, including the total power of generators or transformers operating in parallel.

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

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