Insulation of electrical installations. General requirements

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Insulation of electrical installations. General requirements

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

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1.9.7. The choice of insulators or insulating structures made of glass and porcelain should be made according to the specific effective creepage distance depending on C3 at the location of the electrical installation and its rated voltage. The choice of insulators or insulating structures made of glass and porcelain can also be made according to the discharge characteristics in a contaminated and wet state.

The choice of polymer insulators or structures, depending on C3 and the rated voltage of the electrical installation, should be made according to the discharge characteristics in a polluted and wet state.

1.9.8. The determination of C3 should be made depending on the characteristics of pollution sources and the distance from them to the electrical installation (Tables 1.9.3 - 1.9.18). In cases where the use of Table. 1.9.3 - 1.9.18 for one reason or another is impossible, the determination of C3 should be made according to KC3.

Near industrial complexes, as well as in areas with overlapping pollution from large industrial plants, thermal power plants and sources of humidification with high electrical conductivity, the determination of C3, as a rule, should be made according to KC3.

1.9.9. The creepage distance L (cm) of insulators and insulating structures made of glass and porcelain shall be determined by the formula

L = λe U k,

where λe is the specific effective creepage distance according to Table. 1.9.1, cm/kV;

U - the highest operating phase-to-phase voltage, kV (according to GOST 721);

k is the creepage distance utilization factor (1.9.44-1.9.53).

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

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