Grounding and protective measures for electrical safety. Combined zero protective and zero working conductors (PEN-conductors)

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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. Combined zero protective and zero working conductors (PEN-conductors)

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

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1.7.131. In multi-phase circuits in the TN system for fixedly laid cables, the cores of which have a cross-sectional area of at least 10 mm2 for copper or 16 mm2 for aluminum, the functions of zero protective (PE) and zero working (N) conductors can be combined in one conductor (PEN -conductor).

1.7.132. It is not allowed to combine the functions of the zero protective and zero working conductors in single-phase and direct current circuits. A separate third conductor must be provided as a zero protective conductor in such circuits. This requirement does not apply to branches from overhead lines with voltage up to 1 kV to single-phase consumers of electricity.

1.7.133. It is not allowed to use third-party conductive parts as the only PEN conductor.

This requirement does not exclude the use of open and third-party conductive parts as an additional PEN conductor when connecting them to a potential equalization system.

1.7.134. Specially provided PEN conductors must comply with the requirements of 1.7.126 for the cross section of protective conductors, as well as the requirements of Ch. 2.1 to the zero working conductor.

The insulation of the PEN conductors must be equivalent to that of the phase conductors. It is not necessary to insulate the PEN busbar of the busbars of low-voltage complete devices.

1.7.135. When the zero working and zero protective conductors are separated starting from any point of the electrical installation, it is not allowed to combine them beyond this point along the course of energy distribution. In the place where the PEN conductor is divided into zero protective and zero working conductors, it is necessary to provide separate clamps or busbars for conductors connected to each other. The PEN conductor of the supply line must be connected to the terminal or busbar of the neutral protective PE conductor.

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

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