Grounding and protective measures for electrical safety. Connections and connections of grounding, protective conductors and conductors of the potential equalization and equalization system

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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. Connections and connections of grounding, protective conductors and conductors of the potential equalization and equalization system

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

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1.7.139. Connections and connections of grounding, protective conductors and conductors of the equalization and potential equalization system must be reliable and ensure continuity of the electrical circuit. It is recommended to make connections of steel conductors by welding. It is allowed to connect grounding and neutral protective conductors in indoor and outdoor installations without aggressive environments in other ways that meet the requirements of GOST 10434 "Contact electrical connections. General technical requirements" for the 2nd class of connections.

Connections must be protected from corrosion and mechanical damage.

For bolted connections, provisions must be made to prevent contact loosening.

1.7.140. Connections must be accessible for inspection and testing, with the exception of connections filled with compound or sealed, as well as welded, soldered and pressed connections to heating elements in heating systems and their connections located in floors, walls, ceilings and in the ground.

1.7.141. When using devices for monitoring the continuity of the grounding circuit, it is not allowed to connect their coils in series (in a cut) with the protective conductors.

1.7.142. Connections of grounding and neutral protective conductors and potential equalization conductors to open conductive parts must be made using bolted connections or welding.

Connections to equipment that is subject to frequent disassembly or installed on moving parts or parts subject to shock and vibration must be made using flexible conductors.

Connections of protective conductors of electrical wiring and overhead lines should be made using the same methods as connections of phase conductors.

When using natural grounding conductors for grounding electrical installations and third-party conductive parts as protective conductors and potential equalization conductors, contact connections should be made using the methods provided for by GOST 12.1.030 "SSBT. Electrical safety. Protective grounding, grounding."

1.7.143. Places and methods of connecting grounding conductors to extended natural grounding conductors (for example, pipelines) must be selected such that when disconnecting the grounding conductors for repair work, the expected touch voltages and the calculated resistance values of the grounding device do not exceed safe values.

Shunting of water meters, valves, etc. should be carried out using a conductor of the appropriate cross-section, depending on whether it is used as a protective conductor of the potential equalization system, a neutral protective conductor or a protective grounding conductor.

1.7.144. The connection of each open conductive part of the electrical installation to the neutral protective or protective grounding conductor must be made using a separate branch. The series connection of exposed conductive parts into the protective conductor is not permitted.

The connection of conductive parts to the main potential equalization system must also be made using separate branches.

The connection of conductive parts to an additional potential equalization system can be done using either separate branches or connection to one common permanent conductor.

1.7.145. It is not allowed to connect switching devices in circuits of PE and PEN conductors, except when powering electrical receivers using plug connectors.

It is also allowed to simultaneously disconnect all conductors at the input to electrical installations of individual residential, country and garden houses and similar objects fed by single-phase branches from overhead lines. In this case, the division of the PEN conductor into PE and N conductors must be carried out before the input protective switching device.

1.7.146. If the protective conductors and/or potential equalization conductors can be disconnected using the same plug connector as the corresponding phase conductors, the socket and plug of the plug connector must have special protective contacts for connecting the protective conductors or potential equalization conductors to them.

If the body of the socket outlet is made of metal, it must be connected to the protective contact of that socket.

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

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