Electrical installations of residential, public, administrative and household buildings. General requirements. Power supply

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

Electrical installations of residential, public, administrative and household buildings. General requirements. Power supply

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

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7.1.13. The electrical receivers must be powered from a 380/220 V network with a TN-S or TN-CS grounding system.

When reconstructing residential and public buildings with a mains voltage of 220/127 V or 3 x 220 V, it is necessary to provide for the transfer of the network to a voltage of 380/220 V with a TN-S or TN-CS grounding system.

7.1.14. External power supply of buildings must meet the requirements of Chapter 1.2.

7.1.15. In dormitories of various institutions, in schools and other educational institutions, etc. the construction of built-in and attached substations is not allowed.

In residential buildings, in exceptional cases, it is allowed to place built-in and attached substations using dry-type transformers in agreement with the state supervision authorities, while sanitary requirements to limit the level of noise and vibration in accordance with applicable standards must be fully met.

The device and placement of built-in, attached and stand-alone substations must be carried out in accordance with the requirements of the chapters of Sec. 4.

7.1.16. It is recommended to supply power and lighting electrical receivers from the same transformers.

7.1.17. The location and layout of transformer substations should provide for the possibility of round-the-clock unhindered access to them by the personnel of the power supply organization.

7.1.18. The supply of security lighting and evacuation lighting must be carried out in accordance with the requirements of Ch. 6.1 and 6.2, as well as SNiP 23-05-95 "Natural and artificial lighting".

7.1.19. If there are elevators in the building, which are also intended for transporting fire departments, their power must be provided in accordance with the requirements of Ch. 7.4.

7.1.20. The electrical networks of buildings should be designed to supply lighting for advertising, shop windows, facades, illumination, outdoor, fire-fighting devices, dispatching systems, local television networks, light indicators for fire hydrants, safety signs, bells and other alarms, light railing lights, etc., in accordance with the design assignment.

7.1.21. When supplying single-phase consumers of buildings from a multi-phase distribution network, it is allowed for different groups of single-phase consumers to have common N and PE conductors (five-wire network) laid directly from the ASU, combining N and PE conductors (four-wire network with a PEN conductor) is not allowed.

When supplying single-phase consumers from a multi-phase supply network with branches from overhead lines, when the PEN conductor of the overhead line is common for groups of single-phase consumers powered from different phases, it is recommended to provide for a protective shutdown of consumers when the voltage is exceeded above the allowable voltage, which occurs due to load asymmetry in the event of a PEN break conductor. Shutdown should be carried out at the input to the building, for example, by acting on the independent release of the input circuit breaker by means of an overvoltage relay, while both phase (L) and zero working (N) conductors should be disconnected.

When choosing devices and devices installed at the input, preference, ceteris paribus, should be given to devices and devices that remain operational when the voltage exceeds the allowable voltage, arising from load asymmetry when the PEN or N conductor breaks, while their switching and other performance specifications may not be met.

In all cases, in the circuits of PE and PEN conductors, it is forbidden to have switching contact and non-contact elements.

Connections that can be disassembled with a tool are allowed, as well as connectors specially designed for this purpose.

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

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