Section 1 General Rules

Grounding and protective measures for electrical safety. Electrical installations of premises for keeping animals

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

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1.7.170. The power supply of electrical installations of livestock buildings should, as a rule, be carried out from a mains voltage of 380/220 V AC.

1.7.171. In order to protect people and animals from indirect contact, automatic power off must be carried out using the TN-CS system. Separation of the PEN conductor into zero protective (PE) and zero working (N) conductors should be carried out on the input shield. When supplying such electrical installations from built-in and attached substations, the TN-S system must be used, while the zero working conductor must have insulation equivalent to that of the phase conductors throughout its entire length.

The time of protective automatic power off in the premises for keeping animals, as well as in the premises connected with them with the help of third-party conductive parts, must comply with Table. 1.7.11.

If the specified tripping time cannot be guaranteed, additional protective measures are required, such as additional potential equalization.

Table 1.7.11. Longest allowable protective shutdown time for a TN system in animal housing

1.7.172. The PEN conductor at the entrance to the room must be re-grounded. The value of the re-grounding resistance must comply with 1.7.103.

1.7.173. In premises for keeping animals, it is necessary to provide protection not only for people, but also for animals, for which an additional potential equalization system must be made, connecting all open and third-party conductive parts accessible to simultaneous contact (water pipes, vacuum pipes, metal fences of stalls, metal ties and etc.).

1.7.174. Potential equalization must be carried out in the area where animals are placed in the floor using a metal mesh or other device, which must be connected to an additional potential equalization system.

1.7.175. The device for equalizing and equalizing electrical potentials must provide a contact voltage of not more than 0,2 V in the normal mode of operation of the electrical equipment, and in emergency mode with a shutdown time greater than that indicated in Table. 1.7.11 for electrical installations in rooms with increased danger, especially dangerous and in outdoor installations - no more than 12 V.

1.7.176. For all group circuits supplying socket outlets, there must be additional protection against direct contact using an RCD with a rated residual breaking current of not more than 30 mA.

1.7.177. In livestock buildings, in which there are no conditions that require potential equalization, protection must be performed using an RCD with a rated differential breaking current of at least 100 mA, installed on the input shield.

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

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