Installation of devices and devices

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 4. Switchgears and substations

Switchgear with voltage up to 1 kV AC and up to 1,5 kV DC. Installation of devices and devices

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

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4.1.8. Apparatus and instruments should be located so that sparks or electric arcs arising in them during operation could not cause harm to maintenance personnel, ignite or damage surrounding objects, cause short circuits or ground faults.

4.1.9. Chopping devices must be installed so that they cannot close the circuit spontaneously, under the influence of gravity. Their moving current-carrying parts in the disconnected position, as a rule, should not be energized.

4.1.10. Knife switches with direct manual control (without a drive), designed to turn on and off the load current and having contacts facing the operator, must be protected by fireproof shells without holes and slots. These circuit breakers, intended only for stress relief, may be installed openly, provided that they are inaccessible to unqualified personnel.

4.1.11. On the drives of switching devices, the "on" and "off" positions must be clearly indicated.

4.1.12. It must be possible to remove voltage from each circuit breaker during its repair or dismantling. For this purpose, circuit breakers or other disconnecting devices should be installed in the necessary places. A disconnecting device in front of the circuit breaker of each line departing from the switchgear is not required to be provided in electrical installations:

with retractable switches;
with fixed switches, in which during the repair or dismantling of this switch, it is permissible to remove voltage by a common device from a group of switches or from the entire switchgear;
with fixed circuit breakers, if it is possible to safely remove the circuit breakers while energized using an insulated tool.

4.1.13. Threaded (plug) fuses must be installed so that the supply wires are connected to the contact screw, and those leading to the electrical receivers - to the screw sleeve (see Chap. 3.1).

4.1.14. The installation of devices and devices on the switchgear and low-voltage switchgear should be carried out in the area from 400 to 2000 mm from the floor level. It is recommended to place manual operational control devices (switches, buttons) at a height of not more than 1900 mm and not less than 700 mm from the floor level. Measuring devices are recommended to be installed in such a way that the scale of each of the devices is at a height of 1000-1800 mm from the floor.

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

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