Installation of electric motors

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 5. Electric power plants

Electric motors and their switching devices. Installation of electric motors

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

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5.3.23. Electric motors must be selected and installed in such a way that the possibility of water, oil, emulsion, etc. getting on their windings and current collectors is excluded, and the vibration of equipment, foundations and parts of the building does not exceed permissible values.

5.3.24. The noise generated by the electric motor together with the mechanism driven by it should not exceed the level allowed by sanitary standards.

5.3.25. Maintenance passages between foundations or cases of electric motors, between electric motors and parts of a building or equipment must be at least those specified in Ch. 5.1.

5.3.26. Electric motors and devices, with the exception of those with a degree of protection of at least IP44, and resistors and rheostats - of all versions must be installed at a distance of at least 1 m from building structures made of combustible materials.

5.3.27. Synchronous electrical machines with a power of 1 MW or more and DC machines with a power of 1 MW or more must be electrically isolated from one of the bearings from the foundation plate to prevent the formation of a closed current circuit through the shaft and bearings of the machine. In this case, for synchronous machines, the bearing on the exciter side and all the exciter bearings must be insulated. The oil lines of these electrical machines must be isolated from their bearing housings.

5.3.28. Electric motors above 1 kV are allowed to be installed directly in industrial premises, observing the following conditions:

1. Electric motors with outlets under the stator or requiring special devices for cooling should be installed on a foundation with a chamber (foundation pit).

2. The foundation pit of the electric motor must meet the requirements for switchgear chambers above 1 kV (see Ch. 4.2).

3. The dimensions of the foundation pit should not be less than those allowed for semi-passage cable tunnels (see 2.3.125).

5.3.29. Cables and wires connected to electric motors installed on vibration-isolating bases, in the area between the movable and fixed parts of the base, must have flexible copper conductors.

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

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