Crane electrical equipment. Grounding and grounding

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

Crane electrical equipment. Grounding and grounding

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

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5.4.56. Grounding and grounding must be carried out in accordance with the requirements of Sec. 1.7. It is considered sufficient if the parts to be grounded or neutralized are connected to the metal structures of the crane, while the continuity of the electrical circuit of the metal structures must be ensured. If the electrical equipment of the crane is installed on its grounded metal structures and there are cleaned and unpainted places on the supporting surfaces to ensure electrical contact, then additional grounding is not required.

The rails of the crane runway must be securely connected at the joints (by welding, welding of jumpers of sufficient cross section, welding to metal crane beams) to one another to create a continuous electrical circuit. In electrical installations for which grounding or grounding is used as a protective measure, the rails of the crane runway must be grounded or grounded accordingly.

When installing the crane in the open air, the rails of the crane runway, in addition, must be interconnected and grounded, while for grounding the rails it is necessary to provide at least two grounding switches connected to the rails in different places.

5.4.57. When powering the crane with a cable, in addition to the requirement of 5.4.56, the requirements of Ch. 1.7 applicable to mobile electrical installations.

5.4.58. The case of the push-button control device of the crane, controlled from the floor, must be made of insulating material or grounded (grounded) with at least two conductors. As one of the conductors, a cable can be used, on which a push-button device is suspended.

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

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