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Section 7. Electrical equipment of special installations
Peat electrical installations. cable lines
Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)
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7.7.25. When laying cable lines in the ground, their protection from mechanical damage is not required, with the exception of protection at intersections with railways and highways, as well as in places of heavy traffic of peat machines.
7.7.26. For portable cable lines, special flexible cables designed for heavy-duty operation should be used.
7.7.27. The cross sections of flexible cables are selected according to the allowable continuous current and allowable voltage loss.
7.7.28. Portable cable lines up to 10 kV, supplying electricity to machines that move continuously or periodically move during one season, can be laid directly on the surface of the deposit. At the same time, warning posters should be installed near cable lines above 1 kV.
7.7.29. The connection of a flexible cable to a mobile installation must be carried out using a device that relieves the contact clamps from cable tension and provides an acceptable bending radius of the cable.
7.7.30. Connecting a portable cable line to the overhead line should be done using disconnecting devices. The installation height of unprotected current-carrying parts of the disconnecting device from the ground must be at least 5 m for linear devices, 3,5 m for detachable and portable devices. Disconnecting devices must be manufactured according to special specifications.
7.7.31. To connect cable lines to overhead lines up to 1 kV, it is recommended to use circuit breakers and plug-in contact connections installed on overhead line supports at an accessible height. The switch and socket installed on the pole must be placed in a lockable cabinet. Metal parts of the specified equipment, which are not normally energized, must be earthed.
 See other articles Section Rules for the installation of electrical installations (PUE).
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