Crane electrical equipment. Selection and laying of wires and cables

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

Crane electrical equipment. Selection and laying of wires and cables

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

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5.4.41. The selection and laying of wires and cables used on cranes must be carried out in accordance with the requirements of Ch. 2.1, 2.3 and this chapter.

5.4.42. It is recommended to lay wires on taps on trays, in boxes and pipes.

5.4.43. On cranes of all types, wires and cables with copper, aluminum-copper or aluminum conductors can be used.

The cross section of wires and cables of secondary circuits must be at least 2,5 mm2 for copper conductors and at least 4 mm2 for aluminum-copper and aluminum conductors. It is allowed to use wires with stranded conductors with a cross section of at least 1,5 mm2 for copper conductors and at least 2,5 mm2 for aluminum-copper and aluminum conductors, while the wires must not bear mechanical load (see 5.4.44).

For cranes operating in heavy and very heavy duty, as well as for cranes working with mineral fertilizers, it is recommended to use wires and cables with copper conductors for secondary circuits.

For secondary circuits with voltage up to 60 V, it is allowed to use wires and cables with copper stranded conductors with a cross section of at least 0,5 mm2, provided that the conductors are connected by soldering and the wires do not bear mechanical load.

Secondary circuits on cranes working with liquid and hot metal (pouring, filling and filling valves, heating well valves, etc.) must be carried out with wires and cables with copper conductors, and secondary circuits on high-speed cranes (cleaning cranes, reloaders) - with copper or aluminum-copper conductors (see also 5.4.46).

Aluminum and aluminum-copper conductors of wires and cables in the primary circuits of cranes must be multi-wire with a cross section of at least 16 mm2. The use of wires and cables with single-wire aluminum and aluminum-copper conductors in the primary circuits of cranes is not allowed.

5.4.44. On electric hoists operating both separately and as part of other hoisting machines, it is allowed to use protected wires with copper conductors with a cross section: in the secondary circuits and circuits of the brake electromagnet, at least 0,75 mm2, in electric motor circuits, at least 1,5 mm2; in addition, in rocked cases, it is allowed to use protected multi-wire wires with aluminum conductors with a cross section of 2,5 mm2.

5.4.45. The laying of wires and cables on cranes working with liquid and hot metal must be carried out in steel pipes. On these cranes, it is not allowed to lay power circuits of different mechanisms, control circuits of different mechanisms, power circuits and control circuits of one mechanism in one pipe.

5.4.46. On cranes working with liquid and hot metal, heat-resistant wires and cables must be used. The current loads on them should be determined based on the ambient temperature of 60ºС.

5.4.47. In places where the insulation and sheath of wires and cables can be exposed to oil, wires and cables with oil-resistant insulation and sheath should be used. In these places, it is allowed to use wires and cables with non-oil-resistant insulation and sheath, provided that they are laid in pipes with sealed entries to electric motors, apparatus, etc.

5.4.48. Permissible continuous loads on wires and cables must be determined and in accordance with Ch. 1.3.

5.4.49. The voltage at the terminals of the electric motors and in the control circuits for them in all modes of operation of the electrical equipment of the crane must be at least 85% of the nominal voltage.

5.4.50. The cores of wires and cables of all circuits must be marked.

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

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