Flexible conductors with voltage above 1 kV

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 2. Sewerage of electricity

Conductors with voltage up to 35 kV. Flexible conductors with voltage above 1 kV

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

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2.2.33. Flexible conductors in the open air should be laid on independent supports. Combined laying of current conductors and technological pipelines on common supports is not allowed.

2.2.34. The distance between the wires of the split phase is recommended to be taken equal to at least six diameters of the wires used.

2.2.35. The distance between current-carrying parts and from them to grounded structures, buildings and other structures, as well as to the roadbed or railway should be taken according to Ch. 2.5.

2.2.36. The approach of conductors with buildings and structures containing explosive premises, as well as with explosive outdoor installations, must be carried out in accordance with the requirements of Ch. 7.3.

2.2.37. Checking the distances from current conductors to crossed structures should be carried out taking into account additional weight loads on the wires from phase-to-phase and intra-phase spacers and the possibilities of the maximum temperature of the wire in the post-emergency mode. The maximum temperature during operation of the tokoprorod in the post-emergency mode is assumed to be plus 70ºС.

2.2.38. It is recommended to arrange the phases of the circuit of an extended conductor along the vertices of an equilateral triangle.

2.2.39. The design of a lingering current duct should provide for the possibility of using portable grounding, which allows you to safely perform work on a disconnected circuit.

The number of places for installation of portable grounding is selected according to 2.2.30, clause 3.

2.2.40. When calculating the wires of flexible conductors, it is necessary to be guided by the following:

1. Tension and stress in the wires for various combinations of external loads should be taken depending on the allowable standard tension per phase, due to the strength of the supports used and the nodes that perceive the forces.

The normative tension per phase should be taken, as a rule, not more than 9,8 kN (10 tf).

2. Additional weight loads on the wires from phase-to-phase and intra-phase spacers must be taken into account.

3. Wind pressure on wires shall be calculated according to 2.5.30.

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

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