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BSI BS IEC 60853-3:2002

Calculation of the cyclic and emergency current rating of cables -- Cyclic rating factor for cables of all voltages, with partial drying of the soil
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BSI BS IEC 60853-3:2002

Calculation of the cyclic and emergency current rating of cables -- Cyclic rating factor for cables of all voltages, with partial drying of the soil

PUBLISH DATE 2002
PAGES 18
BSI BS IEC 60853-3:2002

This part of IEC 60853 gives a method for calculating the cyclic rating factor, for cables of all voltages, where partial drying out of the surrounding soil is anticipated. The method is based on one of the three methods published in a CIGRE1 document. The method is applicable to any type of cable, but it is recommended that it should be applied only to installations of one multi-core cable or to three single-core cables or to groups of circuits where the intercircuit spacing is sufficient to permit free vertical movement of soil moisture between the zones of dry soil associated with each circuit. This standard does not preclude the use of other methods of calculation where full details of the load cycle are not known.

The method assumes that the entire region surrounding a cable or cables has uniform thermal characteristics prior to drying out; the only non-uniformity being that caused by drying. As a consequence the method should not be applied, without further consideration, to installations where special backfills, having properties different from the site soil, are used.

SDO BSI: British Standards Institution
Document Number IEC 60853-3
Publication Date Sept. 23, 2002
Language en - English
Page Count 18
Revision Level
Supercedes
Committee GEL/20/16
Publish Date Document Id Type View
Sept. 23, 2002 BS IEC 60853-3:2002 Revision