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  • BSI
    BS 7769-2.2:1997, IEC 60287-2-2:1995 Electric cables. Calculation of the current rating. Thermal resistance - A method for calculating reduction factors for groups of cables in free air, protected from solar radiation
    Edition: 1997
    $318.10
    / user per year

Description of BS 7769-2.2:1997 1997

The method described in this International Standard is applicable to any type of cable and group running horizontally, provided that the cables are of equal diameter and emit equal losses.

Information is provided on the reduction in permissible current when cables are mounted adjacent to each other. It is limited to the following cases:

  1. a maximum of nine cables in a square formation, see Figure 1, and

  2. a maximum of six circuits each comprised of three cables mounted in trefoil, with up to three circuits placed side by side or two circuits placed one above the other, see Figure 2.

Caution is advised where air flow around the cables may be restricted by proximity to neighbouring objects.

NOTE Further work is to be done to extend and refine the data and to include the effect of dielectric loss.

Information is provided for the following situations:

  • Where a rating for one cable or circuit assumed to be isolated exists, group reduction factors can be derived for the same type of cable, see 4.1.

  • Where previously calculated ratings are not available, the data provided can be used to calculate permissible currents for groups of cables, using the formulae in parts 1 and 2, see 4.2.

  • Where adequate clearances can be provided between cables to avoid a reduction in permissible current, see clause 5.



Applicable to any type of cable and group, running horizontally. Information is provided on the reduction in permissible current when cables are mounted adjacent to each other.

Standard NumberBS 7769-2.2:1997, IEC 60287-2-2:1995
TitleElectric cables. Calculation of the current rating. Thermal resistance - A method for calculating reduction factors for groups of cables in free air, protected from solar radiation
StatusConfirmed
Publication Date1997-02-15
DescriptorsRated current, Electric cables, Thermal resistance, Electric conductors, Formulae (mathematics), Mathematical calculations, Multicore cables
ICS29.060.20 Cables
CommitteeGEL/20/16
ISBN0 580 26923 X
PublisherBSI
Pages12



About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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