BS 7769-2.2:1997
Current
The latest, up-to-date edition.
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
Hardcopy , PDF
English
02-15-1997
Committees responsible
National foreword
Introduction
Method
1 Scope
2 Normative references
3 List of symbols
4 Method
5 Values of clearance to avoid a reduction in
current-carrying capacity
6 Procedures to derive the reduction coefficient
for grouped cables
Table
1 Data for calculating reduction coefficients for
grouped cables
Figures
1 Typical groups of multicore cable a),b),c),d),e);
e) is the largest size of group covered by data
2 Typical groups of trefoil circuits a),b),c); c) is
the largest size of group covered by data
3 Values of (h1hg) for two cables in a vertical plane
4 Values of (h1hg) for three cables in a vertical plane
5 Values of (h1,hg) for two trefoil groups in a vertical
plane
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