Metric Cable Derating
Metric Cable Derating
(OP)
Does IEC 287 or other IEC standards require derating Direct Buried 3/c Medium Voltage Cable based on thermal conductivity?
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RE: Metric Cable Derating
RE: Metric Cable Derating
Could you elaborate how the derating is calculated? Is the Neher-McGrath method used?
RE: Metric Cable Derating
The main differences in both methods are the units system used (English vs. SI/metric). Also the IEC method includes new developments of cable laying, configuration and drying soil effect due to heating by loaded power cable. Another standard, IEC 853-1 & 2 supplement IEC-287 covering cyclic load and emergency ratings.
See the enclose links for information regarding thermal resistance consideration in IEC 287.
http://www
http://www.elect.mrt.ac.lk/IEE2002powercables.pdf
RE: Metric Cable Derating
Thanks a lot. That's just what I needed.