Re: cable size & material vs current capacity

Home Electrical Engineering Forum General Discussion cable size & material vs current capacity Re: cable size & material vs current capacity

#12063
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Hello Sir,

It is recommended to finalise Ampacity for Cable (Single core / Multic core) by manufacturers recommendation, hence as a designer we should consider where we are using cables i.e Ambient temperature and area (Under ground, Over hanging, inside control panel  or Control panel to field wiring).

For all these case we should consider derating factor and Factor of safety.

For E.g – if manufacturer specified as Current rating for 95 sq.mm cable @ 30 Deg C as 292 A, based on our working condition we should fix actual current capacity of this cable. Barely fix FOS as 77% – then this cable appicable for current rating of upto 224.8A.

B.Karthikeyan,