kenaslan
Senior Member
- Location
- Billings MT
Has anyone ever heard of derating wire due to terminal resistance???
So confused
Ken
So confused
Ken
bob said:Derating may be required due to the terminal temp rating.
The concept not only is absent from the NEC, it is entirely meaningless. When you talk about wire and use the word ?derating,? you are talking about the amount of current you are allowed to pass through the wire, under the conditions of installation. The resistance of a terminal point will certainly impact the amount of current that will pass through the wire. Current is equal to the applied voltage divided by the total resistance, and the resistance of the terminal is part of the total resistance. But the resistance of the circuit has nothing to do with the amount of current you are allowed to pass through the wire (i.e., the ampacity).kenaslan said:Has anyone ever heard of derating wire due to terminal resistance???