Thunderchild
New Member
We have a number of electric fans at work that have been returned by a customer in very poor condition. For some reason the manufacturer has out two inductors in the motor each in series with one of the supply wires. The wire diameter is 1mm (18 AWG) and these inductors are very badly burnt up to the point some have melted the copper wire ! The fans will easily draw up to 14-15 amps and I've been running the fans in a warm environment (to simulate a vehicle engine bay) to the point that the fans outer case reaches 80C.
What sort of amperage derating is applied to single core copper wire with enamel insulation ? surely 1mm is far too small ? what we cannot understand though is hoe the copper wire is melting !
What sort of amperage derating is applied to single core copper wire with enamel insulation ? surely 1mm is far too small ? what we cannot understand though is hoe the copper wire is melting !