Magnet coils when passing current is always over ambient room temperature (specifically more whenever a solenoid is enclosed) so care has to be taken in designing and reference temperature is to be taken as 75 Centigrade where as ambient temperature is about 30 Centigrade.

Magnet coils when passing current is always over ambient room temperature (specifically more whenever a solenoid is enclosed) so care has to be taken in designing and reference temperature is to be taken as 75 Centigrade where as ambient temperature is about 30 Centigrade.