dennis5150
Member
Does busbar have to be derated similar to conductors, in that they shall have an allowable ampacity of 125% of the continuous load, or is the derating for insulated "conductor" only?
If you look at 210.20.(A), its the OC device that has the 125% factor and the conductor is chosen to match.dennis5150 said:Does busbar have to be derated similar to conductors, in that they shall have an allowable ampacity of 125% of the continuous load, or is the derating for insulated "conductor" only?
Busbar can continuously carry the rated current of the equipment.
raider1 said:So can an insulated wire. The reason for the 125% for continious load is due to the fact that most overcurrent devices aren't rated to carry 100% of the load continiously.
Chris