||07-18-2014 09:46 AM
Originally Posted by Cletis
Yo. If I run #10 Thhn in conduit to an A/C disconnect and fuse it with a 40 amp 2 pole hacr breaker and 30 amp fuses in disconnect will this pass NEC code?
Thanks in advance
Don't make this complicated. First you read the unit condensers nameplate. It will state minimum circuit ampacity and maximum ocpd.
In some cases a BCSC (branch circuit selection current) will be on the nameplate.
Maximum OCPD may be stated as a circuit breaker/fuse in which case you may apply it to a breaker panel or fuse panel. If you have a breaker panel that supplies the unit and the nameplate states max fuse
size then install a fusible a/c disconnect with correct fuses (not any ole fuse works). Other wise install the max circuit breaker (HCAR type) in the panel and size the conductors to carry the MCA ampacity and your done. Use a non fusible disconnect located near the unit and don't forget the service receptacle requirement.