Neil Sakaitis
Member
I have #2 SC tails to CAMS. WIthout getting into the details of the setup and location, I was wondering if it is ok to directly feed the SC cable into a panel circuit breaker (Square D). My understanding is that only THHN wire should be used inside the panel, and lugs close more firmly around THHN wire. My understanding is that tightening down on an SC cable for Neutral and Ground on a buss lug could be acceptable, so long as you don't crush the SC cable much and the lug and cable are properly sized (no big space gap).
My concern has more to do with the physical connection between a panel circuit breaker and the SC cable. If there is no physical tension on the SC cable (held firmly at the panel), technically the screw down connection on a breaker will hold the SC cable in place.
In other words, a lug in a breaker panel should be similar to a lug on a disconnect panel, and care is taken not to crush the SC cable. But on a panel circuit breaker, my understanding is that the physical connection is not similar to a lug, and usually the requirement is only to use THHN cable with breakers.
Comments and thoughts ??
My concern has more to do with the physical connection between a panel circuit breaker and the SC cable. If there is no physical tension on the SC cable (held firmly at the panel), technically the screw down connection on a breaker will hold the SC cable in place.
In other words, a lug in a breaker panel should be similar to a lug on a disconnect panel, and care is taken not to crush the SC cable. But on a panel circuit breaker, my understanding is that the physical connection is not similar to a lug, and usually the requirement is only to use THHN cable with breakers.
Comments and thoughts ??