I'm planning on adding whole house surge suppression. The simplest to do is to use the Siemens QSA2020TVSS breaker in my Siemens main panel. This would simply replace two existing breakers. My other option is a hardwired unit mounted immediately adjacent to my panel. It requires that I connect its leads to two adjacent circuit breakers on my panel.
One of these product's installation manual stated that it was acceptable to place the TVSS lead in the same terminal screw with an existing load wire. That would mean two black wires coming out of the same breaker.
I've never before read anything that would allow two black wires connected to a breaker. Is there an exception in the NEC that allows a TVSS device to be connected to the load side of a breaker along with the load wire itself? If not, I'm limited to the QSA2020TVSS, because my panel is full.
Thanks.
P.S. If anyone has recommendations as to what is the best method / brand for whole house surge supression, feel free to share your knowledge
One of these product's installation manual stated that it was acceptable to place the TVSS lead in the same terminal screw with an existing load wire. That would mean two black wires coming out of the same breaker.
I've never before read anything that would allow two black wires connected to a breaker. Is there an exception in the NEC that allows a TVSS device to be connected to the load side of a breaker along with the load wire itself? If not, I'm limited to the QSA2020TVSS, because my panel is full.
Thanks.
P.S. If anyone has recommendations as to what is the best method / brand for whole house surge supression, feel free to share your knowledge