Quote:
|
Originally Posted by dznewz
FWIW, that Square D switch isn't UL rated as "Transfer Switch Equipment" (UL 100  . It is UL rated as a "Enclosed and Dead-Front Switches" (UL 9  .
Anyone care to comment on the difference? Significance?
|
The requirements for listing are buried in the NEC sections 701 and 702 and there is a table somewhere that gives the required UL listing number when a listing category is described. As I read these over and over, I was fairly confident that this is the situation (but you never know with the NEC):
If the transfer switch has integral overcurrent protection, then it must be listed as Transfer Switch Equipment (UL 100

. I saw no other listing requirements, but I'd assume there is a listing requirement for switches somewhere, so that is where UL 98 comes from.