A arizim Member Oct 13, 2005 #1 This relates to room fire ratings. My understanding is that any transformer OVER 112.5KVA requires a 1-hour rating. I assume that 112.5 and under does not. Is this correct?
This relates to room fire ratings. My understanding is that any transformer OVER 112.5KVA requires a 1-hour rating. I assume that 112.5 and under does not. Is this correct?
raider1 Senior Member Staff member Location Logan, Utah Oct 13, 2005 #2 Re: NEC 450-21(b) Check out 450.21 (A) Chris
