Class A and Class B wiring on a Fire Alarm Fire and Security Prot..., Fire Security Access C...love9099June 11, 2015Alarm, class A, class b, Electrical, Fire Alarm, Fire System, IFC, Larry Love, NAC, NFPA, nfpa 72, Peak, Peak Alarm, R-710, R710, Salt Lake, simple explanation, style, Utah, Utah code, wireComment