A class 'B' addressable SLC loop can be T-taped per minimum code. A class 'A' loop could not because there wouldn't be a supply and return loop. NFPA 72-2002 6.4.2.1
Most of the time, when I specify a class B circuit, I also specify no T-taps to ease the future troubleshooting burdens.
[This message has been edited by Ron (edited 05-15-2005).]
