Type BL Branch Feeder AFCI Breakers
A Branch Feeder Type Arc Fault Circuit Interrupter (AFCI) is a device intended to mitigate high current arcing faults in the complete circuit. Hitch current arcing faults occur from line-to-neutral or line-to-ground. These arcing faults are in parallel with the load.
The Branch Feeder Type AFCI is required in the 1999 and 2002 National Electrical Code (NEC).
2005 NEC Section 210.12
Dwelling Unit Bedrooms. All 120-volt, single phase, 15 and 20 amp branch circuits supplying outlets installed in dwelling unit bedrooms shall be protected by a listed arc-fault circuit interrupter, combination type installed to provide protection of the branch circuit. Branch/feeder AFCIs shall be permitted to be used to meet the requirements of 210.12(B) until January 1, 2008.