(4) Claim: AFCIs do not protect against ground faults, high-resistance contacts and glowing contacts.
Finding: AFCIs on the market do protect against ground faults. While these AFCIs may not directly detect some electrical arcing and glowing that can occur at high-resistance contacts and other connection points, the devices respond to secondary arcing and leakage currents to the ground that result from degraded insulation between conductors in proximity to the incipient fault condition.
Then UL revised the AFCI standard and the NEC is requiring the use of combination AFCIs for no reason???????????????? There is no technical justification for these changes??????????????
Don
