The NEC addresses this as follows:Ģ005 NEC®© 408.36 Overcurrent Protection. The power is applied to the breaker terminals where a branch circuit might go. A backfed panel generally refers to the illegal practice of hooking up a standby generator to a panel through a breaker without the benefit of a safety interlock.Ī backfed main breaker, as noted above, is the entirely legal (and common)practice of taking a panel (usually)equipped with main lugs and installing a branch circuit style(plug on)breaker that is used as a main breaker. The differences in terminology are subtle.