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The red tab at the breaker above is a rated securing device, and it will only be visible with the dead front removed. One additional requirement for a backfed main breaker is that the “maximum amps per stab” does not exceed what the manufacturer allows. A stab is another name for a bus bar finger.

This maximum is listed in the data plate. If you backfeed a panel with a 100-amp service breaker, and the maximum allowed by the manufacturer is 125 amps per stab, then the max you can install on the other side of the stab is 20 amps. So, the things to verify when examining a backfeed panel are: To learn more, see our blog post What is a "bus stab" in an electric panel? This is why the slots opposite a backfeed main breaker are often blank.

Is the main clearly marked as “MAIN BREAKER”?.

Does the sum of the amperages of the main breaker and the one beside it come to equal or less than the “maximum amps per stab” listed on the manufacturer’s data plate?Įven a electric panel with a regular main breaker may be backfed by a breaker below it that is used for connecting a generator to the panel for use during a power outage.Has the breaker been mechanically secured in place?. There are specific safety requirements for this type of backfeed, and they are intended to eliminate the possiblity of the both the main breaker and the generator backfeed breaker are on the same time.

See our blog post Why did my generator hookup get tagged as defective by the home inspector? for more.