In article , Pete C. says...

But really all they do is close one residential quality breaker
while opening another. If the utility side breaker sticks closed
then the backfeed will happen.

The probability of any of the breakers in your panel sticking closed is
very low and probability of the one specific utility feed breaker
sticking closed is extraordinarily low. This is particularly true since
those main breakers are generally running far below their ratings,
unlike individual branch circuits which operate at 75% load far more
frequently.

The implicantion in the above statement is clear: that it would
acceptable to backfeed through one breaker and mechanically lock
out the main breaker in the panelboard - because the chance of it
sticking closed is "very low."

Jim


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