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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:8
reply to kherr

Re: Backfeed breakers ... are they the same .....

Retainers are required any time you use any CB other than a "integral main" for connection to the power source.

The intention is to keep it from dislodging during a fault event.

Say you have a "main lugs only" panel, but want to have a "local" main CB for a disconnecting means. You would then need to install a retaining bracket.