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Can a QO330L200G be converted to a main circuit breaker loadcenter?<br /><br />

No, you cannot convert the main lug load center to a main circuit breaker load center, unless you choose to backfeed a branch circuit breaker as a backfed main. A PK3MB, retaining kit also has to be used to retain the backfed main circuit breaker to the interior. The maximum ampacity for backfeeding would be 100A.

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