Quote:
The blank slot covers are beside the 100A master breaker.
Which means there probably are NOT any usable slots under them.

Do you think that the main breaker uses the whole of the hot bus bars' poles and not just the left or right half like a "normal" breaker? I was kinda guessing that, too, but my main breaker is not in the service panel, and I couldn't find any documentation online to support that.
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Bitt Faulk