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If his quote says he is 12 QOB120 & 8 20 amp 1 Pole Spaces is he getting charged extra for the blank spaces?

Not really. But the interiors are standardized so that the smallest and least expensive interior and components are used to meet the specified requirments. In his case a 20 circuit panel will meet the requirement of the 12 circuits and the 8 spaces. If future space were not specified a 12 circuit interior and enclosure could have been used.

CTA-ID : 2013339
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