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Why does Product Selectors call out a larger I-Line interior for (9) 3`` breakers requiring 27`` of mounting space?

The 27`` interior has 13.5`` of space on each side allowing (4) 3`` breakers on each side with a 1.5`` space left over on each side. The ninth breaker can`t be split in half so the product selector is going to the next size panel.

Revised 3/10/04

CTA-ID : 2005911
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