Where in the NEC does it address the install circuit breakers into an I-Line Panelboard? For example; I?ve seen an 800 amp I-Line with over 800 amps worth of CBs installed. The actual current drawn (continuous) is far less than the CB ratings, so I-Line current limit never reached.
I?ve heard of an 80% rule for sizing CBs, from the example above, the maximum current should be 80% of 800 amps or 640 amps. This maybe a ?best practices? rule.
Back to the 800 amp I-Line, is there a maximum sum of ampacity (sum of all CBs in the I-Line) allowed by NEC? For instance, you can install 1000 amps worth of CBs in an 800 amp I-Line.
I?ve heard of an 80% rule for sizing CBs, from the example above, the maximum current should be 80% of 800 amps or 640 amps. This maybe a ?best practices? rule.
Back to the 800 amp I-Line, is there a maximum sum of ampacity (sum of all CBs in the I-Line) allowed by NEC? For instance, you can install 1000 amps worth of CBs in an 800 amp I-Line.
