lsubrian83
Electrical
- Mar 11, 2010
- 2
I'm working in an industrial environment (refinery) and have the following question:
I have a panelboard, with main circuit breaker included, 225A rated. It is a 42-ckt, 125VDC panelboard. Construction has installed a 2nd panelboard, main lugs only, fed from the bus of the 1st panelboard. A 3rd panelboard has been installed, main lugs only, fed from the bus of the 2nd panelboard. All of these panelboards are identical 125VDC, 42-ckt. They are located in the same building (230kV substation control room). Does the NEC code allow this installation, assuming loads do not exceed 225A? In other words, does the upstream main breaker of the 1st panel qualify as protection for the downstream 2nd/3rd panels? Please provide article numbers from the code with your answer.
Thanks!
I have a panelboard, with main circuit breaker included, 225A rated. It is a 42-ckt, 125VDC panelboard. Construction has installed a 2nd panelboard, main lugs only, fed from the bus of the 1st panelboard. A 3rd panelboard has been installed, main lugs only, fed from the bus of the 2nd panelboard. All of these panelboards are identical 125VDC, 42-ckt. They are located in the same building (230kV substation control room). Does the NEC code allow this installation, assuming loads do not exceed 225A? In other words, does the upstream main breaker of the 1st panel qualify as protection for the downstream 2nd/3rd panels? Please provide article numbers from the code with your answer.
Thanks!