We are replacing an original 1938 Westinghouse switchboard. The original gear has an enclosed top area where all of the conduits enter through the top and then pass through holes into and open air bus bar section in the back with heavy wire mesh side panels. My plan is to retain the enclosed top area and remove everything from that point to the floor.
The new panel will be a Square D I-line, lug only being fed for 700 amps on dual 500 mcm feeds. The top section of the old gear is twice as deep as the new panel (8") The new panel belts to the bottom of the old section and my plan is to bring some of the circuits through top and the remainder through the back of the new panel by way of chase nipples and then fabricating an auxiliary gutter to enclose the rear entrance cables from where they drop out of the top section and then enter the back of new I-line panel. The customer has concerns that the fabricated section won't pass code.
Question: What requirements to I need to meet for my "custom fabrication"? i.e. gauge of the metal, lack of UL approval. Support and connection are not problems because there are plenty of ceiling, floor and wall supports.
The new panel will be a Square D I-line, lug only being fed for 700 amps on dual 500 mcm feeds. The top section of the old gear is twice as deep as the new panel (8") The new panel belts to the bottom of the old section and my plan is to bring some of the circuits through top and the remainder through the back of the new panel by way of chase nipples and then fabricating an auxiliary gutter to enclose the rear entrance cables from where they drop out of the top section and then enter the back of new I-line panel. The customer has concerns that the fabricated section won't pass code.
Question: What requirements to I need to meet for my "custom fabrication"? i.e. gauge of the metal, lack of UL approval. Support and connection are not problems because there are plenty of ceiling, floor and wall supports.
