20 year old Murray 200A panel

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I can't tell you what may be possible with the Murray panel in the OP.

A lot of Square D installed in this area, for the most part if the old has a QOM style main today's new units will fit with no modification. I have replaced a few by swapping guts. Even upgraded single phase to three phase a time or two by swapping guts in existing cabinet without making any modifications - that generally only works with main lug only panels as the three phase main breakers are different than the single phase mains and require different cabinet and cover.
 
I would ask the AHJ if it was acceptable. Back in the early 1970's I worked at a large slaughterhouse that had a couple of two phase panels built into walls that only feed 120 volt loads. We purchased two single phase panels and mounted the interiors then trimmed covers and had them welded onto original front panel.
 
garbo said:
I would ask the AHJ if it was acceptable. Back in the early 1970's I worked at a large slaughterhouse that had a couple of two phase panels built into walls that only feed 120 volt loads. We purchased two single phase panels and mounted the interiors then trimmed covers and had them welded onto original front panel.
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Nothing to ask an AHJ about. The "guts" is the panel. The panel is listed. As long as you are not modifying the panel you're good. The housing/can is not part of the panel. As long as you fit the panel in properly, along with the cover, it's perfectly legal. I've done several retrofits and all passed inspection.
 
garbo said:
I would ask the AHJ if it was acceptable. Back in the early 1970's I worked at a large slaughterhouse that had a couple of two phase panels built into walls that only feed 120 volt loads. We purchased two single phase panels and mounted the interiors then trimmed covers and had them welded onto original front panel.
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NEC calls the housing or can a "cabinet"

Panelboards get installed in a cabinet.

The low end versions that are common in dwellings and light commercial are often called "load centers" and are simply a factory assembly of panelboard already installed in a cabinet.

Is easiest and least cost as a general rule to use these load centers or to use a real "panelboard" within a cabinet specifically designed to fit the panelboard, but at same time is not a requirement to do so.
 
Little Bill said:
Nothing to ask an AHJ about. The "guts" is the panel. The panel is listed. As long as you are not modifying the panel you're good. The housing/can is not part of the panel. As long as you fit the panel in properly, along with the cover, it's perfectly legal. I've done several retrofits and all passed inspection.
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My state does not have state license for electricians and some small town guy that is the king of the hill with not only being the only electrical contractor in town but issues electrical license then after you have your approved inspection agency come out & pass jobs they come along and fail the job because like two told me they have their own codes so found it cheaper & faster to pass things by them before work is started. Had one hick type fail me because I spliced one #14 guage wire in a panel. Told him what NEC article allowed this and he told me that " I will let you get away with it this time".
 
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