Overlapping working space, angled corner wall

B

brycenesbitt

Senior Member
Location
United States
I work in a jurisdiction known not only for crossing t's and dotting i's but being particular about the shape of the dot on the i .
We're looking at spot N for a new panel in a 1960's building. A and B are existing 240V single phase panels.
Capture - Holt - Corner Overlap.jpg

I see Mike Holt's letter "Working Clearances, based on the 2020 NEC" that says overlap is fine,
but I don't see any NEC section that explicitly allows it.
The equipment has a removable, no hinge door.

What can I use to back myself up, in case this AJH calls it out? Does it seem OK to you?
 
Is the space for “N” 30” wide? Seems ok by the way you’ve drawn it.
 
brycenesbitt said:
I see Mike Holt's letter "Working Clearances, based on the 2020 NEC" that says overlap is fine,
but I don't see any NEC section that explicitly allows it.
Click to expand...
FWIW, the NECH authors also interpret it the same way as Mike.
 
The way it's drawn the distance between panels A and B would need to be a minimum of 30".
 
brycenesbitt said:
Yes, the gap is about 32 inches wide at the narrowest, the new panel is planned to be 24" wide and 4" deep.

The issue that concerns me is the local AHJ tends to read the NEC clauses as permission not as constraints.
Click to expand...
I see no issue or possible misinterpreting the code language. The panel requires 30" of width for the working space you've stated that you have 32".
 
brycenesbitt said:
I see Mike Holt's letter "Working Clearances, based on the 2020 NEC" that says overlap is fine,
but I don't see any NEC section that explicitly allows it.
Click to expand...
The NEC requires you to look at one panel and confirm that it has clearance. If you then notice another panel in the room, you need to confirm that it has clearance. The presence of nearby panels means nothing, so long as each has clearance.
 
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