Conduit cut-outs in sheetmetal walls

Question

Conduit cut-outs in sheetmetal walls

SrGilberto (Mechanical)

(OP)

25 Jul 06 14:30

Thanks in advance,

All,
I have 2 questions:
1) What are the hole sizes in a sheetmetal wall that is required for a conduit connector for the conduit sizes of
1/2", 1", 1-1/4", and 1-1/2" diameter?

and...

2) What is the required distance from the edge of the hole (keep out area) for the conduit connector?

Thank you for your assistance,

SrG

meterbox (Mechanical) · Answer 1 · 2006-07-27 22:37:39

See ANSI C12.7 for a table of knockout size limits & conduit bushing diameters.

aamoroso (Mechanical) · Answer 2 · 2006-08-24 18:03:26

I would also grab a copy of UL 50, that is the standard that UL would use certify a sheet metal enclosure. If your in Canada you can grab CSA 22.2 No 94 (I think, that is out of the top of my head).

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Conduit cut-outs in sheetmetal walls