Punching holes in N3R cabinets

[Power Solutions]

Need to make sure I'm not missing something.
I would like to punch a 3-1/2 in hole about 20 inches from the bottom of a N3R 400 amp disconnect to install a short piece of conduit from the meter base mounted next to it.
The only reference I can find covering this non-factory entrance is:
312.2 states " For enclosures in wet locations, raceways or cables entering above the level of uninsulated live parts shall have fittings listed for wet locations"
Is there any section I have missed that would not allow this?
Dj

 

[infinity]

It's allowed by the NEC. If as you've noted the live parts are above the KO then you can use a raceway with standard locknuts and it's does not need to be listed for wet locations.

 

[Power Solutions]

The new hole would be slightly above the load side terminations of the disconnect.

 

[Power Solutions]

Is there a gasket in production for a 3-1/2 PVC male.

 

[ptonsparky]

Do you have enough room to make your bends at this location? From experience, it can get pretty tight.

 

[infinity]

The new hole would be slightly above the load side terminations of the disconnect.

Then you would need to lower the KO or use a wet location fitting like a Myers hub with the appropriate raceway.

 

[Cow]

I use sealing locknuts on standard ma's when I come in the side above terminations.

I would agree with ptonsparky though.

If at all possible, I would come in the side near the top of the disconnect so your wiring can be installed over and down into the line side lugs.

 

[Power Solutions]

Is there any other section besides 312.2 that covers the ability to do this? The AHJ believes I am not permitted to punch an additional hole in the disconnect. He believes I have to use knockouts that are existing.

 

[ptonsparky]

Is there any other section besides 312.2 that covers the ability to do this? The AHJ believes I am not permitted to punch an additional hole in the disconnect. He believes I have to use knockouts that are existing.

Ask him for the section you are violating. He should provide that information.

 

[electrofelon]

Ask him for the section you are violating. He should provide that information.

Also could remind him of factory panelboards that have no knockouts at all. What are they, art pieces?

 

[infinity]

Is there any other section besides 312.2 that covers the ability to do this? The AHJ believes I am not permitted to punch an additional hole in the disconnect. He believes I have to use knockouts that are existing.

He's wrong. As mentioned there are panelboards, wireways and pull boxes that come with no KO's.