EMT nema 3R

[wireday]

Is it correct to use a factory side knockout on a outside 3R disconnect. Would like to put EMT to the side of disconnect. The terminals would be above the knockouts. Also is it ok to run the 120 volt service receptacle conductors through the same EMT into the disconnect. The recept conductors would pass through to an FS box.

 

[augie47]

OK & OK

 

[electrofelon]

Only thing is running the receptacle conductors with the HVAC (assuming) conductors will get you into required derating. It wont be an issue for the receptacle conductors but may for the HVAC. It sure seems nit picky but I dont see an exception.

 

[dkidd]

You'll need raintight EMT fittings.

 

[wireday]

I went back and looked, the side hole is not factory but is down below the terminals and all. Is that still ok, and yes I ordered rain right EMT connectors

 

[kwired]

Only thing is running the receptacle conductors with the HVAC (assuming) conductors will get you into required derating. It wont be an issue for the receptacle conductors but may for the HVAC. It sure seems nit picky but I dont see an exception.

Usually is not a problem until you exceed 9 CCC's, but yes something to watch out for.

I went back and looked, the side hole is not factory but is down below the terminals and all. Is that still ok, and yes I ordered rain right EMT connectors

The rubber washer that comes with the RT connector is sufficient to seal the penetration - until sunlight deteriorates the washer and it falls out of place:slaphead:.

Those RT fittings are one of biggest jokes that has been introduced to the trade.

 

[electrofelon]

Usually is not a problem until you exceed 9 CCC's, but yes something to watch out for.

But that 9 ccc rule starts to break down when you get to #10, that's why I said it wouldn't effect the recep circuit but may the HVAC circuit (no idea what that wire size is).

The rubber washer that comes with the RT connector is sufficient to seal the penetration - until sunlight deteriorates the washer and it falls out of place:slaphead:.

Those RT fittings are one of biggest jokes that has been introduced to the trade.

I agree, But more generally, the code doesn't seem to address entering a 3r switch like it does for meter sockets and cabinets (below live parts). Is a safety switch covered by 404, or is a switch mounted in a cabinet like a panelboard is?

 

[kwired]

But that 9 ccc rule starts to break down when you get to #10, that's why I said it wouldn't effect the recep circuit but may the HVAC circuit (no idea what that wire size is).





I agree, But more generally, the code doesn't seem to address entering a 3r switch like it does for meter sockets and cabinets (below live parts). Is a safety switch covered by 404, or is a switch mounted in a cabinet like a panelboard is?

Cabinets and meter sockets often have bolt on hubs in top wall in the worst place - directly above terminals. The hub may not leak, but any condensation in the raceway runs right into the terminals.

Leakage through a side wall penetration at least will run down the side wall instead of into terminals, and hopefully there are weep holes in the bottom of enclosure.