Branch circuit through hub in top of 3R loadcenter

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bobster789

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Location
Edmond, Oklahoma
I have a Eaton NEMA-3R loadcenter (meter feed is through the bottom right knockout) installed on the brick veneer of the outside of my home. The top hub is currently unused. I would like to install a DS200H2 hub and run a Carlon PVC conduit about 48" through the soffit above the panel. The conduit will be used to protect 4 new branch circuits run with #12 THWN-2 stranded conductors to a junction box in the soffit space. From there I will extend these circuits using 12/2 w/g NM cable. Are there any code violations with doing this?
 
I think the only code compliant way to do that would be to use a rigid nipple in the conduit hub and a female adapter to switch to PVC. Male adapters have not been evaluated for use with female threads.
 
don_resqcapt19 said:
I think the only code compliant way to do that would be to use a rigid nipple in the conduit hub and a female adapter to switch to PVC. Male adapters have not been evaluated for use with female threads.
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I don't believe that's correct for PVC. UL 651 covers PVC fittings and conduit (but not PVC conduit bodies), and Section 1.5.3 in the Scope chapter says that "Externally-threaded adapters (also referred to as terminal adapters) covered by these requirements are fittings intended for joining a length of rigid PVC conduit or elbow to: . . . (b) A threaded metal hub or fitting on a metal box"

I think that's definitive, but since I spent some time looking at UL 514B on Conduit, Tubing and Cable Fittings, I'll also note:

UL 514B 3.23 defines a Hub as "A fitting intended for use with threaded conduit for connection to an enclosure." No requirement for it to metallic conduit.

Carlon's catalog describes a Male Terminal Adapter as "For adapting nonmetallic conduits to boxes, threaded fittings, metallic systems. Male threads on one end, socket end on other." A hub is a threaded fitting.

Cheers, Wayne

P.S. This is just for PVC. For, say, EMT, a regular EMT connector is intended for connecting to a sheet metal box, and will come with a locknut on it to signify that (and its threadig may be neither NPS nor NPT), as per UL 514B 5.8.1.5. There are special EMT male adapters that have tapered threads that have been investigated to use with female threaded fittings.

Cheers, Wayne
 
wwhitney said:
I don't believe that's correct for PVC. UL 651 covers PVC fittings and conduit (but not PVC conduit bodies), and Section 1.5.3 in the Scope chapter says that "Externally-threaded adapters (also referred to as terminal adapters) covered by these requirements are fittings intended for joining a length of rigid PVC conduit or elbow to: . . . (b) A threaded metal hub or fitting on a metal box"

I think that's definitive, but since I spent some time looking at UL 514B on Conduit, Tubing and Cable Fittings, I'll also note:

UL 514B 3.23 defines a Hub as "A fitting intended for use with threaded conduit for connection to an enclosure." No requirement for it to metallic conduit.

Carlon's catalog describes a Male Terminal Adapter as "For adapting nonmetallic conduits to boxes, threaded fittings, metallic systems. Male threads on one end, socket end on other." A hub is a threaded fitting.

Cheers, Wayne

P.S. This is just for PVC. For, say, EMT, a regular EMT connector is intended for connecting to a sheet metal box, and will come with a locknut on it to signify that (and its threadig may be neither NPS nor NPT), as per UL 514B 5.8.1.5. There are special EMT male adapters that have tapered threads that have been investigated to use with female threaded fittings.

Cheers, Wayne
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Thanks, Wayne! I was also wondering whether there was any restriction on using the hub in the top for branch circuits (vs. service feeders).
 
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