I have a 50/50A 2 pole breaker installed in a 200a main panel... I used 3/4" thinwall conduit from the panel down to a 3/4" LB, I put a romex connector on the end of the LB and ran 50' of 8/3 with a #10 ground romex out to a 4x4 sq wp j-box mounted on the exterior of the house for an above ground spa hook up and from there I came out with a 6' whip of 3/4" seal tite to be hard wired to the spa. My question is can I fit 6/3 with ground in the existing 3/4" conduit. I used 8/3 with #10 ground and need to replace with 6/3 with #?ground. Also can I just strip back the romex and feed it through the seal tite so I can just run it through the 4x4 wp j-box and the seal tite?? Thanks, JB
50/50A spa hook up
- Thread starter jute
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ultramegabob
Senior Member
- Location
- Indiana
jute said:
I believe most hot tubs require from the manufacture to be wired with #6 including the ground, as far as striping romex I believe that is not permitted because the individual wires in romex are not marked to identify what type of wire it is.
jute said:
Probably not. The whole romex cable is labeled as NM-B. If the individual conductors inside that cable are labeled as THWN or some other NEC wiring method you can push the individual conductors through, but I haven't seen any cable that has the individual wires labeled like that. One other problem with what you're proposing has to do with using romex outside. Take a look at 334.12(B)(4) and then look up the definition of damp and wet locations in article 100. 300.9 is the section that won't allow you to put the whole romex cable through the sealtite either.
jimport
Senior Member
- Location
- Outside Baltimore Maryland
- Occupation
- Master Electrician
The Op does not say anything about the service disconnect either. Also the stripped NM would not have the insulated ground that is needed outside.
Instead of the WP box set the disco there and then make the transition.
Instead of the WP box set the disco there and then make the transition.
jimport said:
I thought I didn't need a disco because this is a single family dwelling, thas is also a prefabricated spa that has it's own GFCI and was told by Manuf I needed a 50a/220v/4wire cuircuit and hardwire it to the spa...
I'll use (3) #6 THWN (1) #10 (is #10 is the correct size?) except in the crawl space
and will this fit in 3/4"??
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mickeyrench
Senior Member
- Location
- edison, n.j.
also i believe the ground needs to be a full size and insulated conductor.
peter d
Senior Member
- Location
- New England
jute said:
Yes, it will fit. I've done the same thing before, only it was in PVC.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
You do not need an insulated ground wire n a dwelling if the wire is in the interior of the house. Once you get outside then you do. Art. 680.42(C) is very clear about this. Some Hot tub manufacturers are requiring a full sized ground. In that case nm cable will not work. You would be better off to pipe it from the 3/4 emt all the way to the outside if possible.
You cannot sleeve nm cable on the ext. of a house. Art. 334.12(B)(4) and art. 300.9 (2008 NEC)
You cannot sleeve nm cable on the ext. of a house. Art. 334.12(B)(4) and art. 300.9 (2008 NEC)
steelersman
Senior Member
- Location
- Lake Ridge, VA
he never said he ran nm'b olong the outside of the house. I took it to mean he only used the nm'b to go throught the wall to the 4x4 j-box directly on the other side which would be fineDennis Alwon said:
steelersman
Senior Member
- Location
- Lake Ridge, VA
#8 copper if using thwn is good enough for 50Ampsjute said:
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
steelersman said:
Yeah, but he also said this
You can't do that either
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Yes in conduit but not as part of a NM cable.steelersman said:
Dennis Alwon said:
I wanted to make sure this is right so I talked to the AHJ and told him I thought #8 was only good for 40A as per table 310.16 and I need a 50A 220v circuit. He told me the wire in FNMC (romex) was good becuase the wire can be based on the THWN 75* table which makes it good for 50A... He also told me to put a 60A knife disco instead of the 4x4 and from the disco to the spa use (3) #8 THWN and (1) #10 THWN in the seal tite...So after questioning him on the size and ampacity it looks like the wire is staying where it's at and I don't need to replace it with #6. Does this sound right doing like this?? Thanks again for all the help, JB
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
jute said:
FNMC is not romex. Read art. 334.80
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
FNMC is flexible non metallic conduit and yes if you install thhn in it then it is good for 75C but NM is only good for 60C.
Dennis Alwon said:
Thanks, I'm not sure where I got that but I thought FNMC meant Flat Non Metalic Cable... My excuse is I'm usually on here early AM (4:24 am here) and not quite awake...I also need to get another NEC book whenever I'm on here it seems it's in the van...Thanks JB
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