Prepping for eventual hot tub


  #1  
Old 02-18-14, 03:06 PM
P
Member
Thread Starter
Join Date: Feb 2014
Location: usa
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
Prepping for eventual hot tub

Hello,

I've been doing quite a bit of researching on this, but wanted to run by the board my plan and a couple of questions.

Background: House is a 1950s mid-century modern in San Diego; house is concrete block construction. I want to prepare for a hot tub at some point. Hot tub location would be near a 90A subpanel that has capacity (I did the load calcs). With some other remodeling going on, I have ok access to the panel and to where I'd exit the house with the wiring. Basically, it's a good time for me to run the inside of the house part of the wiring now and I"ll complete the outdoor portion later.

I plan to run a 50A GFCI circuit with 6/3 w/ ground NMB from the subpanel to where I'd exit the building and mount the spa disconnect (which is greater than 5 feet away from where the hot tub would be located). From the spa disconnect, I'd run 1" PVC conduit to where the hot tub would be located and eventually pull 4-wire 6AWG THWN.

My questions:

1) I know it would be better to run conduit even inside, but it's going to be pain to make that work. From my reading, there is no issue with the NMB inside. Is that correct?

2) What's the best way to transition from NMB to outside? I know NMB can't be used outside (even in conduit), but does the code that allows NMB to be inside of conduit for a short distance for protection allow me to take it down the spa disconnect inside a piece of 1" PVC conduit off a LB? Otherwise I assume that I'll have to put a big 6x6 waterproof junction box where the cable exits the house and slice to THWN there before going down to the spa disconnect - I'd rather avoid those splices if I can.

Thanks for the help.

peak
 
  #2  
Old 02-18-14, 05:10 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 13,974
Received 194 Upvotes on 170 Posts
Bring the cable directly into the back of the spa panel or disconnect.

Don't forget the 120 volt convenience receptacle that is needed also.

Depending on the code cycle you may need a bond grid under and around the tub.
 
  #3  
Old 02-19-14, 09:38 AM
P
Member
Thread Starter
Join Date: Feb 2014
Location: usa
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
pcboss, thanks for the reply.

I failed to mention that I have to come out the wood top plate due to the concrete block walls and what I can access. Otherwise, I'd go straight down the wall and into the back of the disconnect box as you mention.

Other suggestions for coming down from the top plate and into the disconnect box?

peak
 
  #4  
Old 02-19-14, 01:49 PM
CasualJoe's Avatar
Member
Join Date: Jan 2010
Location: United States
Posts: 9,870
Received 185 Upvotes on 166 Posts
Other suggestions for coming down from the top plate and into the disconnect box?
You'll have to do it with conduit and THHN/THWN conductors. NM-B cable cannot be used outdorrs, no exceptions.
 
  #5  
Old 02-19-14, 04:58 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 13,974
Received 194 Upvotes on 170 Posts
With that lack of option you will need a junction box inside to make the transition to conduit.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: