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#202429 - 08/03/11 01:27 PM Re: Spas  
harold endean  Offline
Member
Joined: Feb 2002
Posts: 2,233
Boonton, NJ
Did we have the conversation before or not. I can't remember, there have been so many topics covered here.

If you place a hot tub/spa outside on a wooden deck and the deck is up in the air off the ground. ( height doesn't matter) What do you do with the equipotential bonding grid? (EBG) Do you run it around the tub under the deck? Or leave it out completely? Or what?


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#202432 - 08/03/11 02:10 PM Re: Spas [Re: harold endean]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
If you read the letter of the code, you still need to bond the dirt under the deck or if you read it the other way you have to bond the wood. Non-conducting decking is really not addressed, nor is it excepted.

I think CMP 17 has been snorting the HTH.


Greg Fretwell

#202433 - 08/03/11 02:53 PM Re: Spas [Re: harold endean]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,858
Brick, NJ USA
Harold:

This is a tough one IMHO. Conflicting 'he said/she said', and a gray area within the NEC.

There are differing opinions on the conductivity of wood, which I don't want to debate, although someone will. Composite decking is also a debate by some.

Opinions that I have heard range from the absurd (IMHO) of 'bonding the wood' to ....nothing.

Most spas that I have seen install the rubber type listed mats under and around the spa; case closed.

Installs on existing concrete or paver patios are another tough call. Bonding the existing rebar/mesh is one option, the pads is another, or the grid around the slab. Problems arise when the 'slab' is a large patio. Solutions range from finding the rebar/mesh to saw cuts & #8, or..the pads.

Welcome to confusion!!


John

#202435 - 08/03/11 03:54 PM Re: Spas [Re: harold endean]  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
Now try to explain this statement to Joe Handyman:

"We'll laugh ourselves silly when we find you ran a GEC to the incoming plastic water line, but we'll red-tag you if you fail to bond the plastic deck."


#202437 - 08/03/11 04:31 PM Re: Spas [Re: harold endean]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
Has anyone written a proposal yet?


Greg Fretwell

#202449 - 08/04/11 08:03 AM Re: Spas [Re: gfretwell]  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,311
apparently the CMP's insist on one shoe fitting all

for instance , would you feel comfortable installing a grounding grid under a spa that is in proximity to the service entrance g'ding electrodes?

~S~


#202457 - 08/04/11 02:01 PM Re: Spas [Re: harold endean]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
Why not? The pool/spa ground grid is going to be bonded to the EGC of the supply conductors in a number of places and that is bonded to the GEC.
In the case of a gunite in ground pool, that is ultimately you best grounding electrode, even though we are slow to admit it.
If it is concrete or metal at my house, it is bonded.


Greg Fretwell

#202480 - 08/04/11 10:04 PM Re: Spas [Re: gfretwell]  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,311
Originally Posted by gfretwell
Why not? The pool/spa ground grid is going to be bonded to the EGC of the supply conductors in a number of places and that is bonded to the GEC.
In the case of a gunite in ground pool, that is ultimately you best grounding electrode, even though we are slow to admit it.
If it is concrete or metal at my house, it is bonded.



well my point is , it's a potential noodle Greg

i mean, the more we bond, ground, lightning 780, or EGC a place, the more noodle potential it will have....~S~

Last edited by sparky; 08/04/11 10:05 PM. Reason: no glasses, dammit!

#202486 - 08/04/11 10:42 PM Re: Spas [Re: harold endean]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
Noodle?


Greg Fretwell

#202488 - 08/04/11 10:48 PM Re: Spas [Re: harold endean]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,858
Brick, NJ USA
Greg:

That's a common term in some areas for 'neutral'.


John

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