Hot Tub Bonding?

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Jerseydaze

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I have a customer who wants to place a hot tub on a bed of crushed stone my question is do I need to use a ground mesh under the stone .This is in Jersey
 
Jerseydaze said:
I have a customer who wants to place a hot tub on a bed of crushed stone my question is do I need to use a ground mesh under the stone .This is in Jersey
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In the 2008 I would say yes. That is usually good enough for me even if the 2005 does not require it.

2) Perimeter Surfaces. The perimeter surface shall extend for 1 m (3 ft) horizontally beyond the inside walls of the pool and shall include unpaved surfaces as well as poured concrete and other types of paving.
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buckofdurham said:
Okay, I thought I had missed something and they we're requiriiing a wire mesh ground.
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Actually the grid would be made of copper wire not smaller than #8 or rigid metal conduit of brass
 
romexking said:
What is everyone's opinion on placing a hot tub on an existing pad? My local inpsectors do not require the bonding grid in this instance. How about yours?
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I think they're being generous, since there's not really any relief in the code such that the grid can be waived if the pad is existing. I did have a customer place their hot tub mostly over a flat Bilco-type door, so I was permitted to bond the Bilco door for use as the bonding grid.
 
While I agree that it is generous, I also believe that it is reasonable. After all, we don't have to install a ufer ground when replacing a panel. I don't think that they should have to tear up existing concrete for this.

Hey that gives me an idea for product that I can have forced into the code...an 3' wide insulating mat that extends from under the tub to the 3' requirement around the tub, and is bonded to the tub.

I'm goin' to be rich I tell ya!:D
 
romexking said:
While I agree that it is generous, I also believe that it is reasonable.
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The only problem I have with it is that the NEC has no allowance for that and if an accident happens the EC will be held accountable for not following the code.

I am not saying that lack of grid will cause an accident only that if there is an accident that will be used against the EC.
 
romexking said:
While I agree that it is generous, I also believe that it is reasonable. After all, we don't have to install a ufer ground when replacing a panel. I don't think that they should have to tear up existing concrete for this.

Hey that gives me an idea for product that I can have forced into the code...an 3' wide insulating mat that extends from under the tub to the 3' requirement around the tub, and is bonded to the tub.

I'm goin' to be rich I tell ya!:D
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The ONLY thing the two have in common is concrete.
Not having a uffer does not create a hazard
Not having a bonding grid does create a hazard


Also, the bonding grid you invented, already exists. Cancel the order on that new boat. :grin:
 
Is there any other mat than the "equibond" mat? Also is there a any type of mat that can be placed under the tub, but above the paving, so the concrete doesn't have to be removed and replaced?

thanks in advance.
 
From what I've been told by the NJ State Division of Codes and Standards, if you set the tub on pavers, concrete or stone you'll need the equipotential bonding grid (EBG). If it is set on wood or decking material you don't or if it's set on grass or the earth you don't (go figure ! For some reason they don't consider grass or soil conductive) BTW, if you have an existing concrete pad and you are able to access any rebar or wire mesh embedded in the concrete we here in NJ are accepting that as an EBG.
Jerseydaze said:
Btw the bond grid cost is $375 for 50ft and $525 for 100ft
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Welcome to America.:D Shop around. Try Warshauer Electric in Parsippany or Tinton Falls, NJ (732-741-6400). You might get a better price.
 
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