Equipotential bonding help

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Diego168

Well-known member
Apr 9, 2019
52
Ct
Hi everyone. I recently bought a 7x7’hot tub. I have an old 9’x9 concrete pad with rebar where I want to place the tub. Since this is not a new concrete pad there is no access to the rebar for me to connect to my bonding copper wire. How can I bond the concrete pad. Would it be ok to drill and place rod and attach it to the bonding wire. Or is there other options that don’t requiere I pour a new slab

Thank you
 
Equipotential bonding of the perimeter surfaces is not required if the installation meets the following conditions in 680.42(B) 1-4:
  1. The spa or hot tub shall be listed as a self-contained spa for aboveground use.
  2. The spa or hot tub shall not be identified as suitable only for indoor use.
  3. The installation shall be in accordance with the manufacturer’s instructions and shall be located on or above grade.
  4. The top rim of the spa or hot tub shall be at least 28 in. above all surfaces around the hot tub that are within 30 in., measured horizontally from the spa or hot tub. The height of nonconductive external steps for entry to or exit from the self-contained spa shall not be used to reduce or increase this rim height measurement
A spa or hot tub must be listed by one of the third party testing agencies like UL, Met Labs, or ETL and meet all of the conditions in 680.42(B) if an equipotential bonding grid is not installed.
www.jadelearning.com

Pool and Spa Wiring Part II – JADE Learning

Here is a list of the most common electrical mistakes made when installing a hot tub outdoors
www.jadelearning.com
 
JamesW said:
Equipotential bonding of the perimeter surfaces is not required if the installation meets the following conditions in 680.42(B) 1-4:
  1. The spa or hot tub shall be listed as a self-contained spa for aboveground use.
  2. The spa or hot tub shall not be identified as suitable only for indoor use.
  3. The installation shall be in accordance with the manufacturer’s instructions and shall be located on or above grade.
  4. The top rim of the spa or hot tub shall be at least 28 in. above all surfaces around the hot tub that are within 30 in., measured horizontally from the spa or hot tub. The height of nonconductive external steps for entry to or exit from the self-contained spa shall not be used to reduce or increase this rim height measurement
A spa or hot tub must be listed by one of the third party testing agencies like UL, Met Labs, or ETL and meet all of the conditions in 680.42(B) if an equipotential bonding grid is not installed.
www.jadelearning.com

Pool and Spa Wiring Part II – JADE Learning

Here is a list of the most common electrical mistakes made when installing a hot tub outdoors
www.jadelearning.com
Click to expand...
Thank you. I have to check the label of the spa I bought, it hasn’t been delivered. It’s a master spa clarity 7. I read the instruction from their website and It calls for a bonding grid and it comes with a few locations to attach bonding wire.
What should I do about the concrete slab, drill into it place bonding rods 2 per side?
Or rubber mats
 
If you don't need to do a bonding grid, then that's the easiest thing.

If you do, you probably have to get a solid connection to the rebar or maybe set new rebar or mesh and repour the slab.

You could probably pour over the existing pad.
 
JamesW said:
If you don't need to do a bonding grid, then that's the easiest thing.

If you do, you probably have to get a solid connection to the rebar or maybe set new rebar or mesh and repour the slab.

You could probably pour over the existing pad.
Click to expand...

What if I was put rubber mats Home Depot sells they are like 1-2 inch thick, lay them on the concrete pad have the tub on the rubber mats.
 
A rubber mat will not hold well over the years. Once you have the tub in place you don’t want to need to move it to replace a mat.
 
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ajw22 said:
If you put cooper mesh under a new concrete pour that becomes the pad your tub is bonded to.

Click to expand...
Thank you. I think this is the easiest solution.
I thinks that when concrete gets wet it allows the flow of different voltages to the structural rebar. So if there is a bonding grid over the old concrete with a layer resurfaced concrete. This would bond everything ??‍♂️. Seems to make sense.
Either way the tub with be almost to the edge of the concrete pad so not much surface for me to step on.
 
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