Outdoor spa bonding

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Old 12-05-13, 09:13 PM
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Question Outdoor spa bonding

I haven't wired an outdoor spa in several years so I was kind of surprised when the inspector told me I needed a perimeter bonding grid.

This was a 50A 240vac outdoor permanently wired spa/hot tub.

The perimeter grid is 18"-24" from the edge of the hot tub, all the way around and down 6" in the ground. It gets bonded to the ground bar in the tub.

He said this bonding method is required so that if there are any stray electrical fields underground they get dissipated to ground and that the tub and ground are at the same potential.

Anyone run into this ?
 
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Old 12-05-13, 09:43 PM
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Yep. Been there and had to do it.

Have you looked at Mike Holt's stuff on stray voltage and different ways to deal with it?
 
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Old 12-06-13, 05:31 AM
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Thanks for that link Nash. Some real wild stuff.
 
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Old 12-06-13, 07:27 AM
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It is. Makes installing a ground loop suddenly seem a lot more worthwhile, doesn't it? We had to do that for a parking garage on one job.
 
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Old 12-07-13, 07:18 PM
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The 2014 removes this requirement for the bond under certain conditions. The last one I did was in crushed stone.
 
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