Outdoor Hot Tub 680.42(B)

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Dennis Alwon said:
If you think wood is an insulator then get it a bit wet and touch a hot conductor. I guarantee you will not think it is an insulator. A wet deck is definitely conductive.
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So is anything else that gets wet on the surface. Tile, fiberglass, plastic. The water is the conductor. Ok so how 'wood" you bond it? What NEC article references it?
 
Amps said:
So is anything else that gets wet on the surface. Tile, fiberglass, plastic. The water is the conductor. Ok so how 'wood" you bond it? What NEC article references it?
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Water does not saturate into the plastic. If a deck has wood into the earth and it is wet it is conductive. If the deck was plastic and wet it may not give you a sock if the is no pathway to ground. The water would just sit on the plastic.

You don't bond the wood directly but you would use the perimeter bonding around the tub and connect it to the tub motor.. This will keep any voltage in the soil at the same potential as the tub.
 
Is not all of the perimeter bonding required with conductive pool material, not nonconductive pool material?

680.42 covers outdoor spas, hot tubs. It does not describe the material of the spa.
Since we are talking about equipotential bonding it tells us to go to 680.26.

680.26 tells me anyway that, it is not required, with non conductive pool or spa material.

680.26 (A) (1) tells me in the first sentence that bonding to conductive shells shall be provided.

second to last sentence tells me that:
Vinyl liners and fiberglass composite shell shall be considered to be nonconductive material.

I haven’t hooked up any metal hot tubs,
or built in the ground, gunite type pool that by its nature is conductive.

Probably anyone of us could go take a test and pass an inspectors exam, if they so desired.
I suppose that in the end it is up to the AHJ.
And the new guy will call it one way and we may argue the point or not. If so then you get the chief inspector involved and make the final call.

I am neither.
 
OK Sparky 93 said:
Is not all of the perimeter bonding required with conductive pool material, not nonconductive pool material?

680.42 covers outdoor spas, hot tubs. It does not describe the material of the spa.
Since we are talking about equipotential bonding it tells us to go to 680.26.

680.26 tells me anyway that, it is not required, with non conductive pool or spa material.

680.26 (A) (1) tells me in the first sentence that bonding to conductive shells shall be provided.

second to last sentence tells me that:
Vinyl liners and fiberglass composite shell shall be considered to be nonconductive material.

I haven’t hooked up any metal hot tubs,
or built in the ground, gunite type pool that by its nature is conductive.

Probably anyone of us could go take a test and pass an inspectors exam, if they so desired.
I suppose that in the end it is up to the AHJ.
And the new guy will call it one way and we may argue the point or not. If so then you get the chief inspector involved and make the final call.

I am neither.
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No, the perimeter bonding is in the earth not connected to the corners of the tub. Encircle the tub with #8 wire 18-24" from the tub and bury it 4-6" deep.


680.26(B) (2)b) Alternate Means. Where structural reinforcing steel is
not available or is encapsulated in a nonconductive compound,
a copper conductor(s) shall be utilized where the following
requirements are met:
(1) At least one minimum 8 AWG bare solid copper conductor
shall be provided.
(2) The conductors shall follow the contour of the perimeter
surface.
(3) Only listed splices shall be permitted.
(4) The required conductor shall be 450 mm to 600 mm
(18 in. to 24 in.) from the inside walls of the pool.
(5) The required conductor shall be secured within or under
the perimeter surface 100 mm to 150 mm (4 in. to 6 in.)
below the subgrade.
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