Hot tub

[blueheels2]

I’m wiring a hot tub that is being recessed into an elevated deck. By being recessed I’m required to create the equipotential bonding ring around the tub. Anyone ever had to do this. Realistically what is the point on a wooden structure?

I wasn’t there on rough in but it appears the inspector was saying to the carpenter that I’ll have to bond all the metal under the tub, joist hangers, galvanized bolts, etc. To which my reply was how. If I drill and tap the hangers that voids their warranty.

Job already got interesting. Customer didn’t want to see the disconnect so I mounted the disconnect and a separate panel below (to house the shunt trip) and put a small e-stop on the deck.

What have you guys done in the past?

Thanks

 

[Dennis Alwon]

You have to bond all metal Parts within 5 ft of the tub joist hangers are not considered necessary to bond that's just ridiculous. But if you're wondering why a deck wooden deck is or could be dangerous try holding a hot wire and stand on a wet deck and tell me what you feel you'll get the idea

 

[Dennis Alwon]

What code cycle are you on because that will depend on what the equal potential bonding will need. 2017 and maybe even the 2020 you need a number 8 while I run 18 to 24 inches from the edge of the tub four to six inches below subgrade I assume the tub will be sitting on some concrete slab so it would be beyond the slab probably

 

[blueheels2]

But what is the mechanism of safety? Theoretically a bare copper wire on the underside of the deck makes all of the wooden deck memebers the same potential as the decking boards? Do you have to make loops on the underside of the decking boards? Or is attached to the joists enough?

 

[blueheels2]

What code cycle are you on because that will depend on what the equal potential bonding will need. 2017 and maybe even the 2020 you need a number 8 while I run 18 to 24 inches from the edge of the tub four to six inches below subgrade I assume the tub will be sitting on some concrete slab so it would be beyond the slab probably

No the tub is on an elevated deck with different levels. Tub is 10’ off the ground to the bottom of the joists. Surrounding decks are at the top of the tub. They built an elevated platform at the access panel that is accessible with removable floor panels on the surrounding deck.

And I’m in NC so it’s the 2017.

 

[Dennis Alwon]

No the tub is on an elevated deck with different levels. Tub is 10’ off the ground to the bottom of the joists. Surrounding decks are at the top of the tub. They built an elevated platform at the access panel that is accessible with removable floor panels on the surrounding deck.

And I’m in NC so it’s the 2017.

I assume that was the case sorry that it didn't read that way. I just assumed you would have to crawl under to have access to the motor but sure you can make it accessible from pulling the deck boards up still need to do the equal potential bonding though

 

[blueheels2]

The lower platform is in the middle on the right.

 

[Dennis Alwon]

So the tub is located in the back right of the picture where light can be seen coming thru the deck? It seems odd but you still need the equipotential bonding. I did one that was similar in that it was about 15 feet in the air. I had to do the equipotential bonding.

If he is insisting on bonding the joist hangers then he is overthinking this rule. The equipotential bonding is bonding the wood which in turn is bonding the joist hangers. I would go over his head to the state if he insists