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#176882 - 04/15/08 09:13 AM
Electrical installation for outdoor hot-tub
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Ann Brush
Member
Registered: 12/27/05
Posts: 111
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A sparky here at work moonlights doing additional small time resi work. He asked me (I don't know why he picked me, I am just an EE) what the code requirements were for the installation of an outdoor hot-tub. I know there have been posts on this topic (disconnect locations, GFCI requirements etc), please could some of you point them out to me with the relevant code sections if you have them handy.
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#176883 - 04/15/08 09:23 AM
Re: Electrical installation for outdoor hot-tub
[Re: Ann Brush]
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renosteinke
Cat Servant
Moderator
Registered: 01/22/05
Posts: 3100
Loc: Reno Nv USA
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Article 680, which covers pools, has a 'spa and hot tub' section that modifies the pool rules.
It's a good idea that he also check with the local town, as local interpretations - especially regarding whether the ground wire need be insulated - vary. It's possible the town will want an insulated ground wire all the way back to the main panel ... which rules out NMC as a wiring method.
If there's a gazebo over the thing, a ground rod, in addition to the ground wire, is also a good idea. Again, this is a matter of some discussion.
Wires need to be buried deep - preferably 2 ft down. Getting into design issues, I prefer pipe. These steps protect against the gardener damaging them when working on the lawn sprinklers.
Finally, there is the matter of disconnect location. Putting it in the enclosed area that also hides the air conditioner is a common error. An "emergency stop" is not required for residential tubs.
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#176891 - 04/15/08 11:21 AM
Re: Electrical installation for outdoor hot-tub
[Re: gfretwell]
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renosteinke
Cat Servant
Moderator
Registered: 01/22/05
Posts: 3100
Loc: Reno Nv USA
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Thank you, Greg, for highlighting some common variations.
I've seen countless variations ... as well as quite a bit of variety in the tubs themselves. The last one I did came with its' own "slab," made of something resembling styrofoam, but looking like cement!
All more reasons to have a chat with the AHJ before work starts ....
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#176919 - 04/16/08 08:04 AM
Re: Electrical installation for outdoor hot-tub
[Re: macmikeman]
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harold endean
Member
Registered: 02/16/02
Posts: 1047
Loc: Boonton, NJ
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Greg,
Someone mentioned disconnects, and emergency disconnect is not required for resi spas, but a disconnect for the motors is still required to be within 50 feet and within eyesight of the motors, if it is not part of the spa package. As for bonding concrete on existing patios around here some EC's are installing rubber mats around the tubs or wooden decks, this way you are insulated from the concrete.
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