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Thread: Hot Tub and Ground Rod ???

  1. #1
    Join Date
    Jul 2008
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    North Of Tampa Fl
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    Hot Tub and Ground Rod ???

    My old electrician buddy just installed a Portable Hot Tub on his screened porch ( 20 ft from his main house panel ). He installed a 50 amp 2 pole GFI breaker feeding it . He ran 2 #6 , 1 #8 neutral , and 1 #10 ground to it . He took the ground wire to the small ground bar on the side of the hot tub control box inside the tub per the instructions . He then took a #10 from the hot tub ground bar to a ground rod outside ( he added the ground rod just for the hot tub ) and then to his screen porch meal framing . I understand bonding the metal screen framing as it is about 2 ft from the spa . What I have a question about is the ground rod . He told me the guys that dropped off the hot tub told him the county requires the ground rod . I didn't see a code requirement for a separate ground rod and wondered is this normal ?

  2. #2
    Join Date
    Jun 2003
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    Hard wiring a portable hot tub would not be normal in my thoughts.

    Ask the local AHJ why they want the rod.

    Delivery guys may not be the source to rely on for code requirements.
    Tom
    TBLO

  3. #3
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    Jul 2008
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    North Of Tampa Fl
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    As far as portable its about 8ft x 8ft I was told 2 guys delivered it . It has a control box within the hot tub for wiring directly to the unit . I plan on asking the county about this to see what they say ..

  4. #4
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    Quote Originally Posted by Davebones View Post
    As far as portable its about 8ft x 8ft I was told 2 guys delivered it . It has a control box within the hot tub for wiring directly to the unit . I plan on asking the county about this to see what they say ..
    Not all peoples definition of portable is the same I guess.

    My two story Victorian house was raised up and moved 30'. I guess that made it portable.
    Tom
    TBLO

  5. #5
    Join Date
    Feb 2003
    Location
    Seattle, WA
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    19,197
    This is no different than running a 50 amp circuit to a heat pump that you install on your back porch. The wires from the circuit breaker to the unit constitute a branch circuit. That circuit has an EGC. You are done. No ground rod is needed. Even if you install this portable hot tub in the yard, rather than on the porch, you still would not need a ground rod. Reference the exception to 250.32(A).
    Charles E. Beck, P.E., Seattle
    Comments based on 2017 NEC unless otherwise noted.

  6. #6
    Join Date
    Mar 2008
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    Michigan. It's a beautiful penninsula, I've looked around.
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    10,119
    Wouldn't a ground rod at the hot tub have to be bonded to the rest of the electrode system with something larger than a #10?
    Cheers and Stay Safe,

    Marky the Sparky

  7. #7
    Join Date
    Dec 2007
    Location
    NE Nebraska
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    38,517
    Quote Originally Posted by K8MHZ View Post
    Wouldn't a ground rod at the hot tub have to be bonded to the rest of the electrode system with something larger than a #10?
    No. This rod isn't a supplemental rod to the electrical system it is a supplemental rod to the equipment it is attached to, the EGC of the branch circuit is all that is needed to bond to the rest of the electrical system grounding/bonding.
    I live for today, I'm just a day behind.

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