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Thread: Bonding questions for new jacuzzi tub

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    DIY Junior Member RobertZ's Avatar
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    Default Bonding questions for new jacuzzi tub

    Hey everyone,

    As part of my bath remodel I am installing a new jacuzzi tub and heater and understand that they need to be properly grounded and bonded with a 8 AWG solid copper conductor. Having pulled up the subfloor to plumb the new tub, I noticed a solid copper line running under the floor. As far as I can tell, this copper line is clamped to an outside galvinized pipe running into the ground and into the house and the copper line runs from there through the house over to the main panel. Assuming this is the grounding wire, could I connect the 8 AWG solid copper conductor from the tub motor and heater to the grounding wire and be good?

    P.S. I noticed that I don't have a bonding wire that connects to the pipes around the water heater or anywhere else as far as I can see. Is this something I need to have fixed or does the grounding wire being connected to the galvinized pipe take care of this issue?

    Thanks everyone for the help!

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    Electrical Contractor/Instructor jwelectric's Avatar
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    You could if you want to but it is not required. The purpose of the 8 bonding conductor is to bring everything in the area of the tub to the same potential.

    There is no requirement to bond around a water heater

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    Moderator & Master Plumber hj's Avatar
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    The only bonding required at the water heater is usually to the gas line if you have one. It IS a prudent thing to bond between the hot and cold lines at the heater. It could extend the life of the water heater.
    Licensed residential and commercial plumber

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    DIY Junior Member RobertZ's Avatar
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    Hey guys. Thanks for the help.

    I'm still a bit confused about my first question...

    Am I meeting the requirement of grounding and bonding the tub motor and tub heater if I connect the 8 AWG solid copper conductor to the grounding wire I found under the floor?

    Thanks again!

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    Electrical Contractor/Instructor jwelectric's Avatar
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    There is a big difference between grounding and bonding.
    Grounding is simply the connection to earth and is done for lightning, power surges, unintentional contact with higher voltage lines, and to keep everything stable under normal conditions.

    Bonding is done to ensure a low impedance path for fault current to follow in order to clear a fault by opening an overcurrent device

    Then we have something called equipotential bonding. This bonding is done to reduce voltage gradients in the area of a body of water such as the tub you mentioned. This bonding is not required to hit the grounding electrode or its conductor so there is no need to land it on the copper conductor you found in the floor unless you just want to do so.

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    DIY Junior Member RobertZ's Avatar
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    Hey JW,

    Thanks for the explanation. I guess I'm a little confused by the installation directions provided with my American Standard jacuzzi tub. If you look at the image below, Step 2 says to ensure the heater and pump are GROUNDED and BONDED and that they should be connected to a local bonding point. And FIG 3 shows the 8 bonding conductor from the pump going to ground.

    I just want to make sure I'm doing the connection right.

    Thanks for the help!

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