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Thread: Bonding Aluminum Coping

  1. Back To Top    #1

    Join Date
    Aug 2013
    South Carolina

    Bonding Aluminum Coping

    Hi. A little background...after converting my pool to SWG in 2013, my pool developed a 1 - 1.5 volt potential difference between the Aluminum coping, ladders, and the pool itself. To troubleshoot, I mechanically disconnected all power from the pump, SWG, and light...the voltage remained. The local power company came out to determine if there was an underground power leak. After disconnecting my transformer and two of the neighbors transformers, they could find nothing. They cleaned, and replaced several ground connections and bonding connections, but they found nothing.

    Three years later, the 1 - 1.5 volt shock remains. I took care of the ladder issues by replacing my stainless with polymer ladders. The only remaining point of shock is the aluminum coping. My plan is to remove sufficient concrete from the coping, to attach a copper grounding wire to the coping with a stainless bolt, cover the connection with silicone, patch the concrete, and connect this wire to the bonding wire from the pool. As a last step, I'll mechanically join each section of coping with stainless screws.

    Thoughts? I don't see that I have any other options short of tearing out all of the decking, and having the bonding redone.
    20' x 40' inground vinyl 33k gallons
    Hayward 1hp Super Pump
    Hayward 30 inch Sand filter
    Polaris 360
    Intellichlor IC60 SWG

  2. Back To Top    #2

    Join Date
    Apr 2013
    Sacramento, CA

    Re: Bonding Aluminum Coping

    So you have a voltage differential at the pool even with the main house power turned off. And the PC could find nothing. Not fun.

    Don't use a stainless bolt and don't cover with silicone. Use either a split bolt or a clamp. Bury directly in concrete or mortar.

    Shop Blackburn 0.235-in Copper Split Bolt at

    Shop Blackburn 2-Count Copper Lugs at

    Shop PRO-FLEX Brass CSST Bonding Clamp at

    So another suggestion is to get a saw cutter and cut a line around the pool about 3 to 4 inches beyond the coping and put a #8 bare copper wire in there and tie it to the coping and to a water bond in the skimmer for example. Try and make it look decorative. The copper line only has to be an inch or so deep in the deck. Backfill with mortar. That should give you a reasonable deck bond under the circumstances any should eliminate the voltage differential. If it were me I would have two water bonds and two copper lines around the pool in the deck because you have an existing voltage differential.
    Tying the deck to the water is the most important thing you can do.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Heliocol solar panels, Polaris 360 supply side cleaner, waterfall

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