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Swimming pool pump motor with two bonding wires connected to bonding lug

Swimming Pool Bonding

Dear Mr. Electrician:  How do I fix my in-ground swimming pool bonding? Answer:  Swimming pool bonding can be easy to fix if you know the National Electrical Code requirements.  Article 680.26 Equipotential Bonding is what is used to determine the swimming pool bonding requirements.  NOTE: Some text links below go to applicable products on Amazon. Below are photos of a commercial pool that failed inspection due to shortcomings with the swimming pool bonding. In my state commercial swimming pools are required to be inspected by a licensed electrical contractor every few years.  The required inspection is a good thing, because every time I have done a pool inspection I have found problems.  Most problems were not from the original swimming pool construction, but as a result of repairs, changes, and a lack of good preventative maintenance. Unfortunately the state has no such inspection requirements for homeowner managed swimming pools.  Consequently problems on homeowner swimming pools such as a lack of bonding are not caught unless someone working on the pool notices that something is wrong. SWIMMING POOL BONDING REPAIR This is a close up shot of the pool pump from the top of this page.  Although it does have a bonding wire connected, the lug is not approved for two wires, only one.  The photo below depicts my correction. A new tin plated copper lay-in lug was installed and the broken bonding wire was spliced together using a copper C tap and a crimping tool.  I also used copper split bolt connectors to take the strain off of the crimps. The swimming pool pump motor above has its own built-in lay-in lug and set screw. Lay-in lugs are favorable for use on swimming pool equipment because it makes it easy to replace pool equipment without having to take apart all of the bonding connections. A swimming pool heater with a lay-in bonding lug and number 8 solid copper bonding wire. The above swimming pool lighting transformers were all required to be bonded.  One of the bonding lugs had two wires in it.  That would have been okay if the lug was approved for two wires, but it wasn't. Two wires in a pool equipment bonding lug that was not approved for two wires.  My fix is below. I pulled the extra wire out of the lug and made a splice using a copper crimp and a copper split bolt connector. I used a copper C tap crimp and also a copper split bolt connector to join the wires together for a low resistance connection. The original installer installed a bonding lug on the top of the outdoor wiring trough.  It would have been better if the lug was on the bottom to keep water out, but there was probably no room to get an electric drill underneath after the lighting transformers were installed. It is acceptable to use only copper split bolt connectors for the #8 solid copper pool bonding wire.  Crimped connections are not required for pool bonding. The brackets that support the pool controls were just fastened to the concrete slab with some L...