Id appreciate some input on my tests. Ive often wondered whether the copper loop coming out of the ground at the equipment pad is actually connected to the pool shell or anything in the pool and there have been a few recent posts on bonding on this site. Anyway what Ive done so far is to disconnect the bond loop from the equipment and then carried out some resistance measurements. I find them not what I expected.
Bond loop to the two pool light metal trim rings 17 ohms. ( I expected 0 ohms)
Bond loop to timer box ground bar 30 ohms. (I expected 0 or close to 0 ohms.)
Bond loop to pump motor case or heater shell 30 ohms. (I expected 0 or close to 0 ohms)
I also did some measurements in other areas.
Pool metal trim rings to the pool light junction box ground wire 0 ohms. As expected.
Timer box ground bar to any pool light metal ring or the pool junction box ground 35 ohms. I find this very surprising. The motor and pool light cables all run from a common breaker box which is fed from the house mains panel. I was expecting 0 ohms.
Motor cases or heater shell to timer box ground bar 0 ohms.- as expected.
Im thinking that the bond wire definitely does not attach to the pool lights and the 35 ohm measurement between the timer box ground bar and the pool light ground is very strange. The pool is about 25 ft away from the equipment pad, the furthest pool light would be about 60 ft from the equipment pad.
thoughts, comments appreciated.