OK, Here is one for you. The above ground pool is ALL Plastic ( what do you bond to?) There is a pool motor (with a ground lug) and there is a propane gas pool heater with a bond lug. (Which should be bonded to the motor and pool) The EC was afraid to just connect the motor to the heater. He was afraid that the electric might leak back to the large propane tank. ( which BTW is connected with a copper pipe!)Plus if there was current leaking from the motor to the propane tank, and someone disconnect the "Empty" propane tank, would it go Boom? Or would it attract voltage to this large metal propane tank sitting on the ground. Any thoughts?