Need assistance with stray voltage at pool. Here's the situation. The only thing bonded at the pool was the metal pool light and the pool cover motor. The grounding of the pool light introduced the pool water to the neutral at the neutral to ground bond in the main panel. The customer complains about the 0.7 volt tingle shock. Most of the 0.7 volts is the voltage drop on the primary system as imbalance current travels back to the substation (Ohm's Law).
The problem is that the pool builder used some kind of fiberglass strands mixed in the concrete and no rebar or any equipotential plain. This appears to be a violation of NEC 680.26, since no equipotential bonding grid was installed. I had them bond the hand rail and pool cover to the cover motor chassis which eliminated the potential difference from the cover track and the water. The customer still feels a tingle at the end of the pool. Just from the concrete to pool water.
Does anybody know if this type of concrete reinforcement is allowed? What is the usual methods for adding a equipotential bonding grid if fiber concrete or epoxy coated rebar is used?