Nickie,
When we do a grounding grid in our line of business, all is tied together and referenced back to the system neutral to eliminate/reduce step and touch potential in the station.
Unfortunately in this case, the code required interconnection between the electrical grounding system and the equipotential pool grounding system actually, in some cases, causes a step or touch potential. When you connect these two systems you are energizing the pool grounding grid with a voltage equal to that of the voltage drop on the utility’s multigrounded neutral. This can be a few volts and result in a tingle at the edge of the equipotential grounding system.
Many think that the fine print note after 680.26(A) says that there is no requirement to connect the pool bonding grid to the electrical grounding system, but all the note really says is that there is no requirement to extend the #8 bonding conductor to a panel.
FPN: The 8 AWG or larger solid copper bonding conductor shall not be required to be extended or attached to any remote panelboard, service equipment, or any electrode.
If the equipment is not double insulated there will be an equipment grounding conductor connected to the metal parts of the equipment and the bonding grid must also be connected to the metal parts. This results in a code required connection between the two systems. In the case of double insulated 680.26(B)(4) says.
… Where a double-insulated water-pump motor is installed under the provisions of this rule, a solid 8 AWG copper conductor that is of sufficient length to make a bonding connection to a replacement motor shall be extended from the bonding grid to an accessible point in the motor vicinity. Where there is no connection between the swimming pool bonding grid and the equipment grounding system for the premises, this bonding conductor shall be connected to the equipment grounding conductor of the motor circuit.
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