timothyjblairjr
Member
- Location
- Massachusetts
- Occupation
- Engineer
Forgive my ignorance as I am trying to understand my existing pool's electrical system.
The case is an in-ground swimming pool with an existing bonding grid and a 220V circuit from the main panel supplying power to the pool pump. The circuit contains two hot conductors and a grounding conductor that run from the main panel via conduit to a single-throw switch in a metal box that is protected with a weatherproof enclosure. From the switch, they run to an adjacent 4x4 metal box with a 20-amp twist lock receptable, also in a metal box with a weatherproof enclosure. Both the switch box and the receptable box are grounded. This is all happening at the equipment pad. The pump is fitted with a 3-foot long chord at the end of which is the mating 20-amp twist lock plug. The #8 bonding wire exiting out of the ground from beneath the pool deck is connected to the pump motor housing at a grounding lug and also spliced with an in-line zinc anode for saltwater generating system. Presumably, when the pump is unplugged, there is no longer an intimate connection between the pool bonding grid and a grounded conductor that ties back to the service. My questions is: does this matter? Should the bonding wire that is connected to the motor housing somehow also be permanently connected to the grounding conductor on the line side of the circuit, so that even if the pump is unplugged the bonding grid connection isn't lost?
The case is an in-ground swimming pool with an existing bonding grid and a 220V circuit from the main panel supplying power to the pool pump. The circuit contains two hot conductors and a grounding conductor that run from the main panel via conduit to a single-throw switch in a metal box that is protected with a weatherproof enclosure. From the switch, they run to an adjacent 4x4 metal box with a 20-amp twist lock receptable, also in a metal box with a weatherproof enclosure. Both the switch box and the receptable box are grounded. This is all happening at the equipment pad. The pump is fitted with a 3-foot long chord at the end of which is the mating 20-amp twist lock plug. The #8 bonding wire exiting out of the ground from beneath the pool deck is connected to the pump motor housing at a grounding lug and also spliced with an in-line zinc anode for saltwater generating system. Presumably, when the pump is unplugged, there is no longer an intimate connection between the pool bonding grid and a grounded conductor that ties back to the service. My questions is: does this matter? Should the bonding wire that is connected to the motor housing somehow also be permanently connected to the grounding conductor on the line side of the circuit, so that even if the pump is unplugged the bonding grid connection isn't lost?
