Grounding of Metal Near Swimming Pools and Spas

Equipment Required to be Grounded
1. Ground the following equipment:
(a) all underwater lights except low-voltage lights listed for use without grounding, and
(b) all electrical equipment within (≤) 5 feet from the inside edge of an indoor or outdoor swimming pool, spa, or hot tub, and
(c) all electrical equipment associated with the circulating system of an indoor or outdoor swimming pool, spa, or hot tub, and
(d) junction boxes and transformer enclosures, and
(e) ground-fault-circuit-interrupter (GFCI) receptacles and circuit breakers, and
(f) subpanels (that are not part of the service equipment) that serve any electrical equipment associated with an indoor or outdoor swimming pool, spa, or hot tub.

Grounding Underwater Lights
1. Ground most underwater lights that operate at more than low voltage . Use an insulated copper equipment grounding wire at least (≥) #12 AWG for circuits not more than (≤) 20 amps between the underwater light junction box and the electrical panel. Do not splice this grounding wire. This grounding wire is in addition to the #8 AWG bonding wire required for a metal forming shell.
2. Connect the underwater light’s equipment grounding wire to the grounding terminal of equipment such as a junction box, transformer, GFCI, timer switch, or snap switch when the equipment is installed between the light and the panelboard. Connect the equipment grounding terminal to the grounding terminal at the panelboard using unspliced wire.
3. You do not need to ground low voltage lights and fiber optic lights that are listed for operation without grounding.

Bonding Nonmetallic Conduit Serving Underwater Lights
1. Install an insulated copper bonding wire at least (≥) #8 AWG in any nonmetallic conduit installed between a wet-niche light and a junction box, transformer enclosure or other enclosure. Connect the wire at the junction box or enclosure and at the light’s forming shell. Protect the forming shell bonding connection with an approved potting compound that will resist the corrosive effects of the water.

Grounding Underwater Lights Supplied by Flexible Cords
1. Use a flexible cord that contains an insulated copper grounding wire as part of the cord when using a flexible cord between a junction box and a wet-niche or no-niche light. Use a flexible cord containing a grounding wire that is at least (≥) the same size as the supply wires at the junction box and is at least (≥) #16 AWG. This means that the flexible cord grounding wire for 120 volt lights should be at least (≥) #14 AWG. Connect the flexible cord grounding wire at the junction box or enclosure and at all exposed non-current-carrying metal parts of the light. This does not apply to low voltage lights and fiber optic lights that are listed for operation without grounding.

Grounding Motors
1. Install a copper equipment grounding wire between all motors associated with indoor and outdoor swimming pools, spas, and hot tubs and the grounding terminal at the panelboard. Use at least (≥) #12 AWG for motors on 15 amp and 20 amp circuits and at least (≥) #10 AWG for motors on circuits up to 60 amps. This grounding wire is in addition to the #8 AWG bonding wire required or the motor case.

Grounding Panelboards
1. Install an insulated copper grounding wire between a subpanel that supplies equipment for indoor and outdoor swimming pools, spas, and hot tubs and the grounding terminal at the service equipment or at the panelboard serving the pool panelboard. Use at least (≥) #12 AWG grounding wire for 15 amp and 20 amp panelboard feeders and at least (≥) #10 AWG grounding wire for panelboard feeders up to 60 amps.