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E4104.5 Bonding of Indoor Hot Tubs and Spas
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The following parts of indoor hot tubs and spas shall be bonded together:
- All metal fittings within or attached to the hot tub or spa structure.
- Metal parts of electrical equipment associated with the hot tub or spa water circulating system, including pump motors.
- Metal raceway and metal piping that are within 5 feet (1524 mm) of the inside walls of the hot tub or spa and that are not separated from the spa or hot tub by a permanent barrier.
- All metal surfaces that are within 5 feet (1524 mm) of the inside walls of the hot tub or spa and that are not separated from the hot tub or spa area by a permanent barrier.
Exceptions:
- Small conductive surfaces not likely to become energized, such as air and water jets and drain fittings, where not connected to metallic piping, towel bars, mirror frames, and similar nonelectrical equipment, shall not be required to be bonded.
- Metal parts of electrical equipment associated with the water circulating system, including pump motors that are part of a listed self-contained hot tub or spa.
- Electrical devices and controls that are not associated with the hot tubs or spas and that are located less than 5 feet (1524 mm) from such units.
All metal parts associated with the hot tub or spa shall be bonded by any of the following methods:
- The interconnection of threaded metal piping and fittings.
- Metal-to-metal mounting on a common frame or base.
- The provision of an insulated, covered or bare solid copper bonding jumper not smaller than 8 AWG. It shall not be the intent to require that the 8 AWG or larger solid copper bonding conductor be extended or attached to any remote panelboard, service equipment, or any electrode, but only that it shall be employed to eliminate voltage gradients in the hot tub or spa area as prescribed.
Connections shall be made by exothermic welding or by listed pressure connectors or clamps that are labeled as being suitable for the purpose and that are made of stainless steel, brass, copper or copper alloy. Connection devices or fittings that depend solely on solder shall not be used. Sheet metal screws shall not be used to connect bonding conductors or connection devices.
Related Code Sections
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The following parts of indoor hot tubs and spas shall be bonded together:
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