17. Pools and Fountains
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common bonding grid
A grid of metal parts that are interconnected in order to keep all metal parts in a pool area at the same electrical potential and eliminate voltage gradients.
wet-niche luminaire
A luminaire intended for installation in a forming shell mounted in a pool or fountain structure where the luminaire will be completely surrounded by water.
dry-niche luminaire
A luminaire intended for installation in the wall or floor of a pool, spa, or fountain in a niche that is sealed against the entry of pool water.
deck box
An electrical junction box that is used for connections to underwater luminaires, is constructed of corrosion-resistant material, and can be used for lighting operation at 15 volts or less.