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Another objective of Article 680 is to recognize that the electrical equipment associated with the pool itself presents a greater shock hazard because people are wet.
As much as possible, electrical equipment should be located outside the area where people could be in contact with both the pool water and with something electrical at the same time. If the equipment must be in the pool area, then it requires GFCI protection, or it must be at a voltage low enough to not be a shock hazard.
Section 680.2 includes a definition of “low voltage contact limit” that was added in 2011. The maximum safe voltage for someone who is in a wet location is stated as either:15 volts RMS (root mean square) for sinusoidal AC, 21.2 volts peak for non-sinusoidal AC, 30 volts for continuous DC or 12.4 volts peak for DC that's interrupted at a rate of 10 to 200 Hz.
21.2 volts is the peak voltage of a sinusoidal 15 volt RMS system. It appears from this that interrupted DC voltage is the greater shock hazard, at least it appears to be a shock hazard at the lowest voltage.
© Hughes Associates,Inc. 2012