Section 680.22(B)(4) permits luminaires to be in-
stalled within 5 to 10 feet horizontally of the pool?s edge
only where a ground-fault circuit interrupter (GFCI)
protects the luminaires. Since low-voltage landscape
luminaires are supplied by a low-voltage power supply,
such as a transformer, providing GFCI protection on
the primary side of an isolation transformer will not
provide GFCI protection on the secondary side.
GFCI
devices will not operate at the 15-volts or less supplied
by the secondary of the power supply. this leaves only
two options: one is to locate all low-voltage landscape
lighting at least 10 feet from the pool or fountain edge;
or, two, to use a special power supply.
There are low-voltage lighting power units that are
marked ?For Use with Submersible Fixtures or Sub-
mersible Pumps.? In this case, a special transformer is
used that complies with the requirements in 680.23
for underwater luminaires installed below the normal
water level of the pool.