connect the source to the line side of the timer and the pump wires to the
load side of the timer. Make sure that the ground is unbroken to the pump.
(required by the NEC Code and every jurisdiction I have ever worked in)
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This is a requirement for wet niche lights. It does not apply to pumps. Use
standard wiring methods for the branch circuit to a pump. The ground does have
to be #12 copper or larger.
BTW even the wet niche rule allows a splice on the ground if it is on a bus bar
in a timer enclosure.
There is still supposed to be an 8 ga bonding wire that connects the pool
steel, ladders, lights pumps and any other metal, bigger than the palm of your
hand and within 5' of the water.
It is code in my state (NY) that a pool pump motor be grounded. My pump
motor is grounded with a double green coated wire to a steel stake
driven into the ground. If you look at your pump motor, you will find a
tab somewhere on the motor that will accept the ground wire and has a
set screw to secure a good contact for the ground wire.
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