Replacing pool light switch with timer

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  #1  
Old 08-28-15, 10:08 AM
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Replacing pool light switch with timer

It is now mounted on an outside wall and is a simple ON-OFF toggle switch. We wanted to substitute an outdoor 120v Intermatic T101R timer (or similar), so the 500w light will go on and off as we like.

I looked inside the switch and see 3 white wires, 1 black wire and 1 green wire. It feeds off of a small panel in the pool equipment room and has a GFI button.

I, myself will not do this. Probably a real electrician....Or, is this simple enough for a handyman who knows electrical ?

I am confused about SPST vs. SPDT...what do I need ?

Thank you....
 
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Old 08-28-15, 10:22 AM
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You should be able to do it yourself.

SPST=single pole single throw...... basically on or off for one 120v device.
SPDT=single pole double throw.... basically on or off for one 120v or 240v device.

Either will work fine. Just make sure it's a 120v clock motor.

I'd be expecting the black and ground but not three white wires. Is the wiring in a conduit ?
Usually a black comes paired with a white so that you seem to have too many white wires.
 
  #3  
Old 08-28-15, 01:05 PM
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Yes, wiring is in a conduit. I took the cover off the panel in the pool equipment room and looked at the 20 amp breaker. Only two white wires and one black coming out.

And no....I am not doing the change myself. I have zero experience doing electrical.
 
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