New member here! Need help wiring double smart switch in single gang for pool lights

CrystalRiver

Well-known member
Jun 19, 2020
375
Massachusetts
Green is ground. Black is hot, blue and yellow are loads.

You need to pull a whole new cable from the panel all the way to the box. That is the only way to add a neutral. Or, look for smart switches that do not need a neutral.
 

NCMike

Gold Supporter
Jan 31, 2020
100
Raleigh, NC
Your assumptions are probably correct except Green = Ground. But I never assume when I am replacing switches with smart switches. Get a cheap multimeter and verify everything. Where does that conduit go? Lucky for you the wire is in conduit and if the other end of it is at the circuit breaker, pulling a new wire with a neutral should be easy. Or look into switches that don't need a neutral. If you can't find a single gang smart switch that has two switches in it, replace that single gang box with a double gang and get two smart switches. You have options.
 

Dirk

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Nov 12, 2017
8,240
Central California
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Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Nope. The multi-meter test is the best idea, but currently the pictures indicate otherwise. Of course anything could be done with wiring, right or wrong, but in this case, chances are:

Blue = Live wire (line)
Black = Load
Yellow = Load
Green = Ground (not neutral)

Take a closer look. The blue wire is common to both switches. That's the hot (line). The black wire is one load, the yellow the other.

You were "not wrong" to assume black is hot. It should have been wired that way. But the electrician chose to use a non-standard color scheme, for who knows why. If possible, when rewiring this get up, you could correct that, at the other end.
 
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Dirk

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Do you actually need manual control of both circuits at that location? You could convert one of those wires to a neutral (at the other end of the conduit) and install one single-gang smart switch at the end shown, and a second single-gang smart switch at the other end.

Otherwise, you can securely tie a rope to one end of all four wires, pull all four out of the conduit, add a fifth wire to the bundle (white) and use the rope to pull it all back through. Use wire-pulling lube on the way back to ease the task.

You could try to pull two wires through the conduit using just one existing wire, but chances are the existing four are wrapped around each other somewhere along the way. Pulling all four out will likely be less frustrating...

But... the electrician used solid copper instead of stranded. Stranded is generally used because it's easier to pull. And that solid looks to be 12 gauge, which will make the pull all that much harder. You might consider replacing all that with stranded, when you pull the neutral.

And if you decide to do that, be sure to use wire that is rated for wet locations. There are (at least) two different types of stranded wire. The wet-location variety would be better for this application. Here's a good read about it:

 
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ajw22

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Jul 21, 2013
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Blue = Live wire (line)
Black = Load
Yellow = Load
Green = Neutral
Green is ground, not neutral.

Never use a ground as a substitute for a neutral.

You need to pull a neutral to use the smart switch.
 

Dirk

Gold Supporter
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Nov 12, 2017
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Central California
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12300
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Good catch, yes, I copy/pasted the OP's text. Corrected. Green is definitely being used as a ground in the existing wiring. As I indicated, the OP needs to pull a fifth wire, to use as the neutral.
 

ajw22

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When non-standard colored wires are used a good electrician wraps the correct color electrical tape around the wire to indicate it’s usage.

Black electrical tape should be wrapped around the blue wire.

Red electrical tape should be wrapped around the black wire.

If any other color then white is used for a neutral line then white tape should be wrapped on the end of the wire.
 

ajw22

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Jul 21, 2013
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Northern NJ
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Where is the GFCI for the pool lights?

You need to be aware of the GFCI wiring to get the neutral and smart switch wiring correct so it works with the GFCI.

Pulling a neutral is not sufficient. You need to connect the neutral of the light to the smart switch to make the GFCI happy. This is where using those switches with pool lights can become difficult.