120V to 12V question

Question is, do I go with option 1, 2, or 3 for the existing wiring im using to power the 12V light from the breakerbox/gfci.

I have lost track of where those options are listed.
 
I think all three options are electrically the same. Verify if there is any difference using a multimeter.
 
I care more that the light ground is electrically connected to the J-Box that should connect it to the bonding wire.

Intermatic does not show a wiring diagram for the transformer and I am not sure exactly what that ground from the transformer connects to. If I had it in my hands I would look at it and test it with a multimeter to decide what the best connection is.
 
I care more that the light ground is electrically connected to the J-Box that should connect it to the bonding wire.

Intermatic does not show a wiring diagram for the transformer and I am not sure exactly what that ground from the transformer connects to. If I had it in my hands I would look at it and test it with a multimeter to decide what the best connection is.
It just happened to come in today and has a wiring diagram printed on it. It’s pretty simple--the 120v line voltage comes in to black, neutral to white, ground to the ground bus. Then on the output side, red and yellow out to the light for 12V service. Pictures are attached.
 

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Then connect the transformer ground to the ground bus in your electrical panel and not to the J-Box.
 
Then connect the transformer ground to the ground bus in your electrical panel and not to the J-Box.

Yes I was planning to do that all along, connect the ground from the 120V feed to the transformer's bus. What I was wondering: In order to carry the 12V feed from the transformer to the light/J-box, I'm re-using the existing/old 120V wiring that has a black, white, and ground. I'm using the back and white for the 12V, and I was wondering if I should also connect the ground for the heck of it, or just leave it disconnected and capped. It sounds like disconnected and capped is the right answer here, right?
 
Yes I was planning to do that all along, connect the ground from the 120V feed to the transformer's bus. What I was wondering: In order to carry the 12V feed from the transformer to the light/J-box, I'm re-using the existing/old 120V wiring that has a black, white, and ground. I'm using the back and white for the 12V, and I was wondering if I should also connect the ground for the heck of it, or just leave it disconnected and capped. It sounds like disconnected and capped is the right answer here, right?

Yes.
 

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Been following this thread as I had converted all my 120V lights to 12V LED via transformers (niches and j-boxes are bonded properly). I did connect the ground wire all the way back to the ground bus in the subpanel as this is what is shown for 12V LED fixtures bought new. See, for example, the wiring instructions that comes with Jandy 12V Watercolors LED. I was thinking since the new fixtures come with 3 wires, including the ground connected to the ground bus, I would do the same. Should I cap the ground coming from the J-box instead as recommended in this thread?
Screenshot 2021-06-30 084804.jpg
 
Been following this thread as I had converted all my 120V lights to 12V LED via transformers (niches and j-boxes are bonded properly). I did connect the ground wire all the way back to the ground bus in the subpanel as this is what is shown for 12V LED fixtures bought new. See, for example, the wiring instructions that comes with Jandy 12V Watercolors LED. I was thinking since the new fixtures come with 3 wires, including the ground connected to the ground bus, I would do the same. Should I cap the ground coming from the J-box instead as recommended in this thread?
View attachment 350730

Oh wow that manufacturer-supplied wiring diagram is probably gospel then I would think. I added to another thread on this too linked below. Also the electrician from Florida Sunseeker might be calling me later, if I talk to him I'll post back.
 
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The Hayward is interesting because, unlike the Jandy, it doesn't seem like there is a ground wire coming from the fixture, only the bonding wire in the conduit. I read the manual and it still isn't clear. I looked at the Pentair Intellibright manual and they specifically state to connect all 3 conductors, which I assume includes a ground, though they don't provide a detailed schematic. Will be interested to see what the Florida Sunseeker electrician has to say since they are one of the leaders in the aftermarket bulb conversion. Unfortunately, they don't make a replacement bulb version that emulates the Jandy Watercolors so I had to go with J&J. I looked up J&J fixtures (which I don't have, just the bulbs) and they also seem to have 3 conductors that you are supposed to connect (so I assume one is a ground).
 
Found this today on pentair's website for the Amerilite product which is exactly the same as my light. I'm just going to attach the ground to the j box from the light, then leave the ground off from the j box to the transformer.
 

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