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Old 01-02-2020, 12:48 AM   #16
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Re: How to test pool light fixture?


Dried out and fixed itself. You need to put a new cord and cord entry seal gland on it and then replace the lens gasket. You should be good to go then.

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Old 01-02-2020, 12:54 AM   #17
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Dried out and fixed itself. You need to put a new cord and cord entry seal gland on it and then replace the lens gasket. You should be good to go then.

SD2
I have replaced the lens gasket and it has not been submerged since. I know the light should not be on without it submerged, but the guy at the pool store told me it's okay for 1 second.

Why do you think the cord needs to be replaced?

Where does the entry seal gland go? Is it...

1. Where the cord enters the fixture?
2. Where the cord goes out the back of the niche?
3. Where the cord reappears above ground?
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Old 01-02-2020, 01:00 AM   #18
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Re: How to test pool light fixture?


The sealing gland is at the back of the fixture where the cord exits. I just suggested replacing all that while you are you are at it if it's handy. If you do replace the cord, go with a #10 for the replacement. The 12 volt lamps draw 10 times the current and the old cord would be marginal at best.

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Old 01-02-2020, 01:14 AM   #19
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The sealing gland is at the back of the fixture where the cord exits. I just suggested replacing all that while you are you are at it if it's handy. If you do replace the cord, go with a #10 for the replacement. The 12 volt lamps draw 10 times the current and the old cord would be marginal at best.

SD2
The sealing gland is inside this nut?

You're saying I can put in a 12volt light inside this fixture, but I need the transformer first, right?
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Old 01-02-2020, 02:35 AM   #20
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Dried out and fixed itself. You need to put a new cord and cord entry seal gland on it and then replace the lens gasket. You should be good to go then.

SD2
I once again tried to hook it up to a gfci and switch. The gfci tripped once again.
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Old 01-02-2020, 12:00 PM   #21
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Re: How to test pool light fixture?


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You're saying I can put in a 12volt light inside this fixture, but I need the transformer first, right?
You sure can. Shop around for an LED version so the transformer won't have to be of a very high VA rating. Basically you just have to make that fixture water tight if it isn't already.

12 Volts bulb examples

Transformer Example

Last edited by surferdude2; 01-02-2020 at 12:05 PM.
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Old 01-02-2020, 04:42 PM   #22
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Re: How to test pool light fixture?


If yours is like mine, the inside near the socket is potted...and you may see a small device embedded in the potting. I believe this is a PTC (positive temperature coefficient) thermistor. If it gets too hot, it'll cut off power to the lamp. It'll have a very low resistance when cold.
That's the reason for not running it long out of the water...the water helps keep it cool.
As I've found, surferdude is pretty knowledgable...so if you can go low voltage, it's not a bad idea...
But if you want to try another test, try replacing the gfci outlet...I haven't delved into why as yet, but they do seem to get more sensitive over time...also, gfci circuits don't really play well with long cable runs...I believe this has to do with the cable capacitance...the hot line has to charge up the cable capacitance and draws current before the neutral line has any return current...
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Old 01-02-2020, 05:29 PM   #23
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If yours is like mine, the inside near the socket is potted...and you may see a small device embedded in the potting. I believe this is a PTC (positive temperature coefficient) thermistor. If it gets too hot, it'll cut off power to the lamp. It'll have a very low resistance when cold.
That's the reason for not running it long out of the water...the water helps keep it cool.
As I've found, surferdude is pretty knowledgable...so if you can go low voltage, it's not a bad idea...
But if you want to try another test, try replacing the gfci outlet...I haven't delved into why as yet, but they do seem to get more sensitive over time...also, gfci circuits don't really play well with long cable runs...I believe this has to do with the cable capacitance...the hot line has to charge up the cable capacitance and draws current before the neutral line has any return current...
So maybe this fixture will work fine if I submerge it first?

I'm scared to try plugging it in to a regular outlet.
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Old 01-03-2020, 07:28 PM   #24
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Any advice on pulling this wire out? I'm going to replace the fixture. I have as much lube as possible on both ends. Tried pulling both ways. It moved a little, but now won't budge.
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Old 01-03-2020, 08:00 PM   #25
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Re: How to test pool light fixture?


I've been there and had it done. I had to give up and call a local pool company. It was nothing new to them. They sent a guy out with a small tank of co₂ and he hooked it up to the rigid conduit via some type of line he used and then took cover behind the pool heater and turned the valve on. The cord blew out and landed near the other end of the pool!

In my case, the rigid conduit had a threaded end to hook the co₂ up to.

I've always wondered if I could have used some sort of drill auger to grind the cord to bits but never got the chance to try it. Perhaps you can come up with something.

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Old 01-03-2020, 08:03 PM   #26
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I've been there and had it done. I had to give up and call a local pool company. It was nothing new to them. They sent a guy out with a small tank of co₂ and he hooked it up to the rigid conduit via some type of line he used and then took cover behind the pool heater and turned the valve on. The cord blew out and landed near the other end of the pool!

In my case, the rigid conduit had a threaded end to hook the co₂ up to.

I've always wondered if I could have used some sort of drill auger to grind the cord to bits but never got the chance to try it. Perhaps you can come up with something.

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Maybe I could pour baby oil down the conduit.

One problem I see from trying the CO2 method is that there's a bonding wire in that conduit I'd like to keep.
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Old 01-03-2020, 08:12 PM   #27
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Re: How to test pool light fixture?


I would even try connecting a water hose up to it and leaving it under pressure in hopes of it eventually running out the other end. If it did, leaving it longer might loosen it up. If you can get some flow started, then use a Hudson sprayer with soap solution in it to force some lube in it.

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Old 01-03-2020, 08:13 PM   #28
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Re: How to test pool light fixture?


Removing the bonding wire may actually free up the cord. Try moving it to see if it gives.

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Old 01-03-2020, 09:29 PM   #29
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I would even try connecting a water hose up to it and leaving it under pressure in hopes of it eventually running out the other end. If it did, leaving it longer might loosen it up. If you can get some flow started, then use a Hudson sprayer with soap solution in it to force some lube in it.

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I tried spraying a hose into the "above ground end". I didn't see anything come out the "pool end."

I flattened out a fish tape and couldn't even get it in the conduit through the "pool end" past the putty or whatever is at the back of the niche. I could get a fish tape through the above ground end until it stops, which may be at the pool end.

The putty, or whatever is there in the pool niche, is hard as concrete. Perhaps it will need to be chipped away. I haven't tried tugging at the bonding wire yet, but I wouldn't give it much hope.
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Old 01-03-2020, 09:39 PM   #30
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Re: How to test pool light fixture?


There's no telling what someone may have put in the pool end of the conduit in hopes of sealing it. It doesn't call for anything but that wouldn't stop anyone who thought they knew better.

If you tug on the ground wire, do it at the pool since that may actually pull whatever was caulked in there out. Here's a clip I found by Googling...


<snippet> I installed my spa light without incident and the length of the spa cable turned out to actually be longer than the pool cable. Initially, I had difficult pulling the spa cable, but followed the advice to remove the grounding cable first. I tied a string to the grounding wire and pulled easily. Once I accomplished that, the spa light cable came out easily. I then used a fish tape which easily moved through 1" conduit and attached the new cable. It wasn't easy, but it worked. I used the same string to very easily pull the grounding wire back through the conduit! <snippet>
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