Inground Pool Light wiring 1968 pool.

[ESA1178]

Hi all!

As you can see by the photo I have a junction box that houses a bunch of wiring. I am assuming that this is to facilitate the pool light and something else in the past. This is also where the diving board sat.
There are 3 conduits. The center probably goes to the light, since it is B/W/G.
The others I am not sure about. Obviously one has to be a source. They are both BL/W/Y/B/G.
I just had the pool re plastered and cement deck partly replaced. During the removal of the old cement, it was found that the old wiring was encased in rusting black iron (go figure). I told the guys to remove it. Now I am going to cut a 3 inch wide section of the old cement, leading from this box to the bedding area (about 6 feet.) Then I am going lay conduit to the main panel. My questions is, what gauge wire should I be using to pigtail with the B/W/G? And also what breaker/fuse? Since this would be dedicated fuse/breaker, I assume on the low end.

[ PICS BELOW ]

Many thanks for all your help guys/gals.. have a great summer!

[PoolDoc]

Here are your photos:

https://lh4.googleusercontent.com/-JJCaXgf3iaM/TgEMtlA028I/AAAAAAAAARU/nYPHO8Gk6Ok/s800/IMG_0111-ed.jpg

https://lh6.googleusercontent.com/-ibusFS0mQZY/TgEMtKvgD2I/AAAAAAAAARQ/7rkxXfXS608/s800/IMG_0112-ed.jpg

[PoolDoc]

Not clear on why you are replacing the wiring --- it may not be code compliant today, but it looks like all it needed was a bond wire to be close. The "rusting black iron" was probably S-40 galvanized conduit - much less likely to leak than anything that gets installed these days. Not sure how the wires got snipped so short, but I'm glad I'm not the one trying to reconnect to that lamp cord! Trying to get a connection there that will work with an GFCI ought to be a good day's challenge for a lot of folk.

The center wire is the lamp; wire sizes depend on what else is switched or on the circuit, and also the lamp amperage (watts / volts). If I had to guess, I'd speculate that the lamp was controlled by more than one switch, in a 3-way or 4-way arrangement.

You might want to talk to an electrician who understands pool wire, pool bonding, and electrical safety in wet areas. Do a light wrong, and you'll kill somebody. If you don't get an electrician, at least run the circuit through a GFCI. That way, if the wiring is not up to snuff, you probably won't be able to keep the circuit live.

Good luck!

[ESA1178]

Thanks Ben...
I have an electrician coming over to replace the main panel to my house on monday. I will ask him when he gets here....
Will keep you informed.....

Mark