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Waterproof underground wire splice

Old 03-30-2017, 05:38 PM
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Default Waterproof underground wire splice

I tore out a deck in my backyard and found some old electrical boxes and wiring. Everything looked old and the box seals failed so the connections were very corroded and the boxes were filled with sand. I dug up the wires and traced them and tested them and they appeared to be old dead wiring so I cut them and removed them. One of them went under the concrete pool deck and I found out the hard way it powered the pool light that operates at 14 volts. I only tested for 110. I need to replace the wire and splice it underground and then that whole area is getting covered with pavers. I might be able to put an aboveground box on the house to fix it but I'm not sure yet. If it has to be buried what's the best way to fix this?
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Old 03-30-2017, 05:44 PM
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Electrical Supply stores sell underground splice kits.
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Old 03-30-2017, 05:46 PM
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The splice crimped and heat shrunk, I would put in a sealable junction box and fill with a non hardening pourable rubber like substance.

Maybe the stuff advertised on TV...Flex Seal
http://www.acehardware.com/product/i...8-a0758faa4faa



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Old 03-30-2017, 05:46 PM
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Lowes and h d got underground splice kits
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Old 03-31-2017, 02:42 AM
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A heat sleeve, also may want to look into a wire with underground coating on it.
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Old 03-31-2017, 03:08 AM
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For low voltage all you need is a DBY,
google 3Mdby or dbry.
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Old 03-31-2017, 03:31 AM
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Thank you all. I got up early and went out and looked things over and I think there is enough wire to reach an aboveground box mounted on the house. I don't love this idea but I'm worried about an underground connection that will be buried under sand and pavers.
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Old 03-31-2017, 06:52 AM
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These work well. Inline Resin Power Cable Splice Kit

http://www.graybar.com/store/en/gb/s...FQO1wAodOeEAIg
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Old 03-31-2017, 07:01 AM
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Originally Posted by 38P6 View Post
Thank you all. I got up early and went out and looked things over and I think there is enough wire to reach an aboveground box mounted on the house. I don't love this idea but I'm worried about an underground connection that will be buried under sand and pavers.
Use a submersible well pump splice kit. Or, since we're on a boating site, wire nuts filled with 5200.
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Old 03-31-2017, 07:17 AM
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I need to do this also, but 240V on 8-ga wire.
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Old 03-31-2017, 07:18 AM
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Cover it with Schotchkote.
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Old 03-31-2017, 07:54 AM
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So you are all saying you would feel completely safe with a waterproof connector underground if I can never get to it again?
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Old 03-31-2017, 08:00 AM
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Never is a long time. If you are worried about it you could put conduit down to run the line through. I would just use the correct connection and call it good.
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Old 03-31-2017, 08:07 AM
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Originally Posted by Fish Haid View Post
I need to do this also, but 240V on 8-ga wire.
see post #8 these kits are what airports use on underground splices powering their lights. A huge high amp system. For 12v low voltage maybe overkill but I will guarantee they will not leak.
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Old 03-31-2017, 12:52 PM
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Originally Posted by mikeloew View Post
These work well. Inline Resin Power Cable Splice Kit

http://www.graybar.com/store/en/gb/s...FQO1wAodOeEAIg
Something like this but bigger we used to use on 1500 pairs or more under airport runways and would work perfectly...
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Old 03-31-2017, 05:56 PM
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If you can free up enough wire from the pool light to make the junction above ground, do it that way. In an exterior rated junction box.
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Old 03-31-2017, 06:04 PM
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Anything that isn't air tight will leak sooner or later.

If you want air and water tight forever, you're not going to find it at Home Depot , lowes , or on Amazon
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Old 03-31-2017, 06:21 PM
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Tons of good advice. Choose wisely and ignore my advice.

What I would do is - go to your bathroom and find that plastic box of floss your dentist gave you on your last visit that you have not used. Take out the floss and cut out an outlet for the wires. Use some good wire nuts on your wire and pack the floss box full of vaseoline. Jam those wires in that box and bury it.

Works for the underground dog fence.
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Old 04-01-2017, 01:22 PM
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Originally Posted by 38P6 View Post
I tore out a deck in my backyard and found some old electrical boxes and wiring. Everything looked old and the box seals failed so the connections were very corroded and the boxes were filled with sand. I dug up the wires and traced them and tested them and they appeared to be old dead wiring so I cut them and removed them. One of them went under the concrete pool deck and I found out the hard way it powered the pool light that operates at 14 volts. I only tested for 110. I need to replace the wire and splice it underground and then that whole area is getting covered with pavers. I might be able to put an aboveground box on the house to fix it but I'm not sure yet. If it has to be buried what's the best way to fix this?
I would not bury a junction box. Is the wire in conduit?
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Old 04-01-2017, 07:06 PM
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Originally Posted by Seacat FL View Post
I would not bury a junction box. Is the wire in conduit?
Some was and most wasn't. I decided to mount a waterproof box aboveground on the house.
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