How do I make a waterproof 120 V splice underground

[sweettractors]

I have a 5 Yardlight that is on a GFI and just before I get to the light I have a underground splice that goes up and through the center of the concrete foundation to the Eye and Lights.. For years that 120V GFI connection has gave problems due to moisture around the connection. Is there a small device available that I can make up my connections, enclose them and have them be waterproof once and for all? Ken Sweet

 

[DaveOmak]

Water well wiring splices. They heat shrink and have a sealer in them also.

 

[k0ua]

these:

Tyco Electronics PowerGel Wraparound UF Splice Kit, 1/Clam - CPGI-GELWRAP-UF-250-UL at The Home Depot

or these:

Flotec Wire Splice Kit, Submersible - TC2172 at The Home Depot



James K0UA

 

[sweettractors]

Thanks a million. You guys are the best. I may be able to get this project finished today. Ken Sweet

 

[TheGoose]

I used to just use good quality electrical tape. 3M brand, forget which type but it's like $5/roll.

Use a bare butt-connector and good quality crimpers. Crimp it good. Hold the line tight, have somebody hold it while you tape. Start right at the splice, round and round, back and forth. Make sure the tape lays flat and is tightly wound. When you've got a nice little taper that goes from wire to 2-2.5x the diameter of the wire then back down it's probably good. Mine will hold 100+ feet underwater.

You can buy a heat-shrink kit also if you have the heat gun etc. The tape method always worked well for me.

Good luck.

 

[Brad_Blazer]

Self-fusing silicone tape is another option.
Nashua Tape Stretch and Seal Silicone Sealing Tape, 1 In. x 10 Ft., Black - 684201 at The Home Depot

If the UF jacket has longitudinal grooves, it's hard to get a good seal with any type of tape. Adding a little liquid silicone around the jacket under the tape will solve that.

 

[podagrower]

these:

Tyco Electronics PowerGel Wraparound UF Splice Kit, 1/Clam - CPGI-GELWRAP-UF-250-UL at The Home Depot

or these:

Flotec Wire Splice Kit, Submersible - TC2172 at The Home Depot



James K0UA

These are quite good and typically problem free.

There is also 3M Scotchcast epoxy splice (about $35 each), which will survive just about anything.

 

[Chilly807]

We've used ordinary butt connectors filled with wet RTV silicone before the wires were put in place and crimped. When it cured it was 100% waterproof.

That was for 12v stuff, 120v might not meet building code, so be careful.

Sean

 

[tommu56]

Don't Rube Goldberg it use a uf splice kit

gb brand

3m version

tom

 

[sweettractors]

Here is what I have been using, It is a hollow compression type isolator that eventually lets water in after a few months. I could not find the Tyco Powergel Wraparound in stock at Home Depot or online anywhere. I did find it on Ebay and may consider that one. The silicone tape sounds like interesting. Ken Sweet