Making an Under Water Light Cable Joint | Andy's Answers 

Thanks for this video! You just saved me $600 by allowing me to replace a fountain pump easily myself without dismantling the fountain as the "professional" fountain company was planning to do to install a new pump. I used the same technique to replace the underwater pump that sits at the base of a large yard fountain. Cut the old pump cord and the new one, hooked the wires together with couplers, then heat shrink cover sealed the connection. Much appreciated.

The inside of marine heat shrink has the glue pre-coated on the inside. When it shrinks down some of that glue is usually squeezed out, which is what you saw in the video.

Gday Andy. I know you made this post some time ago but people like me are still searching and using your ideas. I am about to undertake this venture (qualified electrician) and need to keep within the wiring rules we have here in Oz. Just curious as I plan in using your system but am using the following. As you are probably aware now you can purchase crimps with heat shrink already attached nowadays. Plan is to cut suitable length of waterproof heat shrink and place over one end, Offset crimps as you have shown, then heat crimp heat shrinks, Wrap in the connection in self amalgamating tape (stops any sharp edges from crimp penetrating heat shrink then place heat shrink over tape then shrink. Bit of overkill but guaranteed never to break down in water, Using a 12 volt DC system with 3 Watt LED.

Thanks for the comments Kent, glad to have been of help to you.

Great video and simply explained.

Thank you!!! This saved me a ton of trouble. I used marine shrink/adhesive butt connectors as well. My joint is probably less likely to fail than the submersible pump electrics, now.

This is great. I personally have never had good enough luck with crimps to ever want to trust them in an area that's difficult to access such as this. I prefer using solder. It takes more time but you'll never have to redo it. Just my 2 cents.

Dear sir, for additinal protection it's optional that we can silicone inside and around the sockets before covering them up with tape and heating.

Helpful. But, you lost me on the "glue" comment as I didn't see you apply any glue. Is that built-in the shrink tubing that you used?

Perfect, thank you sir!

well done

Where did the glue from the joint come from? Is it within the cable?

Thanks Andy for this video. I have bought a pool niche but not sure about the size of the cable that comes with it. I was thinking its 6mm. Please help. Thanks

mr andy doing great job thanks for upload

Hi Andy, is the heat shrink product from RS this one; RS PRO Adhesive Lined Heat Shrink Tubing

What size of shrink tubing did you use?

completely against nec code and not legal in us

Can you tell me where can source the crimps and tubing in the UK?

What size tubing for a 300W, 12V pool light? Thanks

No problem

Is this safe por a swimming pool?

This is not legal in the US for pool lights- I wish you could do it- I have tossed out so many lights because the cord was not long enough

Who else was waiting to see him getting blown across the room when he put the cable in the water tank...???😂

Underwater cable mark

Not a good idea to put your friends and families lives at risk by doing this to an underwater swimming pool light.