Waterproofing a three-way wiring joint?

prv

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When I had Ariam's mast down last winter, I ran a cable for some deck lights. However, I ran out of time before the scheduled re-rigging to find some lights I liked, so the upper end of the cable is neatly coiled and taped to the underneath of the radar bracket.

I've now found and ordered some lights - retrofit boy-racer daytime running lights designed to simply be stuck to a car bumper with double-sided foam tape. Tacky as hell on the road, but the stick-on nature means they are very thin and hence unobtrusive on the undersides of the spreaders. I'll probably back up the included sticky with some sikaflex and / or epoxy.

Once they arrive I'll need to wire them up. My usual standard for permanent wiring like this is solder, plain heatshrink on the individual cores, then adhesive heatshrink over the whole thing ensuring that it's properly bonded to the outer insulation all the way round. This gives a robust and waterproof joint. However, this technique doesn't work for the three-way joint needed here, because one end of the heatshrink has two cables coming out of it and you can't get a continuous glue seal all the way round.

I can think of various ways of solving this, from self-amalgamating tape to a blob of silicone to a waterproof junction box and cable glands, and others besides. But I'm curious to see if the forum can suggest a neat, elegant, and relatively cheap technique for a three way joint which I haven't come across.

Cheers,

Pete
 
Several neat and tidy coats of proper liquid insulator ? That black stuff costs but is very good.
I use the spray and brush on versions.
When I had Ariam's mast down last winter, I ran a cable for some deck lights. However, I ran out of time before the scheduled re-rigging to find some lights I liked, so the upper end of the cable is neatly coiled and taped to the underneath of the radar bracket.

I've now found and ordered some lights - retrofit boy-racer daytime running lights designed to simply be stuck to a car bumper with double-sided foam tape. Tacky as hell on the road, but the stick-on nature means they are very thin and hence unobtrusive on the undersides of the spreaders. I'll probably back up the included sticky with some sikaflex and / or epoxy.

Once they arrive I'll need to wire them up. My usual standard for permanent wiring like this is solder, plain heatshrink on the individual cores, then adhesive heatshrink over the whole thing ensuring that it's properly bonded to the outer insulation all the way round. This gives a robust and waterproof joint. However, this technique doesn't work for the three-way joint needed here, because one end of the heatshrink has two cables coming out of it and you can't get a continuous glue seal all the way round.

I can think of various ways of solving this, from self-amalgamating tape to a blob of silicone to a waterproof junction box and cable glands, and others besides. But I'm curious to see if the forum can suggest a neat, elegant, and relatively cheap technique for a three way joint which I haven't come across.

Cheers,

Pete
 
You need something like .........

769307-40.jpg
 
Whatever you use to seal the joint (stormsure scealant is also good) you could put it all in an IP44 Junction Box.

I could, but it starts to get a bit bulky and serious for something that wants to just poke out of a hole and run along the spreaders.

As it happens, the lights turned up today (Saturday), much earlier than expected. So I'm going to go and fit them tomorrow (Sunday) as the mast will be going back up some time next week while I'm at work. I was expecting to have to do the job on the end of a rope, but will take the opportunity not to.

Without the chance to obtain any special jollops as suggested here, I think I'm going to pot the whole lot in sikaflex, inside a short length of wide-bore heatshrink with all three cables coming out the same end, with the top folded over and sealed.

Impressed with the lights, by the way - very compact, but painfully bright and flooding a wide area with even light.

Pete
 
image.jpgWhat you could do is with the glue heat shrink, shrink it down, then with pointed plyers or a piece of iron, lollipop stick, pinch between the wires and hold until cooled and you have a 2 way or 3 way boot for little money, asked http://www.shrinkfit.co.uk/ and they helped solve the problem.

Thanks
4nna

Trying to add picture of standard adhesive lined you can make an inline boot from saving on costs.
 
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