conduitwire
I have a 2 meters long plastic tube with 8 mm inner diameter, and I need to pull 5 wires with a 6 mm diameter silicone tube through it. But all the different ways I tried were unsuccessful and It made me really frustrated.
What is the best way you propose for doing this?
I have limits in choosing a larger diameter plastic tube.
As you can see in the picture, although being slightly tight, there is enough space for pulling them through the tube.
Thanks.
You ask for a box, as long as 120V does not go thru, then you can use a low voltage cut-in ring.
These rings come in 1,2,3 and 4 gang or even round. You can use a 1 gang weatherproof cover with either 1 1/2 hub or 3 hubs. Or you can buy a blank plate and drill your own 7/8.
Weatherproof plate with 3 1/2 hubs
To make where your cable goes thru the cover you can use a strain relief connector. You pick your connectors by the size of gland (grommet) you need to use and then there is a compression nut that tightens and the gland compresses to your cable.
You can probably get 2 holes drilled if you use a 1 gang blank plate or 4 holes if you use the 2 gang ring and plate. You can always do one size and change the ring to a larger size if you want, but you can't go backwards.
You can buy all this at a DIY box store or at your local electrical distributor.
Now you've learned the hard way, the same way the rest of us learned, why they say "measure twice."
A spade bit may work for this trick, but an auger bit may be easier to control. First, use the bit to cut a hole in center of some scrap wood. A piece of plywood that's 4"x6" would work well, and a 2x4 that's 6-8" long would also work. You need a few inches on each side of the hole, and enough so that it doesn't shatter apart when the drill bit is vibrating inside, but thickness isn't that important. Since you're working in a crawl space, start a few screws on each side of the hole that you drilled.
In the crawl space, line up the hole in the scrap wood with your existing hole and screw it into place so it doesn't move. This wood is now your guide to keep the drill bit from running all over the place. Put your drill bit inside this guide, make sure you're aligned, and drill your larger hole.
Best Answer
If you have access to a shop vac or other vac, try sucking a strong string thru first, then tape the end to your group of wires & tube and pull it thru. It's helpful to loosely tie some knots on the start of the string to give the vacuum something to "grab on to".