How do you seal an open ended conduit?

[plockhart]

I have ran a 20mm conduit from the inside of my garden room to the outside, with the intention of running the 1.5mm T&E to an outdoor light somewhere nearby. I would like to seal the conduit but I'm not sure how to do that as the conduit won't be going into anything for this fixing. The conduit and cable will be between 38mm battens, and will be behind cladding. I have attached a picture of the conduit which I still need to trim back to behind the batten depth.

 

I will most likely have to run the cable to it's destination before putting on the external cladding (since the cable will be inaccessible as I build the cladding bottom up), so that means the seal of the conduit would need to be resistant to movement as I work with the cable at its destination. What would you recommend I do?

 

Thanks!

 

Edited February 25 by plockhart

[plockhart]

OR maybe I'm thinking about it wrong. Do I seal the inside of the conduit with silicone around the cable as it enters the backbox, and keep the outside end open so any condensation can drain out? if I plug the outside then maybe that results in a build up of water that can't drain out?

[Russell griffiths]

Cut the conduit proud of the membrane by 5mm, Push the cable through with loads of spare, silicon the cable into the conduit and seal the conduit to the membrane, it’s that simple. 
 

if you want to be more thorough you can buy a square of membrane that has a small stretchy area in the middle designed to be placed tightly over pipes and taped onto the membrane. 

[plockhart]

2 hours ago, Russell griffiths said:

[..] silicon the cable into the conduit [..]

 

Do you silicone the outside end, the interior end, or go wild and fill the entire conduit 😅

 

Also do you need to do anything to prevent condensation in the conduit not being able to escape outside?

 

Thanks in advance.

[Russell griffiths]

Just the ends. ,don’t be overthinking this. 

[Nickfromwales]

Does the conduit fall downhill from inside to out? If so, you just seal internally. If the conduit is flat, drill again and set it at a fall.

[saveasteading]

9 hours ago, Nickfromwales said:

just seal internally

And allow insects a nice winter hibernation spot. Up to you.

[Pocster]

Expanding foam 

[plockhart]

Thanks all for the additional replies. Some commentary from me:

1. yes the conduit is on a slight fall
2. the top and bottoms of the battens will have insect mesh but that won't stop the small stuff getting in I suppose

[crispy_wafer]

28 minutes ago, Pocster said:

Expanding foam 

yep, then ct1 over each end, if insects want to get in they are gonna need strong digging tools

[Nickfromwales]

3 hours ago, saveasteading said:

And allow insects a nice winter hibernation spot. Up to you.

Check under your bed every night before you go to sleep.
 

Richard Attenborough will be waiting for you, and will pounce when you least expect it. 🥷 

[plockhart]

Are some folks advocating doing the full length in expanding foam? Presumably the amps is low enough that I don't worry about cable temperature (1.5mm2)? 

[crispy_wafer]

Nah, a squirt in the end about 30mm or so each end and a very quick trigger, how far into the conduit the foam spreads I don't know.  once two cables are in, the nozzle will only go so far.

[Pocster]

24 minutes ago, crispy_wafer said:

Nah, a squirt in the end about 30mm or so each end and a very quick trigger, how far into the conduit the foam spreads I don't know.  once two cables are in, the nozzle will only go so far.

Done this on a zillion cables/ pipes in conduit. Squirt it in both ends as the man said last night.

Edited February 26 by Pocster

[saveasteading]

3 hours ago, Nickfromwales said:

Richard Attenborough will be waiting for you

He would spout Shakespeare.

But David would praise you for providing an insect haven.

[Russell griffiths]

(expletive deleted) me how can sealing up a poxy bit of conduit turn into some shit show about if it should be sealed on the outside side or on the inside. 
FFS  just stick some (expletive deleted)ing silicone in it. 

[Pocster]

1 hour ago, Russell griffiths said:

(expletive deleted) me how can sealing up a poxy bit of conduit turn into some shit show about if it should be sealed on the outside side or on the inside. 
FFS  just stick some (expletive deleted)ing silicone in it. 

Best to overthink everything and then do a 20 second job 🤣

[saveasteading]

2 hours ago, Russell griffiths said:

how can sealing up a poxy bit of conduit turn into some shit show

Because it's an easy answer and takes ten seconds. Yours included.

One of Parkinson's laws applies.

There you are that's yet another one.

[Nickfromwales]

2 hours ago, Russell griffiths said:

(expletive deleted) me how can sealing up a poxy bit of conduit turn into some shit show about if it should be sealed on the outside side or on the inside. 
FFS  just stick some (expletive deleted)ing silicone in it. 

How do you feel about the 🐞 🐜 🦟 ?

[plockhart]

17 hours ago, Russell griffiths said:

(expletive deleted) me how can sealing up a poxy bit of conduit turn into some shit show about if it should be sealed on the outside side or on the inside. 
FFS  just stick some (expletive deleted)ing silicone in it. 

Thanks all! What way up do I insert the silicone tube? Also does it matter if I hold the gun left handed or right handed? Is there a preferred holy day to do this?

[JohnMo]

It may only take you 10 years to build it at this rate. 2 days of discussion on a 30 second job.

[saveasteading]

7 hours ago, plockhart said:

Also does it matter if 

We must take every question seriously, assuming the enquirer is a complete novice.

 

7 hours ago, plockhart said:

preferred holy day 

Well,  a tube has one hole or two holes, depending how you look at it.

[Big Jimbo]

Smarties only have One hole. It used to have a nice plastic lid, with a letter of the alphabet on the rear, so you could collect them to spell your name. Those were the days.

[Pocster]

52 minutes ago, Big Jimbo said:

Smarties only have One hole. It used to have a nice plastic lid, with a letter of the alphabet on the rear, so you could collect them to spell your name. Those were the days.

I used to push the cardboard bottom in to get the flavours out . Not a euphemism