Twin and earth into junction box

[Deeyewire]

Hi,

A simple question this: I need to feed 4mmsq twin and earth cacle into an outside junction box. The box has 20mm knockouts, I am coming in from the top. Which is the best way to do this, making sure I maintain the IP rating? The t+e is in plastic conduit. 

 

[binky]

enter from side or bottom is possible, use a TRS gland, don't forget small drain hole in bottom of box.

 

[Lurch]

The t+e is in plastic conduit.

So the twin & earth part is irrelevant, the conduit is entering the box.

I'm a bit confused as to what you are wanting to do here.

 

[Deeyewire]

I was unsure of the connection between the conduit and the box, but blink's solution seems workable, ie a brass trs gland. Does this connect to the conduit and then to the box? My main concern was to maintain ip, I do have the option of side entry to minimise moisture ingress. 

 

[Sidewinder]

Well if you simply connect the conduit to the enclosure with the correct fittings in the correct manner, then the ip rating is sorted.

 I am also a little confused as to what the issue in coupling conduit to an enclosure is?

 

[Lurch]

I was unsure of the connection between the conduit and the box,

https://www.tlc-direct.co.uk/Products/MT20FMAB.html

https://www.tlc-direct.co.uk/Products/MT20MAB.html

One or the other. depending on the type of box specifically. Usually the female one for a plain sided box and the male one for boxes with pre-threaded entries.

Also available in white.

 

[Deeyewire]

Thanks Lurch, and everyone, and sorry for any confusion. I knew the plastic fittings were ok internally, they just seemed a bit flimsy for outside use, and vulnerable to water. However if they are acceptable so be it. 

 

[Evans Electric]

Just to add, the coupler is a push fit and will, I'm sure , be water tight , however I got into the habit of glueing them for outside use.  

You won't want to buy the special glue but could run a bead of mastic round the joints . 

 

[steptoe]

I glue the top, but never the bottom,

Especially with black, gives a little bit of expansion room. 

 

[Deeyewire]

Cheers all, problem solved, especially if I use a sealant. 

 

[sprocketflup]

Plumbers waste pipe solvent works, about a fiver from your plumbers merchant.

Don't sniff too much of it tho

 

[Lurch]

Plumbers waste pipe solvent works,

They used to be different for waste pipe and conduit but I have just looked at the CoSHH sheets for a few conduit and waste pipe adhesives and they are all exactly the same nowadays.