t@e in conduit?

[Sparky28]

Hi all, query, I need to run a cable (s) and I was thinking of running a piece of 1.5mm in a piece of 20mm conduit approx 2 meters before going into a stud wall.

Just wondered what ideas are out there ????

Cheers

 

[somersetsparks]

do it, i assume you mean placcy conuit, not the proper stuff? If it metl make sure you earth it!

 

[vernam616]

How the hell are we supposed to answer that?

You may as well have asked " does anyone know the winning lottery numbers for next week?"

 

[Strima]

100mm should be big enough to get the T&E in to...

 

[Sparky28]

Yeah PVC conduit just thought it might of been frowned upon. Thanks for response

 

[Sparky28]

Vernam, what's the problem??

 

[SJD]

I've put T&E in plastic conduit, straight runs are fine, also the odd bend if you bend the conduit using an internal spring.
But trying to use the bends you can buy doesn't work, they are too small a bending radius and cause the T&E to coil up and/or jam, as you'll see if you try it.

 

[Sparky28]

Thanks sjd top response will stay away from bends just an option when it's impossible to get into the stud direct. Cheers mate

 

[snowhead]

You can use bends you just need to put the conduit over the cable, not try and push the cable thro after the conduit is all in place.

 

[Guitarist]

Nothing wrong with T&E in plastic conduit, rather than conduit cable, if that's what you are asking. It's just more expensive to do it that way, but if you already have it, and no conduit cable, then go for it.

 

[telectrix]

he's got to use T/E as it's partly in a stud wall and whatever without conduit, so he cant use single insulated singles. nowt wrong with T/E in tube, but as snowhead said, thread it piece by piece and you can use bends then.

 

[LlandrilloSpark]

Did it last week, two lighting circuits in a small shop, flat above the shop so can't bury in cable so ran 1.5mm in 20mm PVC conduit, either that or self adhesive trunking.....no thanks

 

[mogga]

its not problem but might be worth the wee bit extra ££s n use 25mm make pulling a bit easier

 

[Octopus]

Vernam, what's the problem??

Don't take this the wrong way but he's got a point. Your original post was very vague and wide open to a multitude of interpretations.

Yes use 20mm plastic but don't use the "tight" bends unless you have too.

 

[drew35]

You may as well have asked " does anyone know the winning lottery numbers for next week?"

You don't do you??? Just asking...? Just tell me five of them if you want to keep the jackpot to yourself.

 

[yamar1]

I've put T&E in plastic conduit, straight runs are fine, also the odd bend if you bend the conduit using an internal spring.
But trying to use the bends you can buy doesn't work, they are too small a bending radius and cause the T&E to coil up and/or jam, as you'll see if you try it.

one word, draw wire. yellow77 if needed.

 

[telectrix]

doing it piece at a time, i've got 6mm T/E in 20mm plastic, with elbows. 1.5 should fly in.

 

[malcolmsanford]

do it, i assume you mean placcy conuit, not the proper stuff? If it metl make sure you earth it!

Why would you earth the metal conduit SS, if there is T+E inside it?

 

[schap76]

Take you forever and a day to thread it may be better of using thru boxes and bending the conduit.

 

[simpson93]

nice bit of trunking might look better?

 

[somersetsparks]

Why would you earth the metal conduit SS, if there is T+E inside it?

having said it I can see your point with T+E malc, we have done a few jobs for a county council who insist on all drops in or on walls even for t+E to be in galv conduit, tray/basket is fine above suspended ceilings. they also insisted on all conduit carrying LV cables to be earthed. I suppose I've picked up the practise from there, be it ne4cessary or not!

 

[malcolmsanford]

Thanks SS and we are right that piece of metal would never be classed as an Exposed conductive part, if it's carrying T + E. as a piece of metal/containment can only be an exposed conductive part when Basic insulation breaks down, which T+E isn't

I do hate these cretins who insist on making you "Earth" something because it is belt and braces. It isn't in fact by earthing a piece of metal that you don't need to, you make that piece of metal part of the installation, in this case part of the CPC system, and on a fault situation you can make that metal live.

Ok it would be for fractions of a second and highly unlikely to cause a problem, but I could never fathom how making a piece of metal become live in some circumstances, to it never being live under any circumstances is safer

 

[somersetsparks]

To be fair to the county council, their spec is pretty good by todays lacklustre standards, its just one of those little things that the clerk of the works liked to be picky on! Most of the time these drops terminated at a flush box though so would be earthed anyway.
I have seen the 'extreme' end of this though where Galv was used for fire alarm drops in FP200 - the fire alarm contractor went to the lengths of 'cross bonding' the conduits to LV ones above suspended ceilings!