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Richard

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Hi, Great site you have here guys. I`v being watching for a few months, and now have a question.

In colege, they have told us that when wiring in steel conduit, all wiring is done in single core cables, as opposted to Twin+earth.

Is there a reason for this?

Would seem logical to me to use Twin+earth, to keep things tidy...

Thanks in advance.

Richard
 
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Grae79

  • Thread Starter Thread Starter
  • #3
yes'm...gonna need some pretty large conduit or numerous smaller runs if you're gonna be using T & E and would be hellish to draw cables in...also would have to sleeve all your cpc's too...pain in the arse when there's no need....singles are the future, i've tasted them. ;)
 
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Cirrus

  • Thread Starter Thread Starter
  • #4
I think they use singles in domestic work on the continent don't they? I know they use conduit - brilliant for re-wiring.
 
hiya, glad you've started posting ;) , i think its a right pain getting say' 2 x twin + earth down 20mm conduit, like Grae said its the furture. rather not get bogged down feeding cable down a tube all day, when ya can be doing something more productive,
 
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markthespark

  • Thread Starter Thread Starter
  • #6
with using singles cablles there is no need for joints.
 
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rumrunner

  • Thread Starter Thread Starter
  • #7
If its steel conduit ,you can always try putting the neutrals in a seperate pipe,if you dont have room .anything for a bit of fun,
all the very best in the world
rumrunner
 
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TonyM58

  • Thread Starter Thread Starter
  • #8
Gents, if you were to run twin and earth, how exactly would you work ouit your conduit factors?.......:rolleyes:

cos' you do work out your conduit factors dont you.....? chaps....?:rolleyes:

the tables only have singles in them.

if you used twin and earth you would have to greatly change your factors because of the additional insulation in there......

and neutrals in a seperate pipe, hope we're not going down the route of single conductors in ferrous enclosures here........:eek:
 
A

alex

  • Thread Starter Thread Starter
  • #9
:confused::confused::confused::confused::confused::confused::confused::confused::confused::confused:

when working in hull all the rewires were t&e in conduit.
 
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rumrunner

  • Thread Starter Thread Starter
  • #10
I had a similar problem years ago,doing council rewires,all the switch drops and some sockets were 3/4 inch conduit,but it wasnt a conduit system as such ,so we had to use tae which was a very tight fit and not a very good job ,,the reason they were conduits was the walls were solid concreate and the pipes were obviously installed before the concreate was pored,some guys stripped the tae ,but this was considered bad practice by most.the whole job was a nitemare,and took ages
all the very best in the world
rumrunner
and Tony,i was only joking about seperate pipes for the neutrals , its not a good Idea!
 
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TonyM58

  • Thread Starter Thread Starter
  • #11
Like i said guys, if you put twin and earth in conduit, then you cant possibly have worked out your conduit factors

are you chaps suggesting you DONT spend 2 hours in the regs before every job???:rolleyes:

that takes all the fun out of it:D

regards

Tony (promising to get out more):eek:
 
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Grae79

  • Thread Starter Thread Starter
  • #12
personally i don't spend 2 hrs before every job immersed in the regs......has to be at least 4.....sometimes i just read the lot before breakfast!... :)
 

Wilson12

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Trainee
Embarrasing question
Singles-does that just mean separate wires
One neutral wire one cpc wire one line enclosed in conduit
Rather than the all in one cable t&e
 
Embarrasing question
Singles-does that just mean separate wires
One neutral wire one cpc wire one line enclosed in conduit
Rather than the all in one cable t&e

Yes, single insulated cables.

You can get say for instance meter tails, these are insulated and sheathed. Some people would call them double insulated however.
 
R

R G

  • Thread Starter Thread Starter
  • #18
T&E is generally solid conductors , whereas singles are stranded and more pliable without the fear of conductor breakage when pulling around bends etc ,
 

Pete999

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Arms
Esteemed
Hi, Great site you have here guys. I`v being watching for a few months, and now have a question.

In colege, they have told us that when wiring in steel conduit, all wiring is done in single core cables, as opposted to Twin+earth.

Is there a reason for this?

Would seem logical to me to use Twin+earth, to keep things tidy...

Thanks in advance.

Richard
Yes Rich a sealed conduit system be it metal or PVC is an ideal way of wiring with singles, imagine wiring a lighting circuit in twin and earth in conduit, near impossible.
 

Toonlad

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Arms
Esteemed
Embarrasing question
Singles-does that just mean separate wires
One neutral wire one cpc wire one line enclosed in conduit
Rather than the all in one cable t&e
saved.jpg

2008 need to be a bit careful, nearly 8 years ago last answerd
 
Last edited:

davesparks

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Mentor
Arms
Esteemed
Embarrasing question
Singles-does that just mean separate wires
One neutral wire one cpc wire one line enclosed in conduit
Rather than the all in one cable t&e
Yes, except in steel conduit you wouldn't necessarily need the cpc as a cable since the conduit normally satisfies the requirement
 

Richard Burns

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Mentor
Arms
Esteemed
Single core single insulated cables (singles) can only be used where they are protected from damage and the insulation is not exposed to touch.

This in practice means that they must be fully enclosed and the usual methods of containment are conduit or trunking.
If this containment is maintained up to the connection to the piece of equipment then this is acceptable.

For a motor the cable may be subject to vibration and a more flexible cable may be appropriate in some circumstance, however if the vibration is limited then singles in conduit can be used for a motor connection.
 
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