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Topic Title: Rewiring lighting in old conduit
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Created On: 24 February 2014 07:19 PM
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 24 February 2014 07:19 PM
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ryespark

Posts: 203
Joined: 05 March 2008

Hi guys

Am attempting to rewire the lighting circuit of a 1930s flat run in metal conduit tomorrow for the first time.

Any tips for pulling the new singles in? Do you simply pull it though using the old wiring?

Many thanks
Ryan

-------------------------
Ryan Andrews

http://www.electrician-hampton.co.uk/
 24 February 2014 07:48 PM
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Fm

Posts: 709
Joined: 24 August 2011

Which floor is the flat?
Top floor hopefully! Cut the conduits in the loft and rubber slip on grommet and wire in t and e?
Get some lube, plenty tape and a mate for pulling as you feed in if its in singles
 24 February 2014 07:50 PM
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ryespark

Posts: 203
Joined: 05 March 2008

No ground floor I am afraid, always talked myself out of quoting for jobs like this before as have never done it, but it's time to give it ago.

-------------------------
Ryan Andrews

http://www.electrician-hampton.co.uk/
 24 February 2014 07:53 PM
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aligarjon

Posts: 2867
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Watch the earth continuity on it if its that old. Good luck.

Gary

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Specialised Subject. The Bleedin Obvious. John Cleese
 24 February 2014 07:55 PM
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ryespark

Posts: 203
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Hi Gary,

Was going to try and pull a cpc in if it fits

-------------------------
Ryan Andrews

http://www.electrician-hampton.co.uk/
 24 February 2014 07:56 PM
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peteTLM

Posts: 3186
Joined: 31 March 2005

run a cpc with the circuits as the old slip conduit (or any conduit that old) isnt going to be up to much.

-------------------------
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 24 February 2014 08:08 PM
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aligarjon

Posts: 2867
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I was meaning that it will still need to be earthed so may need to be connected at several accessories. I did one of these a few years back , it was a challenge

Gary

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Specialised Subject. The Bleedin Obvious. John Cleese
 24 February 2014 10:22 PM
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Fm

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A tenby clamp on the conduit at the db if it doesnt end in a box.
 24 February 2014 11:10 PM
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largelunchbox

Posts: 373
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Originally posted by: ryespark

Hi guys



Am attempting to rewire the lighting circuit of a 1930s flat run in metal conduit tomorrow for the first time.



Any tips for pulling the new singles in? Do you simply pull it though using the old wiring?



Many thanks

Ryan


hi

i find these type of rewires can be the easiest,especially if no new locations are required, hopefully the conduit will not have collapsed any place and you should have it done in 2 days.
 24 February 2014 11:11 PM
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largelunchbox

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correction,half a day if it only the lighting
 25 February 2014 06:39 AM
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normcall

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In my experience, 1930's purpose built flats are in screwed tube - if you are really unlucky it will be 5/8 tube.
They also liked to use BESA boxes to save on copper cable and neatly plastered over or a wall is built covering up more than half the buried box on the ceiling (just above a switch drop).
The conduits often just terminated behind a fusebox - which could easily be buried in the wall and double pole fusing.

OK, I'm just unlucky!

-------------------------
Norman
 27 February 2014 02:33 PM
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tomgunn

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I feel very confident that it will be proper conduit. the thing is that the wiring will almost certainly be old VIR cable and its sticky after that amount of time.

What to do, and remember it 2 plate wiring and not 3 plate for the lighting, is try and pull out each cable leaving one cable left behind... if you cannot shift the cables singularly then make sure you get a good joint and connect some 4mm singles to one end and its best to have someone the other end and start pulling one end and the other chap is 'feeding' from his side.

Pull the wires out and then do a real good jointing, (spacing each cable down the joint from the first one etc), put some lard / tallow etc on the new cables and one feeds while the other pulls in unison - take care - go slowly and jobs a goodun! The 6mm can be a bit of a bugger but you'll be fine! Plenty of tallow / lard!!

Good luck!

Tom

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Tom .... ( The TERMINATOR ).

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I can resist anything..... except temptation! ( Karl Gunn ).
 27 February 2014 03:33 PM
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redtoblackblewtopieces

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Yellow 77 might be a better bet Tom.
Kevin

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 27 February 2014 03:48 PM
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tomgunn

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Hi, not heard of that one.

Tom

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Tom .... ( The TERMINATOR ).

handyTRADESMAN ... haha

Castle Builders

Why did Nick Clegg cross the road? Because he said he wouldn't!

I can resist anything..... except temptation! ( Karl Gunn ).
 27 February 2014 05:18 PM
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AJJewsbury

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Someone will be suggesting washing up liquid next
- Andy.
 27 February 2014 06:51 PM
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OMS

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Originally posted by: AJJewsbury

Someone will be suggesting washing up liquid next [IMG][/IMG]

- Andy.


Only if it's mild, green Fairy Liquid, Andy -

Regards

OMS

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 27 February 2014 06:55 PM
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OMS

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Originally posted by: tomgunn

Hi, not heard of that one.

Tom


Try here

Good stuff, but you can't use it for a Ulster fry

Regards

OMS

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 27 February 2014 09:45 PM
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tomgunn

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Originally posted by: OMS

Originally posted by: tomgunn



Hi, not heard of that one.



Tom





Try here



Good stuff, but you can't use it for a Ulster fry [IMG][/IMG]



Regards



OMS


Hahaha... wot next? And... wots wrong with washing up liquid may I ask?? Haha!

Nah... give me some good olde tallow!

Tom...

-------------------------
Tom .... ( The TERMINATOR ).

handyTRADESMAN ... haha

Castle Builders

Why did Nick Clegg cross the road? Because he said he wouldn't!

I can resist anything..... except temptation! ( Karl Gunn ).
 28 February 2014 04:51 AM
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MrP

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Tommy
Wot's wrong with washing up liquid

In a previous life we did a shed for a packaging company utilising 20/25mm gal conduit and singles. In the shed was boxes and boxes of washing up liquid so the guys used a little of what was on hand to ease the installation of the singles all was well good job finished and paid.

Six months later I got a call from the site manager big problem with the distribution board that we had installed. Over time the washing up liquid had worked its way back down the conduit into the board, shorting out the breakers not enough to pop the breaker but enough to cause heat, with the individual breakers melted into one mass of distorted plastic mess. We were very very fortunate.

The reason why the packaging company had a new shed built was that the previous one had burnt down.

MrP day ten eighteen days to go
 28 February 2014 09:57 AM
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tomgunn

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Originally posted by: MrP

Tommy

Wot's wrong with washing up liquid



In a previous life we did a shed for a packaging company utilising 20/25mm gal conduit and singles. In the shed was boxes and boxes of washing up liquid so the guys used a little of what was on hand to ease the installation of the singles all was well good job finished and paid.



Six months later I got a call from the site manager big problem with the distribution board that we had installed. Over time the washing up liquid had worked its way back down the conduit into the board, shorting out the breakers not enough to pop the breaker but enough to cause heat, with the individual breakers melted into one mass of distorted plastic mess. We were very very fortunate.



The reason why the packaging company had a new shed built was that the previous one had burnt down.



MrP day ten eighteen days to go


Hahaha - sorry! Fair point! I am trying to remember if I did use washing up liquid? I cant say I did or not - but either way, haha, I will def not in the future!

In 1981, (Diana got married?), I was wiring huge houses on price work, three of them and two others to finish off. We laid our T&E's in the boxed flooring thing that was provided and then all finished. Sometime later I had a call that our cables were decomposing, (a bit like Johann Sebastian Bach I guess), as when the builders finished off the houses they filled these boxed trenches set in the floor with shredded polystyrene granules and what was happening was the polystyrene was actually eating the PVC sheath away! Also be careful when wiring in the rafters that have polystyrene for insulation purposes!

Keep clean out there! Haha!

Tom

-------------------------
Tom .... ( The TERMINATOR ).

handyTRADESMAN ... haha

Castle Builders

Why did Nick Clegg cross the road? Because he said he wouldn't!

I can resist anything..... except temptation! ( Karl Gunn ).
IET » Wiring and the regulations » Rewiring lighting in old conduit

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