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Topic Title: Rant !
Topic Summary: G/Y Sleeving
Created On: 11 December 2012 01:13 PM
Status: Post and Reply
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 11 December 2012 01:13 PM
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SherlockOhms

Posts: 322
Joined: 05 April 2011

There are a couple of people I'd like a quiet word with when I arrive in heaven.

The first is the guy that rubber stamped button flys on jeans.
The next is anyone who's put both CPC's of a ring in the same earth sleeve.

I will find you !

S.
 11 December 2012 01:43 PM
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vesuvius

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Ha Ha, its a real bad habbit that one, same for ceiling roses where potentially 4 cable earths all in one big bit of sleeving shoved into the terminal.
 11 December 2012 02:01 PM
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OMS

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The next is anyone who's put both CPC's of a ring in the same earth sleeve.


Is that before or after twisting them together ?



OMS

-------------------------
Failure is always an option
 11 December 2012 03:30 PM
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spinlondon

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Must be twisted.
 11 December 2012 03:34 PM
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londonlec

Posts: 61
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I caught a mate of mine out the corner of my eye with his pliers twisting earths at a socket outlet before!

He has 10 years more experience than me but said no one had ever taught him not to twist earths.
 11 December 2012 04:05 PM
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daveparry1

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Although I don't do it, I don't mind the cpc's being in the same sleeving as long as they're not twisted!

Dave.
 11 December 2012 06:01 PM
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mossep

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Not that I do it, but what is the problem with it then? On the plus side, where the earths are twisted at the point where they leave the cable sheathing they have no chance of separating. I guess the negative side is that it's a pain when it comes to testing as its a chore to un twist them. The only downside I can see is that it's more work for someone when fault finding.

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www.mossep.com
 11 December 2012 06:13 PM
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daveparry1

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its a chore to un twist them.
-----------------
That's the whole point Mossep, plus the fact that they can break off if they've been twisted tightly together. So much less bother if you can remove them from the terminal, do the test and then put them back,

Dave.
 11 December 2012 06:14 PM
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prophet

Posts: 210
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1) You've never been caught in a zip before then!
2) Don't mind in sockets as long as not twisted and seperated at board

When are we going to get sleeved cpcs in t+e anyway
 11 December 2012 07:44 PM
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djrichiet

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Originally posted by: prophet


When are we going to get sleeved cpcs in t+e anyway



Hopefully never, not the way i strip the outer sheath anyway

-------------------------
From SMD's to 132kV... ive had a go!

Richard Talmage, LCGI EngTech TMIET
 11 December 2012 08:04 PM
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OMS

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Originally posted by: djrichiet

Originally posted by: prophet

When are we going to get sleeved cpcs in t+e anyway



Hopefully never, not the way i strip the outer sheath anyway


You must be one of those awful people who rip the sheath by tugging on the CPC then - did no one show you how to strip it with a knife in the correct fashion

regards

OMS

-------------------------
Failure is always an option
 11 December 2012 08:15 PM
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mossep

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Originally posted by: daveparry1

its a chore to un twist them.

-----------------

That's the whole point Mossep, plus the fact that they can break off if they've been twisted tightly together. So much less bother if you can remove them from the terminal, do the test and then put them back,



Dave.


Being a chore to un twist them doesnt make it a bad habbit though, it just make sit diffucult lazy sparks like us!. If anything, its a more robust and sound way of terminating them.

Ive never had or seen one snap because of twisting either, I can only imagine it snapping if the cable has been damaged somehow whist stripping it from the T+E, in which case, its better that it snaps whilst wiring it up, than gets terminated and breaks at a later date.

Just for the record I sleeve them individually with a nice bit of 2mm sleeving and fold them over at the end.

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www.mossep.com
 11 December 2012 08:18 PM
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daveparry1

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What is so bad about doing that then OMS? I know it is frowned upon by some people but never understood why. The only reason that I can think of is that it could stretch the cpc making it thinner but i can't really see that happening from the soft pvc sheath?

Dave.
 11 December 2012 08:23 PM
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mossep

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I think that is the reason Dave although in practice I cant see it happening.

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www.mossep.com
 11 December 2012 08:35 PM
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leckie

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Dave, don't listen to oms. He doesn't know what he's talking about. Ukpn told me!

He's actually about 70 and still makes of all swa with lead and a ladle
 11 December 2012 08:43 PM
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OMS

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I feel like it at the moment - but in reality, I'm still too young for a mid life crisis.

Don't do it - it's a crap practice -

OMS

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Failure is always an option
 11 December 2012 08:55 PM
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leckie

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Well, just to be controversial, this is I think the most robust reliable way of terminating the cpc's to a socket with twin and earth cable..........

The most common fault I find is an open circuit or higher than expected reading on the cpc's of ring mains. Either a core snapped off, or both cores in one bit of sleeving and one doesn't get terminated and disappears up the sleeving. The latter giving a higher reading than expected.




Twist cores together for about 3 inches, or 77mm. Do not twist the ends, terminate them as separate cores. Stops all slipping up sleeving and gives perfect readings
 11 December 2012 08:59 PM
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leckie

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I don't actually do that, I keep separate, but I think it would be the most reliable connection. But keep separate at the board always
 11 December 2012 09:45 PM
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jumpinjax

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Trouble with twisting together is that you can get a good end to end on a ring final and the cpc could be out of the terminal.
 11 December 2012 10:00 PM
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leckie

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Ah ha! I knew there was a reason I didn't do it that way! Good point
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