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Discuss best way to joinn cables in cu change ? in the Industrial Electrician Talk area at ElectriciansForums.net

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petewan

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I'm changing a cu, and some of the cables may be a bit short to connect to the new cu.
can any one advise me on the best way to connect and extend these cables.
I would grateful for any help.
Yours Pete.
 
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Paul_Rawlinson

  • Thread Starter Thread Starter
  • #2
I normally crimp them, if possible inside the new CU if not then in a 2gang Patress box with blanking plate on for neatness.have done it inside big trunking in the past aswell, looks fairly neat when done, well as neat as trunking can look in a house
 
P

petewan

  • Thread Starter Thread Starter
  • #3
Thanks paul, i was thinking crimps
 
U

uksel

  • Thread Starter Thread Starter
  • #4
can you fit a junction box in above the new CU (where the existing cables surface)

then run singles through some pvc conduit into the new CU
 
W

WarrenG

  • Thread Starter Thread Starter
  • #5
I know it may seem a bit too obvious, but can you move the new CU to a better position i.e. higher or lower, further left or right?

If not as said crimps or JB.
 
P

petewan

  • Thread Starter Thread Starter
  • #6
No Warren, cables coming in from top and bottom, all very short
 

jeremy

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Mentor
Arms
i would normally advocate crimps but have

Lets start again. I have started using spring operated push fit connectors. inexpensive and very quick. Work out about the same as crimps and a lot more definite when using them. Interested to hear others experiences
 
Last edited:

jeremy

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Mentor
Arms
I wouldn't know what to do with a link if it came up and smacked me in the face!! Not very computer literate! But I think the brand is Hellerman Tryon. If not they were reviewed in prof elec last month. If still no joy they're in the van, I'll get them out for tomorrow. Crimps can also come in different qualities. I've had crimps so soft that you could do them with your teeth, not much good , but too hard is 5hit also. I've never had a prob with SWA branded crimps but that isn't an advert or an endorsement!!
 
... but your not supposed to crimp solid core are you? because after time the solid core will have expanded and reduced in size, eventually causing the crimp to become loose? so whats the alternative ?
 

jeremy

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Mentor
Arms
I've never been told that face to face and in fact prof elec last month or the month before were reviewing crimps for solid cores. I see the theory but if I can't pull them apart when I join them then it's a solid connection. This subject has come up before and I would love some one from the crimping industry to answer it. Surely this can not be beyond the means for someone who runs a site like this one perhaps!?
 
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uksel

  • Thread Starter Thread Starter
  • #12
this may sound like the most extreme and time-consuming and difficult

but joint soldering and applying heatshrink

going on a comment above i think the idea of crimping single cores is a bit dubious, good call there.
 
F

fog

  • Thread Starter Thread Starter
  • #13
hi interested in this thread, i have used and still do use IDEAL brand spring loaded connectors once cable is in cannot be removed they are insulated but can only be used for 2.5mm or smaller cable csa, good to use in the back of switch for lighting circuits , but make sure you have done testing first as cant get a reading to well insulated!
 
response to uksel, won't the solder eventually melt a tad with electricity causing heat? I heard in one situation that sum1 soildered sum machinary, aparatenly a big mistake because the soilder melted and caused it to burn out or sumit?....
 
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fanta

  • Thread Starter Thread Starter
  • #15
I was brought up to believe that crimping of solid cores is "bad practice".Surely an adaptable box with fixed base connectors of the correcting rating for the circuits involved should do the job fine. Obviously the correctly labelling should be fitted to the box cover which should be mounted in an accessable position.
 
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