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 Post subject: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 6:01 pm 
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Mr. Grumpy

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Ok I need to extend a 2.5mm T&E tomorrow and just had a question about crimping. So it looks like I ....

1) slide the heatshrink down the cable first
2) stagger the joints so the butt connectors are not bunched up.
3) Use 3 blue Butt connectors, no copper poking out
4) Ratchet Crimpers
5) apply the heatshrink
6) have a coffee and kitkat

I am curious about something
Q) is the earth part of a 2.5mm (sq) cable only 1.5mm (sq)? If so, why use a blue connector, should you not use a red connector? :scratch:

PS: as I understand it the name "2.5mm T&E" cable means the copper wires has a cross-sectional area of 2.5mm (squared) so the actual diameter is less (1.78mm as I work it out)


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 6:28 pm 
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Doesn't answer your question but,

a, you can get heat shrink crimp connectors, meaning you do not need heat shrink tubing as well;
b, if using heat shrink tubing, you could just solder the wires together in an overlap, meaning you don't need the crimp connectors at all.

You specify a colour, therefore you are insulated crimps, so why use tubing as well?


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 6:33 pm 
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Wagon connector not better for this application?


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 6:36 pm 
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getthewheelsinline wrote:
Wagon connector not better for this application?


Good but not as good as Wago connectors... :lol: :hiding:

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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 6:40 pm 
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arco_iris wrote:
Doesn't answer your question but,

a, you can get heat shrink crimp connectors, meaning you do not need heat shrink tubing as well;
b, if using heat shrink tubing, you could just solder the wires together in an overlap, meaning you don't need the crimp connectors at all.

You specify a colour, therefore you are insulated crimps, so why use tubing as well?



I saw those heat shrink connectors but the ones I have are just the standard insulated butt connectors.

As I understand it, you still need an outer heat shrink over the whole cable (i.e. to replace the grey PVC you strip away.)


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 6:43 pm 
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getthewheelsinline wrote:
Wagon connector not better for this application?


Indeed , but I have a pile of various types of crimp connectors and the Wago ones come in a box of 50 or 100.
No other reason than saving myself a trip to screwfix :wink:


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 6:53 pm 
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I would use a red connector for a 2.5mm ^2 T&E earth core, as it is as you, say 1.5mm^2.

If the crimped connections are not in an existing back box or similar then the heat sleeving is required as you are crimping single cored cables.


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 6:55 pm 
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I stand corrected.


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 6:57 pm 
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OnlyMe wrote:
I would use a red connector for a 2.5mm ^2 T&E earth core, as it is as you, say 1.5mm^2.

If the crimped connections are not in an existing back box or similar then the heat sleeving is required as you are crimping single cored cables.


Excellent, thank you sir! They will be under the floor.


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 7:16 pm 
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Then you can fit them in an adaptable box or choc box.

The same rules apply for wago connectors.


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 7:17 pm 
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I know you don't want a trip to screwfix, but these are cheaper than wago connectors.

https://www.screwfix.com/p/ideal-spliceline-in-line-wire-connectors-pack-of-10/42201


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 7:17 pm 
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you can get wago connectors in small quantity's, I got ten at a local wholesaler, I don't like crimps on mains, I would rather use a J/B (if it can be accessed)

random google link

https://www.tlc-direct.co.uk/Manufactur ... index.html


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 7:30 pm 
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Thanks guys, I forgot about TLC.
I might just get a handful for the tool box anyway


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Mon Jan 15, 2018 7:41 pm 
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Not only TLC, also try CPC, free postage over £5 (exc. vat).

TLC £3.60 under £50 (local to a branch) or £3.90 under £150 (further afield) - plus 20% tax.

DIY_Johnny wrote:
I might just get a handful for the tool box anyway


I get a few from CPC or TLC every time I order other stuff.


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 Post subject: Re: Crimping 2.5mm T&E
PostPosted: Wed Jan 24, 2018 12:01 am 
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I know they use crimps in trunking sometimes.
I was taught to overlap the wires the length of the metal inside the crimp( so lay them together in from each end or whatever), then when you crimp up the crimp it squeezes the whole lot together. You may then require a crimp larger than you might expect for the size of wire, because it is effectively double the thickness. If you are doing a same end crimp then by all means twist together if stranded wire, or lay together as before.

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