Someone asked a similar question to this back in November,
but no-one answered the particular bit I'm interested in.
I'm going to be crimping some 2.5mm T+E together, and
will be using the blue 2.5mm butt crimps at:
I also want to encase it in heat-shrink sleeving.
Do you just sleeve the individual cores, or the whole cable
as well? My instinct would be to put sleeving over each core
seperately, then have a big piece of sleeving to cover the lot
and keep it together.
Depending on the answer, which of these sleeves do I need?
Thanks in advance,
The proper tool (the ratchet one at 12quid) is highly recommended.
If you make them up properly, I don't see the need for individual h/s sleeves
as the crimps have the insulation flared at the ends to accommodate the
insulation on the wire.
Being a picky bugger, I wouldn't make a joint without strain relief, so none
of the above, I'd use adhesive lined heatshrink, which is sadly 5-10quid a
metre, like code 157-3824 or 157-3903 from http://rswww.com , not a
recommended source, just an example, as they are a bit pricey.
Also the RS stuff shrinks 3:1 whereas the tlc stuff only does 2:1 meaning
that 25mm will leave a slack boot or you'd need to be v neat to get the lot
inside a 12mm piece by eg. staggering the joints in L, N & E.
If you must use the cheap stuff, then perhaps double the cable back on
itself (not at the joint) and bind it together with a couple of cable ties as a
That's how I've done it, and I've used glue-lined heatshrink for the job
mostly because it's much heavier guage than standard heatshrink. I'd
reccomend using the glue lined for the cover that goes over everything.
Remember when you apply the final cover to keep it far enough away from
the heat source while you are shrinking the individual sleeves and not
to attempt to position it until the cable has cooled.
I got into amusing difficulties on the first attempt.
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No, but you must only use connectors where the
cable is fastened by a screwing mechanism (e.g.
junction boxes, choc-blocks, henley-blocks etc.)
if it is going to be accessible later.
If you are burying in plaster or leaving under your
flagstone floor, then a 'permanent' connection is
required, which means crimps or solder.
The jury is out on whether "under carpeted floor
boards" is "inaccessible". In a new house where
the boards are the huge chipboard type, I would
say that they were inaccessible. In an older house
with "plank" boards, I would say it was accessible
if the floorboard can be lifted without lifting more
than one carpet.
In my own house I only have junction boxes under
floorboards under "walkway" areas - doorways,
hallways and landings - places were no furniture is
"likely" to be placed. This way they are "accessible".
Any which are just joining up two bits of cable, I
am planning to replace with crimped connections.
Thank you for the illumination. The light bulbs in my head remained
obstinately off while I tried in vain to think of circumstances where I
would want to crimp.
Even in your genuinely inaccessible areas, I would still wonder whether some
re-wiring wouldn't be better than jointing, which would often remain
Marriage: It's not only a word, but a sentence!
Those type of crimps are already insulated, so if you make sure you only
bare the correct length of conductor will be perfectly safe elecrically.
So all you really need is mechanical protection to replace the outer
*The first rule of holes: If you are in one, stop digging!
Dave Plowman email@example.com London SW 12
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