On Thu, 18 Feb 2021 14:58:43 +0000, Dave Plowman (News) wrote:

In article ,
jon wrote:
On Thu, 18 Feb 2021 11:27:07 +0000, Dave Plowman (News) wrote:

In article ,
RJH wrote:
I'm having some difficulty getting a decent join connecting 2 bits
of 80 strand speaker cable using my cheap but reasonable (CPC IIRC,
and the crimps) crimp connectors. The wire, or rather one side, is
quite easy to pull from the connector. I've tried adjusting the tool
and various permutations, but it's looking like solder, as this
bloke found too:

https://youtu.be/nvPESov0HbY (from about 5.30)

I've used them before on solid cable and they seemed fine. Not sure
why they're not working now . . .

These universal crimps (red bluse and yellow) are the spawn of the
devil.

Make one using the very best tool and then cut off the insulation.
And compare the crimp to a proper one, done with a heart shaped tool
on the metal of the terminal.

I have never had any trouble, providing one uses the correct crimp.
Obviously a crimp for 70/0076 would not fit 14/0076 wire...be like a
prick in a bonnet.

A decent crimp attempts to make a gas tight seal between terminal and
conductor. Simply crushing something flat can't get near acheiving this.
I've come across lots of those pre-insulated crimps used on old cars and
being the source of the problem - apart from looking like a bodge. They
may work better on single strand wire, though. But I've never needed to
use them on domestic wiring.

I have put crimps on my speaker wires and various mains terminal blocks in
the past and it has been quite successful. I have a range of cable crimps,
including double ended in line connector, round, male spade, pin and
female spade. These are all with coloured insulated collars. These crimp
pliers do not crush flat, but they apply a semi folding action to shorten
the compression ring circumference. I have used these on cars in the past
when fitting accessories and never had trouble. One of my crimpers can
also use extended ferrule crimps to clamp over the cable insulation.