Matthew

Crimp yes, tin no! If you tin stranded wire and then clamp it under a screw terminal,
the solder will creep under the pressure, especially if there is any vibration, and the
connection will, in time work loose, creating all sorts of havoc, including fire
(witnessed in a high power circuit). If you must solder, use a sleeve, making sure the
tinning does not go on the part under the terminal.

Brian

Matthew Lamkin wrote:

> Hiya gang.... are we all over the flurry of excitement of love letters?
> This has only been the beginning....wait till all the stolen password
> start getting used...If you've been hit then better change em all quick.
>
> Our system ground to a halt, not because of the message itself, but
> because of the anti-virus software measures taken to prevent it
> striking...
> poignant eh!!
>
> Anyhow......what I want to know is:
>
> When terminating some wires leading from a PCB to a terminal block, what
> are the pro's and con's
> of soldering the twisted ends or not soldering them?
>
> The wires are 7/0.2mm and 3" long.
> Strain relief does not appear to be a problem.
> The terminals are KRESS 4 with screw clamps in place.
>
> Personally I do not like putting un crimped or un soldered wires into
> terminals as they invariably get a few strands poking out
> which can cause problems.
>
> I'd like to tell the assembly people that they should be stripped,
> twisted & tinned rather than crimped (which takes longer/costs more).
> and would like to be able to back it up (or know "not" to do it) with
> more knowledge than little old me got.
>
> P.S. before they are quoted, we do not assemble to IPC specs.
>
> Many thanks :-
> Matthew Lamkin
> Printed Circuitboard Draughtsman
> Protec Fire Detection PLC.
> England , UK, The World.
> Email [log in to unmask]
> (please only use this email address when sending to or replying to this
> message)
>
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> by the
> employee then that's Okidoki !
>
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