Yes in hard to reach places tinned ends can squash over time, but a look at
most devices supplied with no plug from back then, most were in some way
tinned
Any connection can and does work loose. I remember the electrician many
moons ago who did this house suggested I tested and tightened all socket and
lightswitch and bayonet screws about a year on from the finish of the job.
many were not as tight as they had been for whatever reason.
Brian

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"Archibald Tarquin Blenkinsopp" wrote in
message news
On Mon, 7 May 2018 10:27:52 +0100, "Brian Gaff"
wrote:

Should etc, and some wire just seems to come untwisted when flattened. i
guess you could tin the twisted ends but that is not always an easy thing
to
do in situ.
Brian
That I'm afraid is a definite no no. Some misguided manufacturers
tinned the ends of cables when appliances were supplied plugless.

The tinning used to "flow" away from the point of pressure.

Being cheapskates my company will often provide individual JB,s for
sensors etc and if the spec does not call for it, a chunk of
chockstrip is the norm.

The field wiring is 1.5mm, the sensor can be a few whiskers. Taking
both cables through the connector, so that each one is clamped by both
screws secures things nicely. Bootlaces are fine, but if those are
being used it is easier to go the whole hog and stick a few DIN
terminals in the box along with a short bit of rail.

AB