Archibald Tarquin Blenkinsopp wrote:

On Sun, 27 Jan 2019 11:32:36 +0000, ss wrote:

On 27/01/2019 11:29, wrote:
On Sunday, 27 January 2019 10:36:14 UTC, ss wrote:
Light switch 2 gang both are 2-way.
The stair switch works ok at the top of stairs, at bottom stairs it only
works dependent on the position of the upstair switch.
I opened up and there appears to be a loose wire, can someone please
confirm that the yellow wire is needing reconnected as per image.

https://imgur.com/a/pnUTTWQ

2 way 2 gang switch requires 6 connections, the yellow coming off is
certainly the most likely explanation.


NT

OK now sorted and switch working ok now, it was the yellow wire come loose.

You are not concerned as to why? The yellow wire was just sitting in a
light switch back box, perfectly sound doing it's job, then one day it
falls out.

I must have missed the acceptable time period requirements for cable
retention when I did the 17th :-)

AB

The wiring regs certainly envisage screw terminals failing, and don't
seem to mandate cable retention in light switches at all.

The contact failed because either;

- it was never screwed up properly (and this would not stop it working
for an uncertain period);

- vibration from switching caused the screw to unscrew;

- or the copper gradually deformed under pressure;


The wire fell out when the switch was opened for examination.

Nothing out of the ordinary.

--

Roger Hayter