"Archibald Tarquin Blenkinsopp" wrote in
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On Mon, 28 Jan 2019 06:43:14 +1100, "Steven" wrote:



"Archibald Tarquin Blenkinsopp" wrote in
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On Sun, 27 Jan 2019 17:35:06 GMT, Harry Bloomfield
wrote:

It happens that Roger Hayter formulated :
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;

It looks to me as if the copper core failed and snapped, leaving the
copper part still in the terminal. Possibly the installer nicked the
copper as he stripped the insulation and it subsequently snapped. Poor
or careless technique.

Probably repeated in other parts of the installation.

But it isn't actually viable to completely redo all the terminals in the
entire house now. Given that the wiring standards are fail safe by
design, it make more sense to fix any others that do fail when they do.

You steamin' great pillock! Fail safe by design?? No such bloody
thing unless you are working to ATEX standards.

Have you seen a glass rod conduct electricity to the point where it
melts and arcs.

Doesn't happen in the sort of house the fault was in.

Have you examined insulation that has been drenched and suddenly
become conductive.

The RCBO system fails safe in that situation.

Wothout an earth path the MCB has no clue whether the couple of kW is
a genuine heating element or a L-N leakage path.

Isnt going to happen with that 2 way light switch circuit.

Likewise although a switch alone is perfectly capable of providing an
audio visual indication of a gas build up, a loose connection will
give the indication a lot earlier and with a higher level of success.

Yeah, yeah, the entire house should be completely rewired now that that
one wire was clearly not as competently done as it should have been.

Easy to see why no one would employ you in britain and you had to
move to ireland and then even they noticed how unemployable you are.