A bit of a flash as the cable popped out of the terminal block and
touched the earthed light fitting.

Now I would have expected the MCB to have tripped, however power was
still on.

So a long trip to the DB only to find the MCB HAD tripped - well it was
in the off position.

I turned the MCB back on and then off and it killed the power (and all
the lights in reception leaving some very unhappy looking people in the
dark).

Never seen that one before. I have seen plenty of MCBs in the ON
position not letting power through but never this way around.



--
Adam

On Saturday, 9 December 2017 08:23:08 UTC, ARW wrote:
A bit of a flash as the cable popped out of the terminal block and
touched the earthed light fitting.

Now I would have expected the MCB to have tripped, however power was
still on.

So a long trip to the DB only to find the MCB HAD tripped - well it was
in the off position.

I turned the MCB back on and then off and it killed the power (and all
the lights in reception leaving some very unhappy looking people in the
dark).

Never seen that one before. I have seen plenty of MCBs in the ON
position not letting power through but never this way around.



--
Adam

Points/contacts welded together??

Probably gave the spider living inside a very bad day though.
I would replace it just in case, you definitely do not want that kind of
thing going on in a public building.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"ARW" wrote in message
news
A bit of a flash as the cable popped out of the terminal block and touched
the earthed light fitting.

Now I would have expected the MCB to have tripped, however power was still
on.

So a long trip to the DB only to find the MCB HAD tripped - well it was in
the off position.

I turned the MCB back on and then off and it killed the power (and all the
lights in reception leaving some very unhappy looking people in the dark).

Never seen that one before. I have seen plenty of MCBs in the ON position
not letting power through but never this way around.



--
Adam

On Saturday, 9 December 2017 08:23:08 UTC, ARW wrote:
A bit of a flash as the cable popped out of the terminal block and
touched the earthed light fitting.

Working live, naughty boy!

I turned the MCB back on and then off and it killed the power (and all
the lights in reception leaving some very unhappy looking people in
the dark).

Ah! You can now sell them some emergency lighting. Not sure how you'll fit it without turning the power off ...

Owain

On 09/12/2017 08:23, ARW wrote:
A bit of a flash as the cable popped out of the terminal block and
touched the earthed light fitting.

Now I would have expected the MCB to have tripped, however power was
still on.

So a long trip to the DB only to find the MCB HAD tripped - well it was
in the off position.

I turned the MCB back on and then off and it killed the power (and all
the lights in reception leaving some very unhappy looking people in the
dark).

Never seen that one before. I have seen plenty of MCBs in the ON
position not letting power through but never this way around.


every problem is an opportunity

- sell them current injection testing of all their DBs (at premium
evening/weekend rates to avoid disruption of business)

- report to Electrical Safety First and suggest they lobby for current
injection testing to be made part of compulsory quinquennial EICRs
(gives you more work in future years - though best if you have an
apprentice to carry the kit if it's still like the only set I ever saw
in action)



--
Robin
reply-to address is (intended to be) valid

It might have just been a too heavy light shade of course

Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
wrote in message
...
On Saturday, 9 December 2017 08:23:08 UTC, ARW wrote:
A bit of a flash as the cable popped out of the terminal block and
touched the earthed light fitting.

Working live, naughty boy!

I turned the MCB back on and then off and it killed the power (and all
the lights in reception leaving some very unhappy looking people in
the dark).

Ah! You can now sell them some emergency lighting. Not sure how you'll
fit it without turning the power off ...

Owain

On Sat, 9 Dec 2017 08:23:04 +0000, ARW
coalesced the vapors of human
experience into a viable and meaningful comprehension...

A bit of a flash as the cable popped out of the terminal block and
touched the earthed light fitting.

Now I would have expected the MCB to have tripped, however power was
still on.

So a long trip to the DB only to find the MCB HAD tripped - well it was
in the off position.

I turned the MCB back on and then off and it killed the power (and all
the lights in reception leaving some very unhappy looking people in the
dark).

Never seen that one before. I have seen plenty of MCBs in the ON
position not letting power through but never this way around.


Counterfeit MCB?
Wylex model that was subject to a recall?

https://www.youtube.com/watch?v=JbyTHlx4tQM
--

Graham.
%Profound_observation%

On 09/12/2017 18:33, Graham. wrote:
On Sat, 9 Dec 2017 08:23:04 +0000, ARW
coalesced the vapors of human
experience into a viable and meaningful comprehension...

A bit of a flash as the cable popped out of the terminal block and
touched the earthed light fitting.

Now I would have expected the MCB to have tripped, however power was
still on.

So a long trip to the DB only to find the MCB HAD tripped - well it was
in the off position.

I turned the MCB back on and then off and it killed the power (and all
the lights in reception leaving some very unhappy looking people in the
dark).

Never seen that one before. I have seen plenty of MCBs in the ON
position not letting power through but never this way around.


Counterfeit MCB?
Wylex model that was subject to a recall?

https://www.youtube.com/watch?v=JbyTHlx4tQM


MEM 1980's installation.

--
Adam

"ARW" wrote in message
news
A bit of a flash as the cable popped out of the terminal block and touched
the earthed light fitting.

Now I would have expected the MCB to have tripped, however power was still
on.

So a long trip to the DB only to find the MCB HAD tripped - well it was in
the off position.

I turned the MCB back on and then off and it killed the power (and all the
lights in reception leaving some very unhappy looking people in the dark).

Never seen that one before. I have seen plenty of MCBs in the ON position
not letting power through but never this way around.

Obviously made in china.

On Sat, 9 Dec 2017 02:24:12 -0800 (PST)
wrote:

On Saturday, 9 December 2017 08:23:08 UTC, ARW wrote:
A bit of a flash as the cable popped out of the terminal block and
touched the earthed light fitting.

Working live, naughty boy!

Those of us with special training are permitted to do that. :-)

On Monday, 11 December 2017 23:27:54 UTC, Rob Morley wrote:
On Sat, 9 Dec 2017 02:24:12 -0800 (PST)
wrote:

On Saturday, 9 December 2017 08:23:08 UTC, ARW wrote:
A bit of a flash as the cable popped out of the terminal block and
touched the earthed light fitting.

Working live, naughty boy!

Those of us with special training are permitted to do that. :-)

But only when working when posting they seem particualy brain dead. :-)