What would cause lots of MCBs to trip together?
 

Three phase DB. Turned up and tried to turn the lights on, to find that all the MCBs controlling circuits with lights (and some without), plus a submain that also had a lights circuit running from the secondary DB, we're off.

The only possibly explanation I can think of is that someone had turned them all off, because they were blindly trying to turn off the lights after working there and hadn't noticed the timer override master switch. Problem with that theory is that in order to turn the lights on in the first place they would have had to know about the override switch!

Is there any possible electrical fault which could trip half a dozen circuits and leave no signs, a maximum of 24 hours since the lights were circuits were last on. There was no evidence of water leakage.

What would cause lots of MCBs to trip together?
 

On Friday, 27 September 2019 09:54:45 UTC+1, wrote:
Three phase DB. Turned up and tried to turn the lights on, to find that all the MCBs controlling circuits with lights (and some without), plus a submain that also had a lights circuit running from the secondary DB, we're off.

The only possibly explanation I can think of is that someone had turned them all off, because they were blindly trying to turn off the lights after working there and hadn't noticed the timer override master switch. Problem with that theory is that in order to turn the lights on in the first place they would have had to know about the override switch!

Is there any possible electrical fault which could trip half a dozen circuits and leave no signs, a maximum of 24 hours since the lights were circuits were last on. There was no evidence of water leakage.

If they have tripped, the toggles would be in the mid position. To reset/turn back on, they have to be turned to the fully "off" position and then "on".
So it should be obvious if they have tripped or been turned off.

What would cause lots of MCBs to trip together?
 

"harry" wrote in message
...
On Friday, 27 September 2019 09:54:45 UTC+1, wrote:
Three phase DB. Turned up and tried to turn the lights on, to find that
all the MCBs controlling circuits with lights (and some without), plus a
submain that also had a lights circuit running from the secondary DB,
we're off.

The only possibly explanation I can think of is that someone had turned
them all off, because they were blindly trying to turn off the lights
after working there and hadn't noticed the timer override master switch.
Problem with that theory is that in order to turn the lights on in the
first place they would have had to know about the override switch!

Is there any possible electrical fault which could trip half a dozen
circuits and leave no signs, a maximum of 24 hours since the lights were
circuits were last on. There was no evidence of water leakage.

If they have tripped, the toggles would be in the mid position. To
reset/turn back on, they have to be turned to the fully "off" position and
then "on".
So it should be obvious if they have tripped or been turned off.

That assumes the MCBs have that design. Ours (MCBs and RCDs) have only two
positions: fully on or fully off - there's no half-way state to say
"tripped" as opposed to "turned off manually".

Maybe it's different for 3-phase distribution boards rather than domestic
1-phase ones.

What would cause lots of MCBs to trip together?
 

wrote in message
...
Three phase DB. Turned up and tried to turn the lights on, to find that
all the MCBs controlling circuits with lights (and some without), plus a
submain that also had a lights circuit running from the secondary DB,
we're off.

The only possibly explanation I can think of is that someone had turned
them all off, because they were blindly trying to turn off the lights
after working there and hadn't noticed the timer override master switch.
Problem with that theory is that in order to turn the lights on in the
first place they would have had to know about the override switch!

One obvious explanation is that a different person turned the
lights on and turned them off.

Is there any possible electrical fault which could trip half a dozen
circuits and leave no signs, a maximum of 24 hours since the lights were
circuits were last on. There was no evidence of water leakage.

What would cause lots of MCBs to trip together?
 

On 27/09/2019 10:49, NY wrote:
"harry" wrote in message
...
On Friday, 27 September 2019 09:54:45 UTC+1, Â* wrote:
Three phase DB. Turned up and tried to turn the lights on, to find
that all the MCBs controlling circuits with lights (and some
without), plus a submain that also had a lights circuit running from
the secondary DB, we're off.

The only possibly explanation I can think of is that someone had
turned them all off, because they were blindly trying to turn off the
lights after working there and hadn't noticed the timer override
master switch. Problem with that theory is that in order to turn the
lights on in the first place they would have had to know about the
override switch!

Is there any possible electrical fault which could trip half a dozen
circuits and leave no signs, a maximum of 24 hours since the lights
were circuits were last on. There was no evidence of water leakage.

If they have tripped, the toggles would be in the mid position. To
reset/turn back on, they have to be turned to the fully "off" position
and then "on".
So it should be obvious if they have trippedÂ* or been turned off.

That assumes the MCBs have that design. Ours (MCBs and RCDs) have only
two positions: fully on or fully off - there's no half-way state to say
"tripped" as opposed to "turned off manually".

Maybe it's different for 3-phase distribution boards rather than
domestic 1-phase ones.
Overvoltage on one or more of the phases can cause breakers to trp


--
Climate Change: Socialism wearing a lab coat.

Lonely Psychopathic Senile Ozzie Troll Alert!
 

On Fri, 27 Sep 2019 20:06:07 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:


One obvious explanation is that a different person turned the
lights on and turned them off.

You'd better worry about that dim bulb in your head, senile Rodent!

--
Bod addressing abnormal senile quarreller Rot:
"Do you practice arguing with yourself in an empty room?"
MID:

What would cause lots of MCBs to trip together?
 

On Friday, 27 September 2019 10:51:10 UTC+1, NY wrote:
"harry" wrote in message
...
On Friday, 27 September 2019 09:54:45 UTC+1, wrote:
Three phase DB. Turned up and tried to turn the lights on, to find that
all the MCBs controlling circuits with lights (and some without), plus a
submain that also had a lights circuit running from the secondary DB,
we're off.

The only possibly explanation I can think of is that someone had turned
them all off, because they were blindly trying to turn off the lights
after working there and hadn't noticed the timer override master switch.
Problem with that theory is that in order to turn the lights on in the
first place they would have had to know about the override switch!

Is there any possible electrical fault which could trip half a dozen
circuits and leave no signs, a maximum of 24 hours since the lights were
circuits were last on. There was no evidence of water leakage.

If they have tripped, the toggles would be in the mid position. To
reset/turn back on, they have to be turned to the fully "off" position and
then "on".
So it should be obvious if they have tripped or been turned off.

That assumes the MCBs have that design. Ours (MCBs and RCDs) have only two
positions: fully on or fully off - there's no half-way state to say
"tripped" as opposed to "turned off manually".

Maybe it's different for 3-phase distribution boards rather than domestic
1-phase ones.

Well it is "UK" diy
On a 3 phase board you can have both single and three phase MCBs.

What would cause lots of MCBs to trip together?
 

On 27/09/2019 16:38, harry wrote:

On a 3 phase board you can have both single and three phase MCBs.



Can some one add that to the Ladybird book of electrics?


--
Adam

What would cause lots of MCBs to trip together?
 

On 27/09/2019 09:54, wrote:
Three phase DB. Turned up and tried to turn the lights on, to find that all the MCBs controlling circuits with lights (and some without), plus a submain that also had a lights circuit running from the secondary DB, we're off.

The only possibly explanation I can think of is that someone had turned them all off, because they were blindly trying to turn off the lights after working there and hadn't noticed the timer override master switch. Problem with that theory is that in order to turn the lights on in the first place they would have had to know about the override switch!

Is there any possible electrical fault which could trip half a dozen circuits and leave no signs, a maximum of 24 hours since the lights were circuits were last on. There was no evidence of water leakage.



There is only one explanation.

Some pillock has turned the MCBs off.


--
Adam

What would cause lots of MCBs to trip together?
 

There have been lots of storms, maybe a spike did it.
Brian

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"The Natural Philosopher" wrote in message
...
On 27/09/2019 10:49, NY wrote:
"harry" wrote in message
...
On Friday, 27 September 2019 09:54:45 UTC+1, wrote:
Three phase DB. Turned up and tried to turn the lights on, to find that
all the MCBs controlling circuits with lights (and some without), plus
a submain that also had a lights circuit running from the secondary DB,
we're off.

The only possibly explanation I can think of is that someone had turned
them all off, because they were blindly trying to turn off the lights
after working there and hadn't noticed the timer override master
switch. Problem with that theory is that in order to turn the lights on
in the first place they would have had to know about the override
switch!

Is there any possible electrical fault which could trip half a dozen
circuits and leave no signs, a maximum of 24 hours since the lights
were circuits were last on. There was no evidence of water leakage.

If they have tripped, the toggles would be in the mid position. To
reset/turn back on, they have to be turned to the fully "off" position
and then "on".
So it should be obvious if they have tripped or been turned off.

That assumes the MCBs have that design. Ours (MCBs and RCDs) have only
two positions: fully on or fully off - there's no half-way state to say
"tripped" as opposed to "turned off manually".

Maybe it's different for 3-phase distribution boards rather than domestic
1-phase ones.
Overvoltage on one or more of the phases can cause breakers to trp


--
Climate Change: Socialism wearing a lab coat.

What would cause lots of MCBs to trip together?
 

On 27/09/2019 20:56, ARW wrote:
On 27/09/2019 09:54, wrote:
Three phase DB. Turned up and tried to turn the lights on, to find
that all the MCBs controlling circuits with lights (and some without),
plus a submain that also had a lights circuit running from the
secondary DB, we're off.

The only possibly explanation I can think of is that someone had
turned them all off, because they were blindly trying to turn off the
lights after working there and hadn't noticed the timer override
master switch.Â* Problem with that theory is that in order to turn the
lights on in the first place they would have had to know about the
override switch!

Is there any possible electrical fault which could trip half a dozen
circuits and leave no signs, a maximum of 24 hours since the lights
were circuits were last on. There was no evidence of water leakage.



There is only one explanation.

Some pillock has turned the MCBs off.



Turn them on, and put some superglue on the MCB tabs then
you will catch the culprit next time :-)

What would cause lots of MCBs to trip together?
 

Brian Gaff wrote

There have been lots of storms, maybe a spike did it.

Nope, spikes don’t do that.

"The Natural Philosopher" wrote in message
...
On 27/09/2019 10:49, NY wrote:
"harry" wrote in message
...
On Friday, 27 September 2019 09:54:45 UTC+1, wrote:
Three phase DB. Turned up and tried to turn the lights on, to find
that all the MCBs controlling circuits with lights (and some without),
plus a submain that also had a lights circuit running from the
secondary DB, we're off.

The only possibly explanation I can think of is that someone had
turned them all off, because they were blindly trying to turn off the
lights after working there and hadn't noticed the timer override
master switch. Problem with that theory is that in order to turn the
lights on in the first place they would have had to know about the
override switch!

Is there any possible electrical fault which could trip half a dozen
circuits and leave no signs, a maximum of 24 hours since the lights
were circuits were last on. There was no evidence of water leakage.

If they have tripped, the toggles would be in the mid position. To
reset/turn back on, they have to be turned to the fully "off" position
and then "on".
So it should be obvious if they have tripped or been turned off.

That assumes the MCBs have that design. Ours (MCBs and RCDs) have only
two positions: fully on or fully off - there's no half-way state to say
"tripped" as opposed to "turned off manually".

Maybe it's different for 3-phase distribution boards rather than
domestic 1-phase ones.
Overvoltage on one or more of the phases can cause breakers to trp

Lonely Psychopathic Senile Ozzie Troll Alert!
 

On Sun, 29 Sep 2019 04:43:23 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:


Nope

Another tiny tiny little senile climax for you again, eh, senile Rodent? LOL

--
Website (from 2007) dedicated to the 85-year-old trolling senile
cretin from Oz:
https://www.pcreview.co.uk/threads/r...d-faq.2973853/