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Nuisance tripping RCD - down to oven I think?
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Lobster
Mar 18, 2013, 11:20:48 AM3/18/13
to
Am having a hell of a time with nuisance tripping at the moment. It
happens intermittently, and when it does, you can just immediately flip
the breaker back and it works again. So it's very hard to localise.
It's definitely in the kitchen; and I'm fairly sure it happens when the
oven's on; but seems it may be more likely when the microwave's on as well?
When it does trip, it's the main RCD which goes; however sometimes an
individual MCB flips as well. I hadn't particularly noticed which one,
but I this morning I spotted that it was the main ringmain for all
sockets in the house *other* than the kitchen! (the oven has a
dedicated radial, and the kitchen sockets - including microwave - are on
another MCB).
First question - do the above observations add up at all? The MCB thing
makes no sense to me at all; I wonder if today's observation was just a
one-off oddity today?
The first time this happened I thought (well, assumed, as I'd
experienced this before) the problem was a duff element in the oven and
just ordered a new one; when it arrived though (during which time
there'd been no more trips) I checked the old and new with a multimeter,
found identical resistance across terminals (20 ohms IIRC) and to earth
(open circuit) and decided I'd been wrong, so returned the new element
unused. Now wondering if I was incorrect in doing so. Could there be
undetected earth leakage (which I don't have kit to detect? Could it be
somewhere else in the oven? Or the house wiring? Oven is a built-in one
about 10 years old; main element was replaced about 9 months ago.
Right now I'm really confused - I don't know whether I should be looking
at appliances (which!?) or wiring. I'd happily buy a new bloody oven if
that would definitely solve it, but I am concerned it might not!
Problem's really made worse by being intermittent, and because it seems
to involve appliances we really can't do without.
Any advice on how to proceed most welcome!
--
David
happens intermittently, and when it does, you can just immediately flip
the breaker back and it works again. So it's very hard to localise.
It's definitely in the kitchen; and I'm fairly sure it happens when the
oven's on; but seems it may be more likely when the microwave's on as well?
When it does trip, it's the main RCD which goes; however sometimes an
individual MCB flips as well. I hadn't particularly noticed which one,
but I this morning I spotted that it was the main ringmain for all
sockets in the house *other* than the kitchen! (the oven has a
dedicated radial, and the kitchen sockets - including microwave - are on
another MCB).
First question - do the above observations add up at all? The MCB thing
makes no sense to me at all; I wonder if today's observation was just a
one-off oddity today?
The first time this happened I thought (well, assumed, as I'd
experienced this before) the problem was a duff element in the oven and
just ordered a new one; when it arrived though (during which time
there'd been no more trips) I checked the old and new with a multimeter,
found identical resistance across terminals (20 ohms IIRC) and to earth
(open circuit) and decided I'd been wrong, so returned the new element
unused. Now wondering if I was incorrect in doing so. Could there be
undetected earth leakage (which I don't have kit to detect? Could it be
somewhere else in the oven? Or the house wiring? Oven is a built-in one
about 10 years old; main element was replaced about 9 months ago.
Right now I'm really confused - I don't know whether I should be looking
at appliances (which!?) or wiring. I'd happily buy a new bloody oven if
that would definitely solve it, but I am concerned it might not!
Problem's really made worse by being intermittent, and because it seems
to involve appliances we really can't do without.
Any advice on how to proceed most welcome!
--
David
Bob Minchin
Mar 18, 2013, 12:18:46 PM3/18/13
to
leaks to earth, none of which will cause a trip in its own right but in
combination can add up to enough to cause a trip.
The only real way is to measure the differential current in the likely
candidates and fix them 1 by one.
Immersion heaters are another favourite problem source. Even when not
used, can give an earth to neutral leak. Disconnect completely if you
are not using it whilst testing.
Some electrical leaks will only be present when a voltage is present and
perhaps say a heating element is hot.
Brian Gaff
Mar 18, 2013, 12:39:17 PM3/18/13
to
This never happened with fuses. I'm often suspicious that these detectors
are now more electronic than mechanical and as such prone to all sorts of
interference causing them to trip for an invalid reason. Can you not try
some alternative trips just in case its fooling you?
Brian
--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email: bri...@blueyonder.co.uk
______________________________________________________________________________________________________________
"Bob Minchin" <bob.minc...@YOURHATntlworld.com> wrote in message
news:ki7em5$u2o$1...@dont-email.me...
are now more electronic than mechanical and as such prone to all sorts of
interference causing them to trip for an invalid reason. Can you not try
some alternative trips just in case its fooling you?
Brian
--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email: bri...@blueyonder.co.uk
______________________________________________________________________________________________________________
"Bob Minchin" <bob.minc...@YOURHATntlworld.com> wrote in message
news:ki7em5$u2o$1...@dont-email.me...
ARW
Mar 18, 2013, 12:39:35 PM3/18/13
to
ever resets the MCB when it trips notes which one it is.
Any outside circuits on the RCD? I am thinking wet weather and NOT the oven
may be the cause. If it was the oven I would (in most cases) expect it to
happen every time the oven was used.
Good luck.
--
Adam
Jim K
Mar 18, 2013, 12:51:02 PM3/18/13
to
it may be only when a certain (failing) element is in use...
Jim K
John Rumm
Mar 18, 2013, 2:05:22 PM3/18/13
to
On 18/03/2013 15:20, Lobster wrote:
> Am having a hell of a time with nuisance tripping at the moment. It
> happens intermittently, and when it does, you can just immediately flip
> the breaker back and it works again. So it's very hard to localise.
> It's definitely in the kitchen; and I'm fairly sure it happens when the
> oven's on; but seems it may be more likely when the microwave's on as well?
>
> When it does trip, it's the main RCD which goes; however sometimes an
> individual MCB flips as well. I hadn't particularly noticed which one,
> but I this morning I spotted that it was the main ringmain for all
> sockets in the house *other* than the kitchen! (the oven has a
> dedicated radial, and the kitchen sockets - including microwave - are on
> another MCB).
>
> First question - do the above observations add up at all? The MCB thing
> makes no sense to me at all; I wonder if today's observation was just a
> one-off oddity today?
It suggests that your problem may be deeper than just excess earth
> Am having a hell of a time with nuisance tripping at the moment. It
> happens intermittently, and when it does, you can just immediately flip
> the breaker back and it works again. So it's very hard to localise.
> It's definitely in the kitchen; and I'm fairly sure it happens when the
> oven's on; but seems it may be more likely when the microwave's on as well?
>
> When it does trip, it's the main RCD which goes; however sometimes an
> individual MCB flips as well. I hadn't particularly noticed which one,
> but I this morning I spotted that it was the main ringmain for all
> sockets in the house *other* than the kitchen! (the oven has a
> dedicated radial, and the kitchen sockets - including microwave - are on
> another MCB).
>
> First question - do the above observations add up at all? The MCB thing
> makes no sense to me at all; I wonder if today's observation was just a
> one-off oddity today?
leakage. A MCB trip can only be the result of wither overload or very
brief (and very high) current surges on the circuit it is protecting.
For an overload on a 32A MCB you would need to be pulling a significant
long term current (it should handle 40A indefinitely for example)
However the combination of high ish earth leakage (i.e. not enough to
trip the RCD on its own - but "sensitising" it - moving it close to
tripping, combined with a large transient (i.e. load switching on or
off) can be enough to trip the RCD.
> The first time this happened I thought (well, assumed, as I'd
> experienced this before) the problem was a duff element in the oven and
> just ordered a new one; when it arrived though (during which time
> there'd been no more trips) I checked the old and new with a multimeter,
> found identical resistance across terminals (20 ohms IIRC) and to earth
> (open circuit) and decided I'd been wrong, so returned the new element
> unused. Now wondering if I was incorrect in doing so. Could there be
> undetected earth leakage (which I don't have kit to detect? Could it be
> somewhere else in the oven? Or the house wiring? Oven is a built-in one
> about 10 years old; main element was replaced about 9 months ago.
oven is a plug in type, then withdrawing the plug, bridging L & N
together, and then measuring the resistance between L+N to E on a 500V
range would eliminate that from your enquires.
(last time I went looking for an oven tripping problem, it eventually
came down to the lady of the house being a touch over enthusiastic while
wiping down some tiles near the oven, and allowing water to drip into
the plug! Needless to say I had the whole oven apart testing the
element, fan, lamp etc right back until I had nothing but a plug on the
end of a bit of flex that was still reading low!)
> Right now I'm really confused - I don't know whether I should be looking
> at appliances (which!?) or wiring. I'd happily buy a new bloody oven if
> that would definitely solve it, but I am concerned it might not!
> Problem's really made worse by being intermittent, and because it seems
> to involve appliances we really can't do without.
>
> Any advice on how to proceed most welcome!
--
Cheers,
John.
/=================================================================\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\=================================================================/
Bill
Mar 18, 2013, 2:20:51 PM3/18/13
to
In message <ki7ft6$66k$1...@dont-email.me>, ARW
<adamwa...@blueyonder.co.uk> writes
his tea.
We discovered that the oven RCD also fed the "plant room" at the other
side of the garden and the lights up his path. The plant room had
another set of breakers feeding (we think) a faulty light on the garden
wall, a summerhouse (with leaking roof that we still haven't fixed) and
on from there to the pump in the fish pond via a weatherproof box.
It took an awful lot of walking before we isolated the problem to the
weatherproof box. He rewired this and he is now able to rely on hot
meals again.
I may be asking about pond pumps later, because the took the opportunity
to replace the impeller/rotor assembly in the pump. The new one looks
identical to the old, but not worn, turns freely on its shaft and seems
to have equally strong magnets in the same places on the rotor, but the
pump doesn't run when we install it. The old one is now back in there
and the fish seem happy again.
The house has some other rather eccentric wiring.
--
Bill
<adamwa...@blueyonder.co.uk> writes
>Any outside circuits on the RCD? I am thinking wet weather and NOT the
>oven may be the cause. If it was the oven I would (in most cases)
>expect it to happen every time the oven was used.
My son had the oven occasionally powering down in the middle of cooking
>oven may be the cause. If it was the oven I would (in most cases)
>expect it to happen every time the oven was used.
his tea.
We discovered that the oven RCD also fed the "plant room" at the other
side of the garden and the lights up his path. The plant room had
another set of breakers feeding (we think) a faulty light on the garden
wall, a summerhouse (with leaking roof that we still haven't fixed) and
on from there to the pump in the fish pond via a weatherproof box.
It took an awful lot of walking before we isolated the problem to the
weatherproof box. He rewired this and he is now able to rely on hot
meals again.
I may be asking about pond pumps later, because the took the opportunity
to replace the impeller/rotor assembly in the pump. The new one looks
identical to the old, but not worn, turns freely on its shaft and seems
to have equally strong magnets in the same places on the rotor, but the
pump doesn't run when we install it. The old one is now back in there
and the fish seem happy again.
The house has some other rather eccentric wiring.
--
Bill
meow...@care2.com
Mar 18, 2013, 4:28:40 PM3/18/13
to
On Monday, March 18, 2013 3:20:48 PM UTC, Lobster wrote:
> Am having a hell of a time with nuisance tripping at the moment. It
You need to troubleshoot, or your efforts will mostly be in vain. I'd insulation test every appliance first.
> Am having a hell of a time with nuisance tripping at the moment. It
NT
Windmill
Mar 19, 2013, 7:29:54 AM3/19/13
to
Jim K <jk98...@gmail.com> writes:
>> > Am having a hell of a time with nuisance tripping at the moment. =A0It
>> > localise. It's definitely in the kitchen; and I'm fairly sure it happen=
>> > doing so. =A0Could there be undetected earth leakage (which I don't
>> > have kit to detect? =A0Could it be somewhere else in the oven? Or the
>> > house wiring? =A0Oven is a built-in one about 10 years old; main
the RCD on grill or convection settings. Almost certainly a duff
heating element, and as it's an old Comet CombiChef spares may be a
problem.
Elsewhere I have a socket (which I haven't yet checked because it's in a
rather inaccessible place) which probably has an N to E fault as discussed
before on this NG.
The symptoms are that if a vacuum cleaner (which is OK on other
circuits and shows no fault on a multimeter check) is plugged in there,
random trips occur, once when something heavy fell over causing floor
vibration, once when the vacuum was turned on, and once when a light
switch was turned on *elsewhere*.
But nothing except the RCD is affected.
None of this happens after the plug has been removed from that socket.
I'm expecting to find bad neutral or earth insulation behind the
faceplate.
--
Windmill, Til...@Nonetel.com Use t m i l l
J.R.R. Tolkien:- @ O n e t e l . c o m
All that is gold does not glister / Not all who wander are lost
>> > Am having a hell of a time with nuisance tripping at the moment. =A0It
>> > happens intermittently, and when it does, you can just immediately
>> > flip the breaker back and it works again. =A0So it's very hard to
>> > localise. It's definitely in the kitchen; and I'm fairly sure it happen=
>s
>> > when
>> > the oven's on; but seems it may be more likely when the microwave's
>> > on as well?
>> > When it does trip, it's the main RCD which goes; however sometimes an
>> > individual MCB flips as well. I hadn't particularly noticed which one,
>> > but I this morning I spotted that it was the main ringmain for all
>> > sockets in the house *other* than the kitchen! =A0(the oven has a
>> > when
>> > the oven's on; but seems it may be more likely when the microwave's
>> > on as well?
>> > When it does trip, it's the main RCD which goes; however sometimes an
>> > individual MCB flips as well. I hadn't particularly noticed which one,
>> > but I this morning I spotted that it was the main ringmain for all
>> > dedicated radial, and the kitchen sockets - including microwave - are
>> > on another MCB).
>>
>> > First question - do the above observations add up at all? =A0The MCB
>> > on another MCB).
>>
>> > thing makes no sense to me at all; I wonder if today's observation
>> > was just a one-off oddity today?
>>
>> > The first time this happened I thought (well, assumed, as I'd
>> > experienced this before) the problem was a duff element in the oven
>> > and just ordered a new one; when it arrived though (during which time
>> > there'd been no more trips) I checked the old and new with a
>> > multimeter, found identical resistance across terminals (20 ohms
>> > IIRC) and to earth (open circuit) and decided I'd been wrong, so
>> > returned the new element unused. =A0Now wondering if I was incorrect in
>> > was just a one-off oddity today?
>>
>> > The first time this happened I thought (well, assumed, as I'd
>> > experienced this before) the problem was a duff element in the oven
>> > and just ordered a new one; when it arrived though (during which time
>> > there'd been no more trips) I checked the old and new with a
>> > multimeter, found identical resistance across terminals (20 ohms
>> > IIRC) and to earth (open circuit) and decided I'd been wrong, so
>> > doing so. =A0Could there be undetected earth leakage (which I don't
>> > have kit to detect? =A0Could it be somewhere else in the oven? Or the
>> > house wiring? =A0Oven is a built-in one about 10 years old; main
>> > element was replaced about 9 months ago.
>> > Right now I'm really confused - I don't know whether I should be
>> > looking at appliances (which!?) or wiring. =A0I'd happily buy a new
>> > Right now I'm really confused - I don't know whether I should be
>> > bloody oven if that would definitely solve it, but I am concerned it
>> > might not!
>> > Problem's really made worse by being intermittent, and because it
>> > seems to involve appliances we really can't do without.
>>
>> > Any advice on how to proceed most welcome!
>>
>> Check that the labels actually do match the MCB circuits! And make sure w=
>> > might not!
>> > Problem's really made worse by being intermittent, and because it
>> > seems to involve appliances we really can't do without.
>>
>> > Any advice on how to proceed most welcome!
>>
>ho
>> ever resets the MCB when it trips notes which one it is.
>>
>> Any outside circuits on the RCD? I am thinking wet weather and NOT the ov=
>> ever resets the MCB when it trips notes which one it is.
>>
>en
>> may be the cause. If it was the oven I would (in most cases) expect it to
>> happen every time the oven was used.
>also if a multi-element oven (fan, conventional top/bottom, grill etc)
>it may be only when a certain (failing) element is in use...
Yes, I have a combination oven which is OK on microwave only, but trips
>> may be the cause. If it was the oven I would (in most cases) expect it to
>> happen every time the oven was used.
>also if a multi-element oven (fan, conventional top/bottom, grill etc)
>it may be only when a certain (failing) element is in use...
the RCD on grill or convection settings. Almost certainly a duff
heating element, and as it's an old Comet CombiChef spares may be a
problem.
Elsewhere I have a socket (which I haven't yet checked because it's in a
rather inaccessible place) which probably has an N to E fault as discussed
before on this NG.
The symptoms are that if a vacuum cleaner (which is OK on other
circuits and shows no fault on a multimeter check) is plugged in there,
random trips occur, once when something heavy fell over causing floor
vibration, once when the vacuum was turned on, and once when a light
switch was turned on *elsewhere*.
But nothing except the RCD is affected.
None of this happens after the plug has been removed from that socket.
I'm expecting to find bad neutral or earth insulation behind the
faceplate.
--
Windmill, Til...@Nonetel.com Use t m i l l
J.R.R. Tolkien:- @ O n e t e l . c o m
All that is gold does not glister / Not all who wander are lost
Lobster
Mar 19, 2013, 9:24:06 AM3/19/13
to
On 18/03/2013 18:05, John Rumm wrote:
> On 18/03/2013 15:20, Lobster wrote:
>> Right now I'm really confused - I don't know whether I should be looking
>> at appliances (which!?) or wiring. I'd happily buy a new bloody oven if
>> that would definitely solve it, but I am concerned it might not!
>
> You may be barking up the wrong tree.
Hmm, I've just been advised there's been a bit of domestic confusion
> On 18/03/2013 15:20, Lobster wrote:
>> Right now I'm really confused - I don't know whether I should be looking
>> at appliances (which!?) or wiring. I'd happily buy a new bloody oven if
>> that would definitely solve it, but I am concerned it might not!
>
> You may be barking up the wrong tree.
about what's causing the trip; apparently our temporarily resident
daughter has been trying to switch to grill mode without realising[1],
when using the oven which (a) may have damaged something and (b)
accounts for some of the muddle. In the interim no more trips so
hopefully it's the grill element. But need to investigate further when
I have a bit of time.
>> Problem's really made worse by being intermittent, and because it seems
>> to involve appliances we really can't do without.
>>
>> Any advice on how to proceed most welcome!
>
> What test equipment do you have access to?
[1] to be fair the icons on the oven dial are completely bizarre and
incomprehensible - I just use it at the "4 o'clock" position without
paying any attention to the icons)
--
David
charles
Mar 19, 2013, 12:18:48 PM3/19/13
to
In article <mFZ1t.111405$eU7....@fx24.fr7>,
grill. You will need a "megger" or PAT tester which uses at least 250v
--
From KT24
Using a RISC OS computer running v5.18
Lobster <davidlobs...@hotmail.com> wrote:
> On 18/03/2013 18:05, John Rumm wrote:
> > On 18/03/2013 15:20, Lobster wrote:
> >> Right now I'm really confused - I don't know whether I should be looking
> >> at appliances (which!?) or wiring. I'd happily buy a new bloody oven if
> >> that would definitely solve it, but I am concerned it might not!
> >
> > You may be barking up the wrong tree.
> Hmm, I've just been advised there's been a bit of domestic confusion
> about what's causing the trip; apparently our temporarily resident
> daughter has been trying to switch to grill mode without realising[1],
> when using the oven which (a) may have damaged something and (b)
> accounts for some of the muddle. In the interim no more trips so
> hopefully it's the grill element. But need to investigate further when
> I have a bit of time.
> >> Problem's really made worse by being intermittent, and because it seems
> >> to involve appliances we really can't do without.
> >>
> >> Any advice on how to proceed most welcome!
> >
> > What test equipment do you have access to?
> Just an ordinary multimeter. And a lump hammer...
a multimeter almost certainly won't show leakage from the element of the
> On 18/03/2013 18:05, John Rumm wrote:
> > On 18/03/2013 15:20, Lobster wrote:
> >> Right now I'm really confused - I don't know whether I should be looking
> >> at appliances (which!?) or wiring. I'd happily buy a new bloody oven if
> >> that would definitely solve it, but I am concerned it might not!
> >
> > You may be barking up the wrong tree.
> Hmm, I've just been advised there's been a bit of domestic confusion
> about what's causing the trip; apparently our temporarily resident
> daughter has been trying to switch to grill mode without realising[1],
> when using the oven which (a) may have damaged something and (b)
> accounts for some of the muddle. In the interim no more trips so
> hopefully it's the grill element. But need to investigate further when
> I have a bit of time.
> >> Problem's really made worse by being intermittent, and because it seems
> >> to involve appliances we really can't do without.
> >>
> >> Any advice on how to proceed most welcome!
> >
> > What test equipment do you have access to?
> Just an ordinary multimeter. And a lump hammer...
grill. You will need a "megger" or PAT tester which uses at least 250v
--
From KT24
Using a RISC OS computer running v5.18
robgraham
Mar 19, 2013, 6:24:27 PM3/19/13
to
to Send it ---dohhh!
About a year or so ago a neighbour was having bother with his barn
lighting. It was an excuse for me to buy one of the Ebay ~£30
insulation testers. Inevitably in the time it took to arrive, the
problem was found and I've never found a further excuse to use it.
Has anyone had any experience of these - do they work - are they to be
relied on?
If there is a favourable answer, then that David, is your solution !!
Rob
Lobster
Mar 20, 2013, 6:40:47 AM3/20/13
to
On 19/03/2013 22:24, robgraham wrote:
> On Mar 18, 8:28 pm, meow2...@care2.com wrote:
>> On Monday, March 18, 2013 3:20:48 PM UTC, Lobster wrote:
>>> Am having a hell of a time with nuisance tripping at the moment. It
>>
>> You need to troubleshoot, or your efforts will mostly be in vain. I'd insulation test every appliance first.
> On Mar 18, 8:28 pm, meow2...@care2.com wrote:
>> On Monday, March 18, 2013 3:20:48 PM UTC, Lobster wrote:
>>> Am having a hell of a time with nuisance tripping at the moment. It
>>
>> You need to troubleshoot, or your efforts will mostly be in vain. I'd insulation test every appliance first.
> About a year or so ago a neighbour was having bother with his barn
> lighting. It was an excuse for me to buy one of the Ebay ~�30
> insulation testers. Inevitably in the time it took to arrive, the
> problem was found and I've never found a further excuse to use it.
> Has anyone had any experience of these - do they work - are they to be
> relied on?
This type of thing I presume?:
> lighting. It was an excuse for me to buy one of the Ebay ~�30
> insulation testers. Inevitably in the time it took to arrive, the
> problem was found and I've never found a further excuse to use it.
> Has anyone had any experience of these - do they work - are they to be
> relied on?
http://www.ebay.co.uk/itm/321021300857
I'm quite interested... (if only to keep in a cupboard as a guarantee of
no further occurrences, like you!)
Are they straightforward to use - are the basically like using a
multimeter on a very high-range resistance setting?
Pitfalls for the unwary, etc?
--
David
zaax
Mar 20, 2013, 10:57:50 AM3/20/13
to
On Monday, March 18, 2013 3:20:48 PM UTC, Lobster wrote:
> Am having a hell of a time with nuisance tripping at the moment. It happens intermittently, and when it does, you can just immediately flip the breaker back and it works again. So it's very hard to localise. It's definitely in the kitchen; and I'm fairly sure it happens when the oven's on; but seems it may be more likely when the microwave's on as well? When it does trip, it's the main RCD which goes; however sometimes an individual MCB flips as well. I hadn't particularly noticed which one, but I this morning I spotted that it was the main ringmain for all sockets in the house *other* than the kitchen! (the oven has a dedicated radial, and the kitchen sockets - including microwave - are on another MCB). First question - do the above observations add up at all? The MCB thing makes no sense to me at all; I wonder if today's observation was just a one-off oddity today? The first time this happened I thought (well, assumed, as I'd experienced this before) the problem was a duff element in the oven and just ordered a new one; when it arrived though (during which time there'd been no more trips) I checked the old and new with a multimeter, found identical resistance across terminals (20 ohms IIRC) and to earth (open circuit) and decided I'd been wrong, so returned the new element unused. Now wondering if I was incorrect in doing so. Could there be undetected earth leakage (which I don't have kit to detect? Could it be somewhere else in the oven? Or the house wiring? Oven is a built-in one about 10 years old; main element was replaced about 9 months ago. Right now I'm really confused - I don't know whether I should be looking at appliances (which!?) or wiring. I'd happily buy a new bloody oven if that would definitely solve it, but I am concerned it might not! Problem's really made worse by being intermittent, and because it seems to involve appliances we really can't do without. Any advice on how to proceed most welcome! -- David
How about one of the heaters. It sounds like that something is expanding (getting hot) then tripping the RCD, like a dry joint in a curcuit board
John Rumm
Mar 20, 2013, 12:06:45 PM3/20/13
to
On 19/03/2013 22:24, robgraham wrote:
ARW
Mar 20, 2013, 2:44:13 PM3/20/13
to
the tester when I am doing a 500V test:-)
--
Adam
Flowerpotgirl
Mar 20, 2013, 2:48:37 PM3/20/13
to
We had this problem with our light circuit, it kept randomly tripping but
then would sometimes go straight back on. It went on for weeks. We ended up
testing all the lights on the circuit but still could not isolate the fault.
Our friendly local electrician and his mate visited and were in the house
for four hours before they finally diagnosed the fault.....a mouse had
nibbled through one of the cables in the crawl space between the first and
second storey. There were burn marks around the nibbled area. Cable was
replaced and all is well now. This also happened to a friend, and her house
burnt down. We got off lightly.
"zaax" wrote in message
news:7f64c435-64e7-4337...@googlegroups.com...
then would sometimes go straight back on. It went on for weeks. We ended up
testing all the lights on the circuit but still could not isolate the fault.
Our friendly local electrician and his mate visited and were in the house
for four hours before they finally diagnosed the fault.....a mouse had
nibbled through one of the cables in the crawl space between the first and
second storey. There were burn marks around the nibbled area. Cable was
replaced and all is well now. This also happened to a friend, and her house
burnt down. We got off lightly.
"zaax" wrote in message
news:7f64c435-64e7-4337...@googlegroups.com...
Adam Funk
Mar 20, 2013, 5:06:17 PM3/20/13
to
On 2013-03-20, ARW wrote:
> Lobster wrote:
>> This type of thing I presume?:
>> http://www.ebay.co.uk/itm/321021300857
>>
>> I'm quite interested... (if only to keep in a cupboard as a guarantee
>> of no further occurrences, like you!)
>>
>> Are they straightforward to use - are the basically like using a
>> multimeter on a very high-range resistance setting?
>>
>> Pitfalls for the unwary, etc?
>
> Well I always get a new apprentice to hold the cables at the other end to
> the tester when I am doing a 500V test:-)
And the survivors go on to the next rite of passage?
http://oglaf.com/riteofpassage/
(NSFW cartoon)
> Lobster wrote:
>> This type of thing I presume?:
>> http://www.ebay.co.uk/itm/321021300857
>>
>> I'm quite interested... (if only to keep in a cupboard as a guarantee
>> of no further occurrences, like you!)
>>
>> Are they straightforward to use - are the basically like using a
>> multimeter on a very high-range resistance setting?
>>
>> Pitfalls for the unwary, etc?
>
> Well I always get a new apprentice to hold the cables at the other end to
> the tester when I am doing a 500V test:-)
http://oglaf.com/riteofpassage/
(NSFW cartoon)
ARW
Mar 20, 2013, 5:53:11 PM3/20/13
to
Although I nearly did today when he wiped the memory from a door entry
system that rendered all the working key fobs redundant.
--
Adam
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