Discuss Totally stumped. Night Storage Heater tripping out MCB, but ok on daytime circuit. in the UK Electrical Forum area at ElectriciansForums.net
E7 MCB appears to be tripping a few hours into night storage heater charge. it is not overheating as it does not trip RCD on main board when wired to that.
See #36 and #38.
Is it a split board? If so, I don't doubt the simplicity.We don't know how they achieved the link from the 247 board to the heater ..........
That’s what I’m thinking. Older mcbs in your E7 are more sensitiveIt cant be the cables as they work fine when wired into the daytime supply. I will suggest that the guys to replace the E7 MCB unit's. my hunch is that because its an old E7 unit and the main unit is newer. The MCB's may have failed and are too sensitive and need upgrading, hence the heater not tripping the normal MCB when wired into that.
Thanks everyone who offered useful advice.
im thinking the way they have connected the booster+storage heaters into the 24hour supply and it now worksThat’s what I’m thinking. Older mcbs in your E7 are more sensitive
The impression I got was that they swapped things at the DBs. The OP doesn’t mention anything about boosters, not all E7 installations have that feature.im thinking the way they have connected the booster+storage heaters into the 24hour supply and it now works
i dont think they have taken the circuit from the e7 board and tried it on the 24h supply
rather they have taken the 24hour supply and put the storage heaters on that circuit outlet
thats all that i can gather/make sense of
most of the bigger heaters ive worked on had a booster featureThe impression I got was that they swapped things at the DBs. The OP doesn’t mention anything about boosters, not all E7 installations have that feature.
a new heater has been installed and also trips, but it only trips the E7, it is unclear if the link has been made at DB or at 24h/e7 outlet beside heaterany idea what the heater is pulling (amps)
that's in possibleThe OP has suggested that this storage heater ijn particular trips any of the E7 MCB's .............. so if its not the MCB, or the heater it has to be the cable and / or connections between the 2!
yes but it sounds like they have connected the faulty circuit into all the other mcbs and has tripped thosethat's in possible
if theirs a fault on any heaters it would only knock out that mcb .
a permanent temporary?Assuming all testing has been carried out effectively and shows no issues. Based on the info the OP has given I would suggest running a temporary new supply cable from the off peak board mcb to the new storage heater and see if it still trips. If it does it must be the heater, if it doesn't it must be the circuit cable.
a permanent temporary?
the replacing of the heater was a bit cart before the horseWe all know that the fault is probably quite simple, when found, at least. Until visiting site and having personal experience of the situation, I find some of the confident posts a little presumptuous. I don't tend to criticize other tradesmen without that personal involvement. Sorry if it upsets anyone but let's not presume we're talking about simple cockups (even if we are).
what a good idea Stanleyno a temporary temporary....it'll prove a point. Just chuck a bit of T/E round for a night or two and disconnect the circuit cable feeding the offending heater
Indeed....I spent 8 hours over 3 visits last week to trace what turned out to be an intermittent lighting fault.We all know that the fault is probably quite simple, when found, at least. Until visiting site and having personal experience of the situation, I find some of the confident posts a little presumptuous. I don't tend to criticize other tradesmen without that personal involvement. Sorry if it upsets anyone but let's not presume we're talking about simple cockups (even if we are).
Maybe these were two of the five electricians?what a good idea Stanley
is an intermittent lighting fault one that occurs only when switched on but fine if left off. ?Indeed....I spent 8 hours over 3 visits last week to trace what turned out to be an intermittent lighting fault.
As regards the heater, maybe.....but how do you know it's state, or whether previous tests were or were not carried out.the replacing of the heater was a bit cart before the horse
it should not take 5 visits to be in the same/worse situation than you started with
no a temporary temporary....it'll prove a point. Just chuck a bit of T/E round for a night or two and disconnect the circuit cable feeding the offending heater
is an intermittent lighting fault one that occurs only when switched on but fine if left off. ?
Would have been fine if the fence posts were taller!a farmer i know supplied one of his sheds with steel fence wire, over about a kilometer nailed directly to the top of fence posts
basically a 230v electric fence, cant remember what sort of animal was unfortunate enough to land on said fence but it blew the main fuse
i think it was a deer but may have been a cow, this is war story that was swapped so never seen it first handWould have been fine if the fence posts were taller!
I can believe it, it’s the sort of thing a farmer would do as opposed to spending money!i think it was a deer but may have been a cow, this is war story that was swapped so never seen it first hand
why should he shell out for insulated copper when he has an almost infinite supply of steel fence wire?I can believe it, it’s the sort of thing a farmer would do as opposed to spending money!
Haha! There’s a bloke at our place keeps horses (or used to when there was money in them!) He fitted some lights in a farmers barn......his payment?why should he shell out for insulated copper when he has an almost infinite supply of steel fence wire?
bloody farmers...
A classic!this post is now getting like one that flew over the cuckoos nest.
how can 5 sparks not work out were the fault lies .not very good is it .If they've been thorough and the heater checks out, the cabling etc. checks out and it doesn't trip on an MCB in the 24 hour board, really that leaves only one thing... the MCB in the E7 board. Change the one feeding the heater that causes the trips for a new one and see if that solves it.
but all e7 mcbs going at the same time would seem very unlikely, from what i gather they have tried putting the circuit into other mcbs in the e7 board and all have tripped with the troublesome heater/circuitCould it not be (as @Murdoch has also hinted) that it's simply a case of the MCBs in the E7 board are getting a little past it?
7 hours a day running near the limit for extended periods of time is going to have some effect on the bi-metal strip.
If they've been thorough and the heater checks out, the cabling etc. checks out and it doesn't trip on an MCB in the 24 hour board, really that leaves only one thing... the MCB in the E7 board. Change the one feeding the heater that causes the trips for a new one and see if that solves it.
Has this not been tried on the using the other MCB's in the E7 boardCould it not be (as @Murdoch has also hinted) that it's simply a case of the MCBs in the E7 board are getting a little past it?
7 hours a day running near the limit for extended periods of time is going to have some effect on the bi-metal strip.
If they've been thorough and the heater checks out, the cabling etc. checks out and it doesn't trip on an MCB in the 24 hour board, really that leaves only one thing... the MCB in the E7 board. Change the one feeding the heater that causes the trips for a new one and see if that solves it.
faulty fuse change !However, they have now wired it into the day time board and it is not tripping. Has anyone got any ideas as we need to get it wired back into the E7 circuit??
Just noticed...if they are 15amp breakers, the unit is getting on a bit. Are you sure they aren't 16 amp?Pretty sure its a 15amp MCB. The point is the particular heater trips any of the 15 MCB's on the E7 board they put it into (the other night storage heaters don't), but the heater does not trip any of the 15 amp MCB's on the main fuseboard when they wire it to that.
Just noticed...if they are 15amp breakers, the unit is getting on a bit. Are you sure they aren't 16 amp?
Bang on...(pun intended)...was a big old house, turned out to be a PIR buried under ivy and unknown to the householder, what it switched on was also unknown, but a L-E fault on the switched side led to a JB under the floor where the cable with the fault could be disconnected. Testing at the DB was clear, but every night at some point the mcb would pop when the PIR activated. A poxy job to trace that one.is an intermittent lighting fault one that occurs only when switched on but fine if left off. ?
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