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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Anyway of "damping" an MK Sentry circuit so cooker doesn't cut it out all the time?
Electric cooker, sealed element (ceramic hob, not the ring element) only 7
years old. Recently, if there is the slightest bit of moisture it trips the RCB and the whole house goes out. The wiring is a little scorched, but still looks sound, but sometimes it also happens as the ring is turned OFF, which is odd. Can't find any shorts or The cooker fuse is MK LN5930 - I think this is the closest spec sheet. http://www.tlc-direct.co.uk/Technica...entry/RCDs.pdf I can't find any mini rcb to replace the fuse, so the cooker doesn't black the whole house out. Meantime, is there some way I can "damp" that circuit, so it's a little less sensitive? |
#2
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Is this some sort of GFCI breaker? Sounds like the cooker is finding another
path to ground. There is not any way to damp this you should either find the fault or you could replace the GFCI breaker with a norman one. Probably not a good idea since you say wires are scorched though. GFCI breakers monitor the current going out on the hot wire and current returning on the neutral. They are designed to shut off when the current supplied is not returning on the neutral and is returning to ground somewhere else. Exactly what kind of cooker is this? I can't find any mini rcb to replace the fuse, so the cooker doesn't black the whole house out. What is a mini rbc? - Mike "Jonathan" wrote in message ... Electric cooker, sealed element (ceramic hob, not the ring element) only 7 years old. Recently, if there is the slightest bit of moisture it trips the RCB and the whole house goes out. The wiring is a little scorched, but still looks sound, but sometimes it also happens as the ring is turned OFF, which is odd. Can't find any shorts or The cooker fuse is MK LN5930 - I think this is the closest spec sheet. http://www.tlc-direct.co.uk/Technica...entry/RCDs.pdf I can't find any mini rcb to replace the fuse, so the cooker doesn't black the whole house out. Meantime, is there some way I can "damp" that circuit, so it's a little less sensitive? |
#3
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On Fri, 7 Oct 2005 15:52:32 -0400, "Michael Kennedy"
scrawled: Is this some sort of GFCI breaker? Sounds like the cooker is finding another path to ground. There is not any way to damp this you should either find the fault or you could replace the GFCI breaker with a norman one. Probably not a good idea since you say wires are scorched though. GFCI breakers monitor the current going out on the hot wire and current returning on the neutral. They are designed to shut off when the current supplied is not returning on the neutral and is returning to ground somewhere else. Hmm, mainly pointless for uk.d-i-y. Exactly what kind of cooker is this? I would assume a UK one. -- Stuart @ SJW Electrical Please Reply to group |
#4
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On Fri, 7 Oct 2005 20:07:54 +0100, "Jonathan"
scrawled: Electric cooker, sealed element (ceramic hob, not the ring element) only 7 years old. Recently, if there is the slightest bit of moisture it trips the RCB and the whole house goes out. That would be RCD then. The wiring is a little scorched, but still looks sound, but sometimes it also happens as the ring is turned OFF, which is odd. Can't find any shorts or Doesn't have to be shorted, although I don't like the sound of "a little scorched". How do you know it's sound, what did you test it with. The cooker fuse is MK LN5930 - I think this is the closest spec sheet. http://www.tlc-direct.co.uk/Technica...entry/RCDs.pdf Fuse, or MCB, or RCD, or both, or all three? I can't find any mini rcb to replace the fuse, so the cooker doesn't black the whole house out. Probably because RCB is a made up TLA. Meantime, is there some way I can "damp" that circuit, so it's a little less sensitive? Possibly, but I think you'be better calling someone in who understands electrics a little more clearly. -- Stuart @ SJW Electrical Please Reply to group |
#5
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On Fri, 7 Oct 2005 20:07:54 +0100, "Jonathan"
wrote: Meantime, is there some way I can "damp" that circuit, so it's a little less sensitive? You could replace the RCD - some do get a little "twitchy" with age. Best approach though is to split-load the consumer unit. Some circuits (sockets, shower) are RCD'ed, others (lighting, freezer, cooker, immersion, welders, multi-hp machine tools, pottery kiln) aren't. |
#6
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Andy Dingley writes:
On Fri, 7 Oct 2005 20:07:54 +0100, "Jonathan" wrote: Meantime, is there some way I can "damp" that circuit, so it's a little less sensitive? You could replace the RCD - some do get a little "twitchy" with age. Best approach though is to split-load the consumer unit. Some circuits (sockets, shower) are RCD'ed, others (lighting, freezer, cooker, immersion, welders, multi-hp machine tools, pottery kiln) aren't. If only this one device is causing problem, you should replace it or have it professionally repaired. Otherwise, you're putting a bandage on a cancer. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#7
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Sam Goldwasser wrote:
Andy Dingley writes: On Fri, 7 Oct 2005 20:07:54 +0100, "Jonathan" wrote: Meantime, is there some way I can "damp" that circuit, so it's a little less sensitive? no If only this one device is causing problem, you should replace it or have it professionally repaired. Otherwise, you're putting a bandage on a cancer. Not really, a fixed appliance with a bit of leakage on a non-TT system is a non risk. And leakage on cooker elements is normal. 1. Is your installation TT? 2. If not, replace the CU with a split circuit one, with the cooker not on an RCD. 3. There isnt anything you can do to the cooker to make it work more reliably, other than bypassing the neutral switching on the user controls if its 2 pole switched. Since it pops when switched off this may be what youve got, and keeping N connected will normally prevent that. However as others have said, I would not suggest you personally rush into the work, not until youre a fair bit clearer about this. If its jsut one specific ring that does it, you could replace that one. But you shouldnt need to, its just a badly designed insall. Whole house RCDs are deprecated now - after being compulsory before of course. (This excludes TT systems, which have ane extra issue requiring whole house RCD cover - but that is now implemented rather better than previously) NT |
#8
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Anyway of "damping" an MK Sentry circuit so cooker doesn't cut it out all the time?
On 07 Oct 2005 18:33:40 -0400, Sam Goldwasser
wrote: If only this one device is causing problem, you should replace it or have it professionally repaired. Big electric heating elements are always going to have high leakage currents. |
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