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An electrical/ELCB issue..
Comments
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Fightsback wrote: »
PS that's one hell of spike to trip a 32amp ring-main circuit breaker
The spike blows the varistor, the varistor shorts the mains and the short trips the MCB.
Varistors are supposed to short the mains to protect against transient voltages, but only for tiny fractions of a second. Only when they become faulty do they trip the MCB, depending on the type of MCB, a C or D type MCB probably wouldn't trip before the varistor was completely obliterated, but that would present a fire risk.“I may not agree with you, but I will defend to the death your right to make an a** of yourself.”
<><><><><><><><><<><><><><><><><><><><><><> Don't forget to like and subscribe \/ \/ \/0 -
Strider590 wrote: »The spike blows the varistor, the varistor shorts the mains and the short trips the MCB.
Varistors are supposed to short the mains to protect against transient voltages, but only for tiny fractions of a second. Only when they become faulty do they trip the MCB, depending on the type of MCB, a C or D type MCB probably wouldn't trip before the varistor was completely obliterated, but that would present a fire risk.
I'd expect the fuse to blow first, assuming quick blow. Interesting discussion.Science isn't exact, it's only confidence within limits.0 -
Well i have had a closer look at the CU is actually a Wylex and not an mk.
It looks like this one except that instead of a simple on/off incomer, it has a trip switch
The trip switch device looks like this and is built into the CU instead of the on/off switch.
On the label it says "current operated earth leakage circuit breaker" and is rated at 63A load/30ma trip.
I mentioned that this time as well as the main incomer flicking off,one of the mcb's flicked off.
On closer inspection i think it was one that is 15A at labelled water heater. This would be for the immersion which isnt used and is always turned off in the airing cupboard via what i assume is a DP switch.
I'm aware this could be an open wallet job so im trying to solve is at much as possible myself.
I have now popped the mcb for the water heater to take it totally offline and to see what happens.
I may have to wait months !Feudal Britain needs land reform. 70% of the land is "owned" by 1 % of the population and at least 50% is unregistered (inherited by landed gentry). Thats why your slave box costs so much..0 -
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Microwave ovens used to be good at popping RCDs, old style (long tube) fluorescent lamps are occasionally a nuisance - anything really that does not look like a resistive (heat) load. Only time I have had a 30 mA RCD pop is where a spider decided to sit between live/neutral in a ceiling rose.
Personally I'd be a bit nervous if the immersion was popping an RCD as that electrical item is connected to an awful lot of copper around the house. It is cheap enough to buy a replacement, even in a hard water area. The extra nervous might want to check the earth bonding, both at the consumer unit and in the bathroom.
Warning: this post may contain nuts or be entirely nuts and I am not a qualified sparkie.0 -
The extra nervous might want to check the earth bonding, both at the consumer unit and in the bathroom.
Warning: this post may contain nuts or be entirely nuts and I am not a qualified sparkie.
Funny you should say that, in my last house (old cottage) I discovered there was no earth whatsoever to the property while fitting a new shower.
:eek:Science isn't exact, it's only confidence within limits.0 -
C_Mababejive wrote: »
On the label it says "current operated earth leakage circuit breaker" and is rated at 63A load/30ma trip.
I'm assuming that ECLB isn't the actual one as it say 100ma which isn't for domestic and should be 30ma as far as I'm aware ?Science isn't exact, it's only confidence within limits.0
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