trouble with newly installed MK c/u

[jenions]

recently changed an old fuseboard to a new MK consumer unit with 2rcbo's and then RCD with 5 mcb's on it, now i IR all the circuits and all came out at <299Mohm but since day 1 the rcd has tripped whenever a high load is switched on? i tried the up and down ring and the fridge radial on 1 of the rcbo's (40A) and they worked fine but if i put them back on the rcd side they trip. anybody got any ideas? also the test button on the rcd isnt working, now this is the 2nd rcd ive tried as i changed the 1st 1 just incase that was faulty.

 

[ezzzekiel]

im sorry also Tony,

had a rcd that wouldnt trip, swapped for another exactly the same, swapped for the rcd in other bank which worked on one side but not the other.
removed all neutrals and it tested fine, replaced one at time until it stopped working when an old heating supply that had been fused down to supply an outside light caused the rcd not to trip and zs tests to fail, repaired the cable and then all tests came back fine.

But obviously I AM WRONG and as you say it was the rcd, next time ill leave it and tell customer the cu will only accept one rcd as all the rest in the world are broken................

and as a wise man once said and im inclined to agree with

I’m sorry but for professional electricians some of you should sign yourselves as “Hop-a-long Cassidy”. You condemn cowboys, but then give advice that is so off target it’s a wonder you’ve got two feet left!

 

[mickys86]

im sorry also Tony,

had a rcd that wouldnt trip, swapped for another exactly the same, swapped for the rcd in other bank which worked on one side but not the other.
removed all neutrals and it tested fine, replaced one at time until it stopped working when an old heating supply that had been fused down to supply an outside light caused the rcd not to trip and zs tests to fail, repaired the cable and then all tests came back fine.

But obviously I AM WRONG and as you say it was the rcd, next time ill leave it and tell customer the cu will only accept one rcd as all the rest in the world are broken................

and as a wise man once said and im inclined to agree with

Ok try that and if that don't work I'd go with the wiring beforehand haha

Maybe try the rcd connected with none of the mcb's connected? ( can't remember if this has been tried and am not re-reading all the posts again )

And as for the above..... Looks like a lot of us has learned something today

When removing all neutrals I'm guessing you mean with mcb's switched to off with the main breaker on?? Otherwise the neutrals would become live.
(just an apprentice and I like to be sure of these things!) hahaha 

 

[timo1]

RCBO's - They are the future!!! I got so fed up with RCD's and shoddy quality I only fit new boards decked out with RCBO's now, cost has come down so much its not all that much extra IMHO.

 

[topquark]

Well I'm not sorry ... well apart from the heath robinson explaination of the test circuit

 

[Knobhead]

Please supply a better drawing.

William Heath Robinson was a fantasic guy, using his methods I’ve got umpteen industrial plants going. What’s wrong with a brush stale holding a circuit breaker closed?

 

[nickblake]

Just to make i clear Tony when i replied i was in no way having a go . it was just a scinario that i have come across , and the reason i mentioned the outside lights , electricity can do wird things and with the addition of RCD make the whole job more intresting

 

[JamesBrownLive]

RCBO's - They are the future!!! I got so fed up with RCD's and shoddy quality I only fit new boards decked out with RCBO's now, cost has come down so much its not all that much extra IMHO.

But don't you need an RCBO for each circuit, as opposed to having a single RCD that covered a few? Or can you get RCBOs that can cover more than one circuit?

Cheers

 

[ezzzekiel]

Just to make i clear Tony when i replied i was in no way having a go . it was just a scinario that i have come across , and the reason i mentioned the outside lights , electricity can do wird things and with the addition of RCD make the whole job more intresting

cant see why not

this is one of the worst statements ive ever read lol

For gods sake it’s not difficult if the RCD fails to trip on test, the faults in the RCD.

 

[topquark]

But don't you need an RCBO for each circuit, as opposed to having a single RCD that covered a few? Or can you get RCBOs that can cover more than one circuit?

Cheers

You can, as with MCBs, put more than one circuit into an RCBO but it's not good practice. There's nothing wrong with mixing RCBO's, MCB's and an RCD(s) in a consumer unit if you want to achieve that (and have the necessary module space).

 

[jenions]

i know the wirings messy inside, but ive got no slack on any cables to try neaten it up so its the best i can get it. still havent got job sorted only just got access to property again

 

[Guest123]

I can spot one fault straight away, probably what is causing the tripping problem too.

 

[Richard Burns]

yes even though the picture is a bit out of focus, interesting extra bit of copper there?

 

[ipf]

I can spot one fault straight away, probably what is causing the tripping problem too.

Without the insulation?

 

[Nolnoc]

Is the neutral blocks linked out.??????? Hard to make it out properly

When Tony sees this I reckon there might be a bit of a -------ing lol

 

[jenions]

thats the way it came :/ never used an mk board before

 

[ipf]

What's MK got to do with it?

 

[GLENNSPARK]

Definetly looks like some sort of shunt between neutral bars.....

 

[vernam616]

thats the way it came :/ never used an mk board before

Are you being serious?

yet again im shocked to what basic knowledge an electrician has, very worrying some of the posts you come across on this forum

Id identified that problem within 5 seconds of opening the photo, more than likely because im time-served, and im pretty sure others identified it too

 

[telectrix]

me too. the main switchy is on gthe wrong side of the board. :hurray:

 

[polo1]

C'mon lads, put the man out of his misery:svengo: