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.

 

[vernam616]

Well if page 6 of this thread isnt enough of a clue, i reckon he should see if he can get a job collecting bins or cleaning windows maybe, even then that still requires some degree of common sense

Just realised the original date this thread started 22-8-11, certainly glad i wasnt your customer, how incompetant must it look leaving someones property in a state of fault for well over one month, i can only presume RCD has been linked out to overcome your problem

 

[Engineer54]

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

How can the main switchy go on the other side of the board, the L-N poles wouldn't allow you to do that....

 

[Richard Burns]

Jenions the neutral link is present in the board so that you can put more circuits on one side of the CU and use the third unlinked neutral for another RCD. Because of the circuits design you have, you only need two circuits on the first neutral bar so there is no need to use the link. If the link is left in the current in the neutral can bypass the RCD so it sees a difference in current between line and neutral current and trips. Remove the copper link and this should solve the problem.

 

[sparkinlee]

Remove the copper link and this should solve the problem.

I'd be interested to know if this also solves the problem mentioned in the OP that the test button on hte RCD is not working.

 

[ipf]

How can the main switchy go on the other side of the board, the L-N poles wouldn't allow you to do that....

Turn it upsidedowny

 

[Engineer54]

Then i suggest, the main isolator is in the correct position as shown in the photo.

 

[Knobhead]

It’s nice bright and shiny.

I’ve saved that picture

 

[polo1]

A picture is worth a thousand words..... (even a very small picture!!!!)

 

[vernam616]

A picture is worth a thousand words..... (even a very small picture!!!!)
View attachment 8089

You do realise if you hover over/click photo it will enlarge it in a seperate screen:20:

 

[peanutty]

blimey, basic.

 

[polo1]

Ver...,ever heard of irony?

 

[vernam616]

Ver...,ever heard of irony?

Your post insinuated that you could only see the small picture in the OPs picture post

Apologies for not appreciating your sarcasm

 

[telectrix]

Then i suggest, the main isolator is in the correct position as shown in the photo.[/QUOTEi looked at it again through a mirror. all correct now. LOL.

 

[telectrix]

it'a a bad layout anyway, as he has only 4 N terminals for the 5 RCD circuits.

 

[Des 56]

it'a a bad layout anyway, as he has only 4 N terminals for the 5 RCD circuits.

I'd say that was because it would originally be a 4x4 split load board and he has been playing around with that set up

I am not reading the whole thread, but that appears to be the reason where the glaringly obvious problem he has had originated from

He must also have ( knowingly) extended the bus bar to make that set up

 

[topquark]

How can the main switchy go on the other side of the board, the L-N poles wouldn't allow you to do that....

Yep, absolute pain with MK boards!

 

[topquark]

Jenions the neutral link is present in the board so that you can put more circuits on one side of the CU and use the third unlinked neutral for another RCD. Because of the circuits design you have, you only need two circuits on the first neutral bar so there is no need to use the link. If the link is left in the current in the neutral can bypass the RCD so it sees a difference in current between line and neutral current and trips. Remove the copper link and this should solve the problem.

Well that's given the game away

 

[Knobhead]

He could use the link. There’s a neutral bar sat there doing nothing! The neutrals could be spread out to tally with the MCB’s then. And as for the 2[SUP]nd[/SUP] MCB from the RCD what’s coming out of that?

 

[topquark]

Gonna have to go and look at the piccy again now

 

[topquark]

Ah, that's just an RFC with a spur taken at the CU Tony, either that or whoever installed it was fresh out of MCBs