New oven tripping - now with pictures

[Spark123]

I was thinking that too, but I am counting too many big blue wires in the right hand bar - there should be one from the main switch (far right N) and one going to the top of the RCD, but there's three there.
It is as if it was a high integrity board and it got butchered (badly).
I'm just wondering if there is not enough loading on the lights to trip the RCD as they are in the left hand neutral bar too.

 

[EFLImpudence]

A lot of IFs, so I may be wrong - but

If the Oven N is the cable marked AND
the blue tails marked with ? are the same cable (or it may be the other one), then
the right hand side of the blue tail should be in the neutral bar to the left (middle one).

Also there is only one other wire in Oven N neutral bar, so if you can find out what that supplies then it too should trip the RCD - if I am correct.

 

[Taylortwocities]

I would liketo see a pic with the busbar cover removed (turn off main switch before doing this, John).

From what i can see it has been done as a split load configuration. Counting from the RCD, MCBs 1 through 5 are on the RCD (up to the B6 which is off). The rest are not RCD protected.
If this is a recent install, it does not meet the wiring regulations as all circuits should be RCD protected (I'm assuming standard domestic install with buried cables <50mm deep).
There should be TWO RCDs in that box!

The whole thing is a complete horlicks, and I agree with Spark123, it smells of mixed up neutrals. He hasn't followed the terminal marker numbering, for some reason too.

Whoever did this is supposed to be a member of a Competent Person Scheme. Look up his details and report him to whoever he is registered with.

 

[EFLImpudence]

Oh. I see now there may be more Ns in the left bar but same difference if not used.

 

[Spark123]

I think the big blue wire which feeds the RCD in that board may be smaller than the one between the right hand neutral rail and the main switch so piggybacking middle to left bar may not be a wise decision.

 

[Spark123]

Whoever did this is supposed to be a member of a Competent Person Scheme. Look up his details and report him to whoever he is registered with.

There is another thread about the [electrician] here: //www.diynot.com/diy/threads/main-power-switch-tripping.461987/

It appears he claimed to be a member of some schemes but he wasn't

 

[Taylortwocities]

I want to see the busbar, and see if it is split, or in one piece!
If it is split, I wonder how it gets its line, probably from the bottom of the main switch?



If it is split then (as EFLI's pic) the tri-rated neutrals in the 'raw' (right hand) neutral busbar will be (from the right)
Neutral in, from main switch
Neutral out to RCD in
Neutral out to left hand (N2) busbar

 

[Spark123]

His lights trip with the RCD so I'd say the busbar will be in one piece up just before the left hand 16A MCB (boiler). This is somehow fed separately with the neutral for it being the black wire in the right hand neutral bar.

 

[Taylortwocities]

There is another thread about the [electrician] here: //www.diynot.com/diy/threads/main-power-switch-tripping.461987/

Ahh

Its becoming clear. @Johnmcb Did it not occur to you that the problem is with how your so called electrician has smangled that consumer unit. There is no problem with the oven (or the grinder).
You have had an offer from skenk to come and help sort you out, did you not take him up on that?
Have you reported the cowboy to NAPIT?

It would have helped if you had added this incident on to the previous thread, then we would have had the full enchilada.

 

[Johnmcb]

His lights trip with the RCD so I'd say the busbar will be in one piece up just before the left hand 16A MCB (boiler). This is somehow fed separately with the neutral for it being the black wire in the right hand neutral bar.

Your 100% correct. There's a live wire going along the bottom underneath the plastic to boiler MCB.

It was to late to get anyone else he had been already

I have reported him to NAPIT and they are pursuing legal action.

Looks like I need to get a competent spark out to redo it now. Hard bit is finding one after my recent experience.

Thanks for all the replies guys, it's good to know there's some decent people out there.

Cheers, J

 

[securespark]

His lights trip with the RCD so I'd say the busbar will be in one piece up just before the left hand 16A MCB (boiler). This is somehow fed separately with the neutral for it being the black wire in the right hand neutral bar.

That's what I suggested!! Not that I'm being competitive (get outside now, we can sort it out in the car park!!)

 

[Johnmcb]

Oh. I see now there may be more Ns in the left bar but same difference if not used.

Correct - i think these are for a dissused alarm system I'll try disconnect them tonight. Or should I move the oven to the other N bar?

 

[EFLImpudence]

Correct - i think these are for a dissused alarm system I'll try disconnect them tonight.

If not used then you could leave them there.

Or should I move the oven to the other N bar?

You could do that -

OR

If you feel comfortable doing it, all that needs to be done is:

That is - connect the left N bar to the middle N bar instead of the right N bar.
That is the only fault.

 

[Jackrae]

But doesn't it beg the question why hasn't other circuits on the left neutral bar previously caused tripping of the RCB due to neutral imbalance

 

[Johnmcb]

But doesn't it beg the question why hasn't other circuits on the left neutral bar previously caused tripping of the RCB due to neutral imbalance

It does - but I think (and i've just recently moved in) these are to do with a legacy alarm system that isn't powered on and I've never seen it on!