Tripping issue with new installed 13 Way Dual Split Consumer Unit 2x100A RCDs (Type A) + 12 MCBs + SPD

[littlespark]

Was it on special price?
You might have been able to get a Proteus, Fusebox or Hager full RCBO board for not much more.

You will need to fill the gap at the end though. Is that a bell transformer?

 

[littlespark]

What makes you think he's not a pro ? Doing such a nice job.


I don't know what that's got to do with it.

The first pic showed Cu pre wired initially which was then altered I wouldn't call that a simple mistake,

It needed to be tested before being energised not after.

His profile says “electrical enthusiast/ unqualified hobbyist” So, no, he’s not a pro. With a name like Chippy Minton, he’s either a joiner or lives in Camberwick Green

Just an observation. Not all sparks that are cps members are competent… in my opinion…
It’s like the cps give membership on however much the fee is, and the evidence of 1 job per year… which could cover dozens of workers.

Unintentionally altered. Once disconnected, it wouldn’t be hard to mistakenly put it in the wrong bar.

True. Maybe I should have said “report done on the house”

 

[plugsandsparks]

Unlucky for a DIYer to pick up a CU, wrongly pre-wired. I think an electrician would have said "what the *uck" when they opened the box and saw how the neutrals were wired, clearly incoming and outgoing neutral leads to the say bar was never going to work, i would hope a pro would have spotted it as they were mounting it.
Generally i take all the guts out anyway to mount the enclosure, do all the knock outs etc, so a wrongly wired Cu from factory is neither here no there.

 

[DefyG]

Generally i take all the guts out anyway to mount the enclosure,

Same as

 

[littlespark]

Your last question on message #12 that I don’t think anyone else has responded to….
The 32A mcb next to the mainswitch is for the SPD. You’ll need to connect that back up, and not use it for the outbuilding.
It’s not there as a spare.

Depending on how it’s wired, the supply to the the outbuilding may need to be rcd protected.
The final circuits from the outbuilding WILL need to be rcd protected.

 

[brianmoooore]

Apart from anything else, with the link to the SPD in the 'out' side of the MCB, it would probably be physically impossible to get another cable of the required size into that terminal.

 

[DefyG]

Your last question on message #12 that I don’t think anyone else has responded to….
The 32A mcb next to the mainswitch is for the SPD. You’ll need to connect that back up, and not use it for the outbuilding.
It’s not there as a spare.

Depending on how it’s wired, the supply to the the outbuilding may need to be rcd protected.
The final circuits from the outbuilding WILL need to be rcd protected.

Agreed and it isnt shown on the Screwfix screenshot! which doesnt show a mcb between the MS and SPD so again something doesn't quite ring true!
There are also 2 (albeit MK) mcb's installed that do not look like the sit well and may therefore not be compatible with that actual CU?

 

[littlespark]

None of the screwfix pictures show an mcb for the SPD… so maybe it doesn’t need one??

My comment still stands for possibly needing rcd protection for outbuilding cable.

 

[Avo Mk8]

The 32A mcb next to the mainswitch is for the SPD. You’ll need to connect that back up, and not use it for the outbuilding.
It’s not there as a spare.

The H6820s Sentry dual SPD (and their single module version) has an internal fuse, and according to MK (though difficult to find the info) does not require additional MCB protection.
Just thought I'd mention for the OP's benefit.
Sorry - posted before I saw your amendment above!

 

[Chippyminton0]

Your last question on message #12 that I don’t think anyone else has responded to….
The 32A mcb next to the mainswitch is for the SPD. You’ll need to connect that back up, and not use it for the outbuilding.
It’s not there as a spare.

Depending on how it’s wired, the supply to the the outbuilding may need to be rcd protected.
The final circuits from the outbuilding WILL need to be rcd protected.

Hi little spark once again thankyou for your reply. The sdp doesnt have an mcb. There wasnt one connected to it and i checked on MK's website which says that type of SPD doesnt need one. I put the 32 amp mcb in between the spd and the main switch as there was enough slack to move the spd over a bit. I was hoping to leave it unprotected and conect it to the main switch with a busbar. I wanted to use it feed the garage . At the other end in the garage is a consumer unit with a main switch and a 32 amp 30ma bidirectional rcbo for protection. It was my understanding that having the garage supply running protected by a 32a 30ma rdc at the main consumer unit end and a 32a 30ma rcbo at the garage consumer unit would cause tripping issues.

(The bidirectional rbco is for a small solar invertor for a future project after the circuits have been tested by an electrician)

 

[Chippyminton0]

Was it on special price?
You might have been able to get a Proteus, Fusebox or Hager full RCBO board for not much more.

You will need to fill the gap at the end though. Is that a bell transformer?

I was being lazy/cautious maybe. I didn't want to extent the tails to the meter. The main switch on the MK was on the same side as the original which meant I could use the same tails. I bought a fuse board CU for the garage. It's seems like so much better quality than the MK. Ref to the RCBO board you are right. That is what I should have done

 

[Chippyminton0]

Was it on special price?
You might have been able to get a Proteus, Fusebox or Hager full RCBO board for not much more.

You will need to fill the gap at the end though. Is that a bell transformer?

Shelly 3em

 

[Chippyminton0]

Was it on special price?
You might have been able to get a Proteus, Fusebox or Hager full RCBO board for not much more.

You will need to fill the gap at the end though. Is that a bell transformer?

The gap filler was broken when I took it out on the box. I'm going to get one from screwfix today

 

[Chippyminton0]

Agreed and it isnt shown on the Screwfix screenshot! which doesnt show a mcb between the MS and SPD so again something doesn't quite ring true!
There are also 2 (albeit MK) mcb's installed that do not look like the sit well and may therefore not be compatible with that actual CU?

Well spotted, I was short 2 6 amp mcb's. I put two of the ones from the previous CU in it yesterday until I could get 2 new ones today.
When I got the cu there where two small pieces of plastic rattling around in the box. It turns out they where the clips for the back of the blanking cover for the gap at the end of the rcds. My guess is either MK really does have appalling QC or someone has had that box already and returned it back to screwfix.
Apparently that sdp doesn't need a mcb. I squeezed it between the main switch and SPD with the intension of supplying it from the main switch with a busbar and using it to supply the garage where it would be protected with a bidirectional rcbo.
Would that work or do you think I should take it out and forget about the idea?

 

[brianmoooore]

It is preferable that the supply to the garage isn't RCD protected, but that depends on whether the cable between the two is required by its type or installation method to be so protected. SWA doesn't need RCD protection, as long as the supply earthing isn't TT.