Problem with split load CU

[DaveVector]

Hi Folks, I've had a strange and frustrating day today. Installed an MK split load Consumer unit to replace two rewireable fuse boards.
Earth system is TT 14.5 ohms PFC is 1.86 M ohms I've split the load over two 63A 30mA RCd's as follows (left to right from main switch):

1. Oven, Downstairs sockets, Spur sockets, Lights (they are all on one circuit!)
2. Shower, Kitchen sockets,Upstairs sockets, Spur sockets

Now here's the headache:banghead:...all circuits have been tested individually and, apart from a slightly low IR reading on the upstairs sockets (174M ohms), they all check out fine. But when everything is wired in and energised, using the microwave on the kitchen sockets or the upstairs sockets (all side'2') trips the RCD on the other side ('1') and sometimes side '2' !!
So I double checked that I had wired the board up correctly( no neutrals put to wrong neutral bar, RCD's wired as per manufactures instructions, no rings crossed...). Then tried just having the kitchen sockets on one side with the oven or the downstairs sockets or the spur sockets on their own. Still the wrong RCD trips!!
Ditto using upstairs sockets only.
Ditto using spur sockets on side 2
So then I took the lighting circuit out of the puzzle. Same result.

The only area I am uncertain of, is the cable from the main cut out. This runs as a single cable from the top of cut out to the meter. I presume this is in fact two-in-one which seperrate at the meter?

So can anybody shed some light please, before I spend another 3 hours scratching my head and cursing!!

 

[Des 56]

We don't see them much,if ever, in Wales
I suppose they don't fancy living in squaller and they must be scared in case they get robbed :rockon2:

 

[sedgy34]

You have a cross connection there mate probably under the floor somewhere

 

[tidyboiler]

I'd better not tell her that !!! :38:

Too late................ spotted. :smilewinkgrin:

 

[DaveVector]

Just to update on this post....
:clap: I found it.
After 4 hours of taking it apart and putting back together again, I located a socket hidden behind a radiator!
After removing the rad and getting into the socket it turns out that one of the screws had cut through the neutral insulation, causing the connection across the split load via the earth bar.
Whoever thought it was a good idea to mount a radiator over the socket without sorting it out first should have their head examined!!!!
Oh! that would be a plumber......or should us Sparkys call them Drippys?:thinking2:

 

[Guitarist]

Just to update on this post....
:clap: I found it.
After 4 hours of taking it apart and putting back together again, I located a socket hidden behind a radiator!
After removing the rad and getting into the socket it turns out that one of the screws had cut through the neutral insulation, causing the connection across the split load via the earth bar.
Whoever thought it was a good idea to mount a radiator over the socket without sorting it out first should have their head examined!!!!
Oh! that would be a plumber......or should us Sparkys call them Drippys?:thinking2:

Well done. There's a world of jobs just like that one waiting for you.....