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!!

 

[DurhamSparky]

thats got me thinking now!!! RCBO for MCB...!!! hmmmm!

 

[trev]

Or as I was told by the last company I worked for... "We don't have any problems in this Company...only opportunities to learn"

A company I worked for had the old NASA quote plastered all over the office "Failure is not an option"
I almost puked.

 

[Des 56]

looking at the thread title, it's so negative. there are no problems, only solutions

Yes,I have to agree
The title makes it seem like the CU has been a naughty board,it wont listen,probably one of those imported ones,they are nothing but trouble,lock em all up I say :26:

 

[ipf]

I wonder if you could find out who it was and change their wheels for bricks....

What.... and smack 'em on th'ead with a tyre ?

 

[telectrix]

had that done to me. working near a pikey site. wheels gone van on bricks. best of it was, though, the bricks were worth more than the wheels and bald tyres.

 

[telectrix]

Yes,I have to agree
The title makes it seem like the CU has been a naughty board,it wont listen,probably one of those imported ones,they are nothing but trouble,lock em all up I say :26:

obviously the CU is named brian. " brian's been a naughty boy, he's not coming out to play "

 

[ipf]

hahahah thats shocking!!! i hope you told customer to ring police..!!!

mid you it probably was police trading as electricians!!

Should have got the girls in, eh?

 

[Geordie Spark]

had that done to me. working near a pikey site. wheels gone van on bricks. best of it was, though, the bricks were worth more than the wheels and bald tyres.

A pikey site has appeared near to where Wor Lass lives.


As we drove past the other night, she got all excited at the sight of the caravans & the pikeys sitting round the camp fires burning the insulation off lengths of cable & wanted to go & ask if anyone knew her Granddad !!! :dizzy2:

 

[ipf]

A company I worked for had the old NASA quote plastered all over the office "Failure is not an option"
I almost puked.

The norm for idiot pat testers
and £40 EICR doers

 

[DurhamSparky]

if you ever pass peterlee at the minute its full of vans/horses/caravans and thieving scum!! right on corn of industrial estate about 200 of them!

 

[trev]

That rough area is always full of em mate, the kids still have mullets for crying out loud

 

[Silly Sausage]

re Thread title,

at least he didn't write 'Issues with split load CU'

That word really annoys me!

 

[Geordie Spark]

if you ever pass peterlee at the minute its full of vans/horses/caravans and thieving scum!! right on corn of industrial estate about 200 of them!

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

 

[DurhamSparky]

i tell a lie.... they are also sprawled in to shotton colliery as wel....!!

 

[trev]

i tell a lie.... they are also sprawled in to shotton colliery as wel....!!

And Houghton Le Spring