MCBs tripping randomly?

[OnlQQker]

( it’s not a SWA it’s a wierd cable with loads of little cables as a neutral)

Got a pic of this cable Op?

 

[brianmoooore]

Don't recall the post quoted above, but that will be split concentric cable. The insulation on the individual neutrals in this cable is thin and fragile, making it more susceptible to neutral - earth faults than other cables.

 

[OnlQQker]

Don't recall the post quoted above, but that will be split concentric cable. The insulation on the individual neutrals in this cable is thin and fragile, making it more susceptible to neutral - earth faults than other cables.

Op's first post (page 1)

I will look up spilt concentric cable as never seen it before!

 

[OnlQQker]

I'm guessing it's this stuff but 6mm

25mm² Split Concentric Cable (Cut Length Sold By The Mtr)

Single-phase split concentric cable

www.cef.co.uk

So does that bundle of neutrals connect into the consumer unit? cuz on the pics the OP posted I couldn't see them?

 

[davesparks]

I'm guessing it's this stuff but 6mm

25mm² Split Concentric Cable (Cut Length Sold By The Mtr)

Single-phase split concentric cable

www.cef.co.uk

So does that bundle of neutrals connect into the consumer unit? cuz on the pics the OP posted I couldn't see them?

Yes that's the cable, if you look at the picture in post #94 you can see the bundle of neutrals connected into the Neutral bar and also another one in the top of the main switch.
Presumably this board is fed via a split-con submain.

 

[davesparks]

Don't recall the post quoted above, but that will be split concentric cable. The insulation on the individual neutrals in this cable is thin and fragile, making it more susceptible to neutral - earth faults than other cables.

Interesting, is it a particular brand of cable that you've had this problem with?

 

[brianmoooore]

Interesting, is it a particular brand of cable that you've had this problem with?

No particular brand. It's a characteristic of the cable - the insulation on the neutrals is thin and easily damaged, especially inside the CU.
I normally twist the neutrals tightly together and wrap the bunch with a few layers of PVC tape.