mcb tripping

[mapj1]

Simply narrow down the fault to a small enough group of parts rthat you can stand the cost or replacement, and replace. Further diagnostics is uneconomic.
Were these '2 radials' once a ring and it got cut when something was nailed through it??
- a ring of 2.5mm on 32A breaker is fine, as everything is fed with half the current from each side, but a radial of 2.5mm is only really good for a bit over half of it - would it be better to keep the 32A MCB, and make it a single ring?

 

[nabby68]

no mapj1. this would be a nightmare to try and join the radials up and make a ring. thanks for the suggestion though. i think i will stick with two radials on 20 amp breakers

 

[nabby68]

and to andrew,

i meant rccb, if that makes sense?

 

[andy]

and to andrew,

i meant rccb, if that makes sense?

rcd an rccb are pretty much the same things, just different names