Split load RCD tripping

[rmac]

Hi guys,

a little help if you could?

My parents have an old prefab outbuilding at the back of there property. water/condensation has gotten into the olf fuse box and blew 2 fuse carriers apart deeming it unuseable. I changed the box for a new split load box with a 100A main switch and 2 RCDs. Now i have connected it all back up there is some funny goings on which i cannot explain. I have one rcd protecting 3 6a & 2 16a MCBs and the other rcd is protecting 4 32a & 1 40a MCB. The problem i have is when i have all the power on and i plug a kettle or small blow heater into any of the sockets no circuits trip but the rcd suppling the 6 & 16a mcbs trips. I have checked all the wiring and my neutrals are within the correct N bar for that rcd. The funny thing is when i plug a lamp into the sockets that is fine everything still works.

Do you really require 2 RCDs or could i take 1 out and just protect the sockets?

Very long post guys sorry but im at a brick wall

Any help would be greatly appreciated.

 

[ban-all-sheds]

Did your continuity & EFLI tests indicate that there might be anything odd with the any of the circuits?

What were your IR measurements for each circuit, and RCD test results?

 

[rmac]

hi ban, the installation has not been tested. technically i am an electrician but only on paper. i completed my college course and my fica test through my engineering apprenticeship so i dont do a great deal of electrical work as it shows. Generally if i do any installation work i then pay a company to come out and Insp & test the work but as it was for my parents i have not done so. I guess this would be the way forward on this one. If for example you had an rcd protected ring main which was constantly tripping due to a heating element how would you normally go about this as it would wold not meet standard to disconnect the rcd?

 

[ban-all-sheds]

hi ban, the installation has not been tested.

Ah.

technically i am an electrician but only on paper.

Even on paper you should have known better.

I guess this would be the way forward on this one.

Yup.

If for example you had an rcd protected ring main which was constantly tripping due to a heating element how would you normally go about this as it would wold not meet standard to disconnect the rcd?

Replace the dodgy heating element.

 

[rmac]

ah well i guess i shall consult my tester!!!