RCD Tripping when two MCBs are on (Upstairs & Downstairs sockets)

[Lawrence Lee]

First time post...

The RCD trips when both the upstairs sockets/kitchen MCB & the downstairs sockets are on.
When they are on the RCD will not turn on.
It happened a few weeks again but switched back on fine the has been happening more and more frequently until today when it wont switch on at all.

The main board is on a fine... this is a separate RCD with 3 MCBS (Cooker, Sockets, Sockets/kitchen)

Any help would be greatly appreciated!!!

 

[terryplumb]

Show us pictures of this RCD with 3 MCB's.

 

[JohnD]

Also, unplug (not just switch off) every portable appliance. Every fixed appliance, turn off at the wall isolator. Does the RCD still trip?

Now, one at a time, turn on
-the cooker and oven
-the immersion heater
-the boiler
-the outside lighting and socket
-the dishwasher
-the washing machine
-the kettle
-the PC
-the coffeemaker
-the tea urn
-the microwave
-the fishtank
-the fountain
-the jacuzzi
-the shed supply
-the hot tub.

Do any of these cause a trip?

 

[Lawrence Lee]

I've taken all the plugs out of sockets & turned off the appliances via switches

 

[Lawrence Lee]

Ive unplugged everything and the RCD won't switch on with the two socket circuits on

 

[Lawrence Lee]

I'll upload the photo now.. give me 1 minute

 

[Lawrence Lee]

The RCD will switch on with the cooker MCB on but not the other two

 

[Lawrence Lee]

 

[Lawrence Lee]

I had the cooker circuit on but even that just trips the RCD after a minute or two now... not the MCB aren't tripping

 

[Lawrence Lee]

I've got a sparky friend on his way... no need to reply