Electrics in kitchen cut out if I use more than 3 appliances

[bernardgreen]

If absolutely everything is disconnected with Live and Neutral disconnected and then switching the electric fire on causes the RCD to trip then the fault is 99% sure to be a Neutral to Earh fault in the wiring. As mentioned switching off an MCB does NOT isolate the Neutral on that circuit.

One fault often over looked is a damaged or saturated outside light with a Neutral - Earth fault.

It would be quicker to get an electrician to do the insulation tests

 

[sparkwright]

I would say it was a waste of time and effort pulling all those large appliances out to unplug them when presumably there are double pole switches that would have isolated each appliance sufficiently to eliminate where the fault may be.

Still never mind.

 

[boilerfrustration]

Just reporting back that I brought in an electrician who confirmed that there was an earth fault with the underfloor heating which he disconnected at the consumer unit. I can now use as many appliances as I want without fear of tripping. Thanks to everyone in this thead for helping me to help the electrician narrow down the problem.