Trips the current.

[johnpaul]

I have two 1200w Mini Cookers which trips the current. If I use a 2500w kettle, it is OK. If I use a 2000w fan heater it is OK. I cannot see any faults with the cookers and cannot get my head round what is happening. Any help appreciated?

 

[Dustydazzler]

When you say ‘the current’ do you actually mean the rcd ?

could be a leaky element

 

[johnpaul]

Yes RCD

 

[James]

Most likely issue is a fault with each of the cookers.
The rcd is doing its job correctly by turning the power off when it detects a fault.

 

[johnpaul]

Thanks. That is my deduction.

 

[telectrix]

if the mini cookers have been out of use for a while, there could be damp in the elements. one way to dry them out is to plug into a socket that doesn't have RCD protection and run them for a while.

 

[littlespark]

An RCD doesn’t give overload protection, so adding up the wattage doesn’t give any clues.

it may be a faulty element, or faulty connection within either appliance.

Do the work ok separately?

Is it one rcd for a number of circuits? (Cumulative?)

 

[Lister1987]

Fault with the element would be my guess. A PAT test (yes yes I know) would reveal the fault.

RCD trips due to current in L and N not being equal (leaking to earth). Of the appliance however tests fine then you're looking at something else but my money is the appliances, elements specifically.

Thought I posted this last night ?

 

[johnpaul]

An RCD doesn’t give overload protection, so adding up the wattage doesn’t give any clues.

it may be a faulty element, or faulty connection within either appliance.

Do the work ok separately?

Is it one rcd for a number of circuits? (Cumulative?)

Yes one RCD for all circuits.

 

[johnpaul]

I bought a new oven and all is OK, but have no idea what is wrong with the old one.
Is there any way to check?

 

[Mike Johnson]

Yes do an insulation resistance test.