rcd keeps tripping

[robert0881]

OK here goes i will try explain a fault im having with my consumer unit. Ive just bought a house and moved in but the rcd keeps tripping when there is too much load on,
basicly if i have the following switched on. tv/sky/2kw heater/tumble dryer/fridge freezer/chest freeser/water heater/cooker and some lights
if all of these are on at once the 80amp rcd will trip.
if i then turn off the water heater and the cooker things are ok.
if i then put on the kettle the rcd trips again. if i leave kettle off and turn dryer on it trips too.

The individual trip switches arnt tripping just the main 80amp rcd thats going.

It seems to me that if there is too much load going through the consumer unit and its tripping.
doesnt look like one thing thats putting it off. Ive tried different combinations with same results.
that shouldnt be too much load on the consumer unit to trip it?
right now i have tv/2kw heater on/fridge freezer and chest freezer on. if i turn on the water heater it trips. if i dont turn on water heater and turn tumble dryer on it trips too.
help lol?

 

[diditrain]

Do you know when the property was last inspected, tested and certificated?
Might be time to have an EICR carried out

 

[Deleted member 9648]

There is likely to be a low insulation resistance somewhere,rather than an overload. First step with any RCD tripping problem is to carry out a LN-E IR test and eliminate any issues there before looking for other causes.....I would suspect either the cooker or water heater are likely candidates to show a low IR.

 

[Knobhead]

Low IR on any one circuit may be below the threshold to trip the RCD so it holds. Once more than one circuit is live the sum total of the leakage may be above the threshold.
You need to find the lowest IR’s and work your way through them. Or get the lot tested, not everything lasts fore ever.

 

[Farmelectrics]

i agree do a full test on all circuts cause will be a low ir reading cant see it being an overload problem

 

[Octopus]

Do you have any test kit? I'd ramp test the RCD and then do IR tests.

 

[ringer]

What everyone is saying is that it is not an overload, but an accumulation of earth leakage that is causing the rcd to trip. Rcds do not detect overload, that function is done by the individual mcbs on each circuit. To get to the bottom of the problem you need to have tests done with specialised test equipment. Any decent electrian should have this test equipment. You need to get an electrician in.