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Switch everything off including the main RCD and MCB unplug anything you can then try to close the RCD first then the MCB's then switch on any fixed appliances fridge,water heater etc one at a time till you find which one is tripping the main switches,main suspect would be the water heater.

Saxo1

hi jeff thanks for the reply yes there is such switch so do i set switch to off position and then will it be totally off the mains?

are you on a site or are you plugged in at home.

the switches that are tripping, are they tripping in the house or in the van?

first start with just the hookup lead plugged in at the supply, but not at the van.

if tht stays on, do as saxo says, unplug everything 240v in the van switch off the water heater, fridge etc, switch off the incomming switch to the van.

then plug back in the huckup lead, and work your way through, slowly switching, individual circuits on, untill the faulty circuit trips the breaker,

please note though, that if the fault is on the neutral leg, then the switch will trip,when rcd is switched on.

try the above then get back to us,

but tell us the make and model and year of the van. to help us

stu

Does the one that trips have a button marked test?If so then it is the RCD that is tripping which means that you have an earth leakage fault on on an appliance and you need to isolate the faulty item by doing what I posted earlier.

Saxo1

You need to identify which trip is operating, the switch with a button marked test is an RCD the one without a test button is an MCB.

For an MCB to trip instantaneously it would need to be seriously overloaded a 10 Amp MCB will carry 20 Amps for nearly 2 mins so if it is tripping instantaneously you would probably have a short circuit on the wiring in the van.

I doubt that it is the MCB,it is more likely to be the RCD which will trip at a very low earth fault current in milliseconds but you need to determine which one it is and then isolate the faulty item by switching as stated previously.

Saxo1

are you sure it has an electric heater ,the early ones were gas only

red light means no gas

stu

carver cascade 2 ge

means gas/electric