Can anyone remind me in what situations double pole (as opposed to single pole) rcd protection must be used (caravans come to mind)?

Regards

Edited: 22 February 2013 at 01:50 PM by geov

Caravans is one, caravan sites is another, and marinas too.

Then there are situations where the N needs to be disconnected - e.g. if an RCD is used as the main switch on a domestic single phase installation.

Where the RCD is downstream of another RCD and it's required to have discrimination between the two in the case of N-E faults.

Where local generation can operate in parallel with the mains (e.g. a PV inverter) and the circuit the generator is connected to also supplies current consuming equipment.

probably a few others too...

- Andy.

Thanks Andy, was having a bit of a "blonde" moment!