Inline RCD on EHU cable? What amp rating pls?

[autorouter]

That is only one aspect of it, and already mentioned; yes it has to be double pole, so it disconnects both live conductors: line and neutral. Reason is, the low TT earthing impedance, and you are sitting in a lived conductive part in fault condition, thats bonded to the earthing conductor. Nothing to do with reversed polarity. Reversed polarity is checked upon initial dead tests. That if you have it tested.

Yes this is true. But a motorhome needs to be safe for both standard polarity and reverse polarity if it is used outside the UK. In Germany, Spain and much of Europe, some campsites and aires have the domestic sockets which are the Schuko type and are reversible. So it's 50/50 whether the polarity is reversed or not. That's another reason to be sure the trip switches are all double pole types.

 

[Raul]

Yes this is true. But a motorhome needs to be safe for both standard polarity and reverse polarity if it is used outside the UK. In Germany, Spain and much of Europe, some campsites and aires have the domestic sockets which are the Schuko type and are reversible. So it's 50/50 whether the polarity is reversed or not. That's another reason to be sure the trip switches are all double pole types.

Yes I agree entirely, and this is a bonus ( having a double pole), IF you connect to a foreign installation with reversed polarity.

But, gigs venues, fair grounds, market stalls, carnivals, circus including caravan camping and motorhomes parks, mobile homes, motorhomes etc. this are classed as special locations, with TT earthing, all have double pole or 4 pole in 3 phase, and they don't go abroad. All in UK where we have polarity tested and confirmed on the schedule of test, done in a very specific sequence to prove the circuits are ok and safe, before are made live.