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Most caravan inlets are rated at IP45, the same as the  CEE plugs and sockets.

You really need to get a caravan type consumer unit as they have MCB's with double pole switching.  It is usual to have 6amp for  fridges and water heater and 10 amp for 13 amp socket supply.  By nature the RCD is double pole.

Cabling around the camper must be in a minimum of 1.5mm flexible not twin and earth.  However the cable from the inlet to the consumer unit must be 2.5mm flexible so I have used that size throughout.

Hope this helps

Bob

ps no need for a ring main, a radial system is ok because of fuse / wire sizes. 

 You need ip rated if water getting to the unit is an issue,but bear in mind you may install the unit in a dry place,but would it be subect to water if you have to wet pack?The ip rated d.b,s are probably a little more expensive.

You can use your ip rated leads to feed the d.b.The unit you fit for example to outside of the camper is not a socket(cammando) it is a fixed plug inverted.So your H.U lead has a plug on one end which you plug into the site supply and a socket on the other end which plugs into the plug fixed on the outside of your trailer (all commando type).The plug in turn then connects to the feed wherever you have fitted your d.b(consumer unit).You can buy these commando plus and sockets from any camping shop or electrical wholesalers .You would also need to run a 6mm min earth cable from the d.b and connect to the metal framework of the t.t ( it should have a sign electrical connection do not remove) This earths the frame.

A lot of people have 12v installed mainly to use for none hook up sites,plus the water pumps are usualy 12v the fridges usualy will run of 12v,mains and gas ,but if you use it on 12v it will drain your battery like you never know .The trouble with 12v is

1-the batteries are heavy

2-the batteries need care.if they are left without regulor charge and discharge they will die. (they are best left on a near perminent slow electronic charger)

3-a 12v fridge will soon flatten your battery and even a tv for a few days.

4-What happens when your battery goes flat?Not all sites will charge it and if they do you will have to pay,plus the charge will take all day .A rapid charge 1or 2 hours that garages have are not good for the batteries and can bend the plates.

12v is only ok as a back up or very short break.A lot of campers have a mains system with a built in charger to charge the batteries whilst on hook up and use it for awhile to keep the batteries in good condition. ie you can switch between mains and 12v.

hope this helps                         GCB

I would concur with Bob's comments above on the mains side.

I'm afraid I can't agree with GCB that 12v  is only for back up or short breaks though! Admittedly I've got a 110Ah battery but that would comfortably last me 2 weeks average usage if it was just the water pump and lighting. The only thing I have which uses and great amount of power is the fan on the gas blow air system - I don't bother with TVs and the like, everything else will run off gas.

Glen

Info I have given is as per BS regs.  The reason for flexible is because of vibration in transit.

Please note that electric switches etc either 12 or 240volt should not be in gas cylinder box for obvious reasons.

Regards Bob