rear power sockets

English...........showering???????????

IMO 6 mm wire is minimum and one must be aware that there are several methods of sizing wire. BS, AWG, Auto to name a few.
Bottom line is the overall size of the conductor NOT the overall size of the wire and insulation is what you must be concerned with. The larger the conductor the lower the resistance and therefore less voltage drop which is your ultimate goal.
So ,again IMO, you should use a minimum of 6 mm square cross sectional area (6 mm wire you buy from an auto shop is only about 4 mm square although a lot people use this and seem happy)
Cross sectional area is equal to Pi x radius of the the conductor squared.
Best to use 6mm square wire for both positive and negative and wire the negative all the way back to the engine or suitable earth return point not just the car body at the rear of the vehicle.
Suggest you use an automatic ciruit breaker (say 20 A) as close as practical to the battery poisitive and a 10 A fuse for the appliances. Theoretically the CB protects the cable, the fuse the appliance. The fuse should therefore be close to the appliance. An in-line fuse is a possibility.
Can't help with a supplier of Hella connectors but agree they are far better than the standard cigarette lighter type. Try the Hella web site for UK distributors.
Alternative is to use the connector supplied by the fridge manufacture eg Engel make one with a long loom and one with a short length of cable including 10A in line fuses.

Hi Craig,

There is a table on the following website that might help you with cable sizes.
www.windsun.com/Hardware/Wire_Table.htm

I would run 6 mm2. This is the size of each core.

It does't really matter what plug you use as long as its of good quality and is rated to perhaps 20 amps. You should be able to find them in your local auto accessory shop. Use a 20 amp fuse too I suppose. Make sure the main cable is fused as close to the battery as possible. (In case your in an accident and the cable is damaged somewhere along its length)

I have recently run really large cable to the rear and installed a fuse box for any other future accessories in the rear.

good luck

I run 3 cigarette lighter plus and a hella plug in the back of mine, I ran one peice of 6mm to the front of the truck direct to the battery through a 30amp fuse. The earth is direct to the chasis. I also run a self priming water pump for drinking water, which pulls about 3.5amps. It all works great, I know some people will disagree on my methods, but it's simple, and works spot on. I was running my thermal cooler off one of my cigarette lighter plugs but it melted it. (scarey) They are rated to 10amps, it only pulls 4amp. It's the continous heat that must cause the problem. I installed the hella (16amp rating) and it's been spot on ever since. If you give me an email address I will email you some photo's if you like.

Thanks for all the replies , Ill get cracking on wiring it up and see what happens.

thanks
Craig