The cross sectional area of the cable must (under the regs for caravan hookups) be related to the current rating of the plug to which it is attatched,the blue commando plugs are rated at 16 amps.
The size of the cable required is dependant upon the load applied, although a 1.5mm cable will carry 16amps, in overload conditions it could overheat.Caravans in general have more electrical equipment fitted than a tent based unit and require a2.5mm cable.
The size of the cable makes no difference to the time an RCD will trip.
There a several camping type hookups that are fitted with 1.5mm cable sold by online stores. just because it is sold in a high street store or online doesn't necessarily guarantee that it is fitted with a suitable cable.A popular item that has been recommended by posters on this forum proudly boasts that it is fitted with a cable to HO5VVF,if you look up the spec you will find that it is a light duty cable not for use outdoors at 230v in sub zero temperatures.I suggest that going by what I read on this site that a lot of campers frequently camp in sub zero temperatures.
The regs require that temporary outdoor supplies(caravans etc ) should be supplied with heavy duty flexible cables,a lot aren't,a lot use arctic flex.
How many have checked to see what rating their cable is it should be rated at 450 to 750 volts and be marked at the very minimum HO5RN-F but preferably HO7RN-F,but this only applies to equipment covered by the regs and unless they have changed they don't apply to tents.
Saxo1
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