Wilkies5 -

You need to take account of the ratings of the applicances in use at the same time. The 'fridge will always be on and from the list you give you might use the kettle in the evening with the lights and TV on. The only one of these with a high power rating will be the kettle. We use an "old fashioned" one on the gas to avoid the problem.

Check the wattage of each appicance and add up all that might be used together. Divide the total by 240 (the voltage) and you will get the number of Amps required. Be aware that some items have a "peak" drain when first turned on so I always leave a margin of error, say 8 amps and below on a 10 amp EHU.

Do you also have hot water? If yyou use this on electric I think it will use about 4amps when on. Also a fire \ blow heating. Although both of these can normally be used on Gas if required.

HTH

regards

Tony

heres something a member posted for EHU sizes.

The results are based on a uk supply rated at 230 volts 

60 Watts    =    0.26 Amp

100 Watts    =    0.43 Amp

200 Watts    =    0.87 Amp

300 Watts    =    1.30 Amp

400 Watts    =    1.74 Amp

500 Watts    =    2.17 Amp

600 Watts    =    2.61 Amp

700 Watts    =    3.04 Amp

800 Watts    =    3.48 Amp

900 Watts    =    3.91 Amp

1000 Watts    =    4.35 Amp

1100 Watts    =    4.78 Amp

1200 Watts    =    5.22 Amp

1300 Watts    =    5.65 Amp

1400 Watts    =    6.09 Amp

1500 Watts    =    6.52 Amp

1600 Watts    =    6.96 Amp

1700 Watts    =    7.39 Amp

1800 Watts    =    7.83 Amp

1900 Watts    =    8.26 Amp

2000 Watts    =    8.70 Amp

2100 Watts    =    9.13 Amp

2200 Watts    =    9.57 Amp

2300 Watts    =    10.00 Amp

2400 Watts    =    10.43 Amp

2500 Watts    =    10.87 Amp

2600 Watts    =   11.30 Amp

2700 Watts    =   11.74 Amp

2800 Watts    =    12.17Amp

2900 Watts    =   12.61 Amp

3000 Watts    =    13.04 Amp

3100 Watts    =    13.48 Amp

3200 Watts    =    13.91 Amp

3300 Watts    =    14.35 Amp

3400 Watts    =    14.78 Amp

3500 Watts    =    15.22Amp

3600 Watts    =    15.65 Amp

I am a simple non technical bloke - basically anything that heats uses more amps so electric heater, kettle,water heater, electric grill, electric oven and microwave.

If you are on a site with 10 amps or above i wouldn't expect you to have a problem. If less than 10 amps are available on site make sure you don't have any of the above items on when your son is using his nebuliser

The Watts to Amps list that Pete has posted is very handy. I have printed it off and keep it with my camping gear as a handy reference. Saves having to do mental arithmetic and long division when you are supposed to be relaxing. Just add up the wattage of the appliances you are using (which is usually stamped on the appliance) and check the list. If you wish to use an electric kettle, for instance, when you are running an electric heater either turn the heater down to a low setting or turn it off until the kettle has boiled.

Having spoken recently to some itenerant workers who live on a campsites it is very unusual to blow the entire campsite fuses. If you have the proper trip switches in your caravan or tent then these should trip before the campsite supply trips. If the overload goes beyond that then the power will trip at the campsite pillar just for your unit. It shouldn't affect anyone else. All you have to do is pop out, open the plastic cover on the front of the pillar (usually held by one or two thumbscrews) then switch it back on again and replace the cover securely. 

That's a handy list..

Although we've just got into the habit of not having more than one "heating" appliance on at once..clicking the heater off,whilst the kettle boils etc

It has always interested me why there isn't some sort of "variable trip" fitted into 'vans/MHs though..something which could be set just below what the site supply is rated.That way,you'd only need to reset the onboard switch if it tripped(..and not have to pather around the site in your dressing gown in the middle of the night!).

(..Also we've been on sites where the hook-up junction box has been gaffa taped and cable tied shut   )