The make and number of plugs on your EHU makes no difference as to what you can plug in. It is the amp rating from the bollard on site that will dictate what you can plug in and use.
A 1100w appliance will use about 5 amps and a 1600w appliaces will use about 7 amps, so you wouldn't be able to use it on a site that only has 6 amps at the bollard.
There was an an article about this in Practical Caravan recently and this is what they said:
Basically what you need to do is some simple maths. Add together the total wattage of all the appliances/lights you want to use. Then you divide the watts by the volts to give you the amps.
For example: Heater = 2000w Kettle = 750w Mains light bulbs 2x40w = 80w Fridge = 125w TV = 50w TOTAL = 3005w
3005w divided by 230v = 13 amps.
Whether the site has 6A, 10A or 16A you still have to be careful as it doesn't mean the whole site can be drawing this current at the same time. The less demand you place on the site's supply, the lower your chance of tripping the bollard out (including all the other people connected to the same one as you - NOT a good way to make friends with your neighbours and the Wardens!!)
Try to avoid using heavy current draining appliances (domestic kettles, microwaves etc...) If you can't live without these things then make sure you buy low wattage appliances. Also remember that some appliances like microwaves and TVs use more current on start up than they do on steady running.
We usually use a couple of lights and a heater on EHU. All our cooking is done on the gas stove and if we do need extra lights, we use battery powered camping lanterns.
This is a very simple guide but we have copied it and put it in with our camping stuff as a rough reminder:
HOOK UP RATING MAX WATTAGE 3 amps 690w 6 amps 1380w 10 amps 2300w 16 amps 3680w
Hope that helps a bit. Just remember that it is better to over estimate power usage than to under estimate and you should be fine.
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