NO people! Are you mad ........... 
20 X 500watt min = 10000Watts no way on a single ring.
Sod it I will just copy and past........
Common Conversions British Commonwealth and other 240 volt countries
Circuits :
10A * 240V = 2400W and 80% safe usage is 1920W
15A * 240V = 3600W and 80% safe usage is 2880W
25A * 240V = 6000W and 80% safe usage is 4800W
30A * 240V = 7200W and 80% safe usage is 5760W
45A * 240V = 10800w and 80% safe usage is 8640W <<<<<<<<<THIS!
You not going to do it with a normal house main. You will be very close to making it all go pop!
Rule I go by is no more than 3kw a socket and no more than 6kw in total on the socket main.
Cooker is run off seperate circut at 45amp so if you could connect 10 pcs to that circut and 10 to the socket main you will be fine!
Do not run 20 pcs from a single circut main. Also your house will only be 100amp main fuse and thats only 24000watt rated so you need half of that to be safe.

20 X 500watt min = 10000Watts no way on a single ring.

Sod it I will just copy and past........

Common Conversions British Commonwealth and other 240 volt countries
Circuits :
10A * 240V = 2400W and 80% safe usage is 1920W
15A * 240V = 3600W and 80% safe usage is 2880W
25A * 240V = 6000W and 80% safe usage is 4800W
30A * 240V = 7200W and 80% safe usage is 5760W
45A * 240V = 10800w and 80% safe usage is 8640W <<<<<<<<<THIS!

You not going to do it with a normal house main. You will be very close to making it all go pop!

Rule I go by is no more than 3kw a socket and no more than 6kw in total on the socket main.
Cooker is run off seperate circut at 45amp so if you could connect 10 pcs to that circut and 10 to the socket main you will be fine!

Do not run 20 pcs from a single circut main. Also your house will only be 100amp main fuse and thats only 24000watt rated so you need half of that to be safe.
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