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Hi guys bit of knowledge needed..
Have a 2x185mm 3phase supply going to a panel board with 800amp main switch from a UK Power networks transformer about 15m away, also run with them a 185mm earth which goes to a earth bar next to the panel board where all the outgoing swa earth overlays are connected also. What size earth should go to the panel board a 185mm as that's the size of the incoming earth and theain switch is 800amps or can it be smaller like a 70mm as the outgoing earth's are all connected to the earth bar..
Some thoughts on this would be great.. Thanks
 
The adiabatic equation is not needed for line conductors over 35mm so as long as the earth cable is the same material as the line conductor the earth will need to be at least half the size of the line conductor feeding the panel.
 

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