If it is a 3 phase pump, your volt drop is 4% of 400v - so more scope.
If you insist on a heater, the volt drop would need to be calced at 230v, unless you find a 3 phase one
FARMS SHOULD NOT HAVE TN-C-S. Any that do are asking for trouble. Farms generally, as they are in the sticks, have a tranny up a pole, and a TN-S supply.
The only thing that would effect the earth loop on a farm is the fact that you need to clear a fault in 0.2 seconds and not 0.4. How can you make the assumtion that a farm will have higher efl than anywhere else - thats just bol lox.
Also bear i mind that no matter what you decide re the loading - I bed you end up wanting to put a socket in, and a light.........and what happens 10yr down the line when the pump needs to be replaced.......and you go for a bigger one??
If you insist on a heater, the volt drop would need to be calced at 230v, unless you find a 3 phase one
FARMS SHOULD NOT HAVE TN-C-S. Any that do are asking for trouble. Farms generally, as they are in the sticks, have a tranny up a pole, and a TN-S supply.
The only thing that would effect the earth loop on a farm is the fact that you need to clear a fault in 0.2 seconds and not 0.4. How can you make the assumtion that a farm will have higher efl than anywhere else - thats just bol lox.
Also bear i mind that no matter what you decide re the loading - I bed you end up wanting to put a socket in, and a light.........and what happens 10yr down the line when the pump needs to be replaced.......and you go for a bigger one??
