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Hi just after opinions on this one got three 3 phase supplies all 25mm 4 core swa, armour not been used for earth would you run a seperate 16mm earth for each supply or just loop all the earths from 1 16mm all the supplies are right next to each other
 
Why cant you use the armour?

You've got 3 cables all running to and from the same locations?
If they were all running to different places, i'd say 1 x 16mm each...
It doesn't seem enough... but then 3 sounds like too much.
Go for 2 x 16mm:rolleyes:
 
it's 3 small boards all.next to each all fed from the same main distribution board just not sure whether I'd get away with the 1 earth going to an earth block and then to each board
 
If you have correctly sized the main earth for the 3 phase supply to the main board, the surely you should use the same sizing formula for sizing the main earthing conductors to the remaining 3 sub main distribution boards, after all commonsense rules OK.
 
Hi - a 16mm for each and you probably don't need to look further, but otherwise few questions to help clarify -
Installation means of earthing?
Are sub boards having the same earthing design? Incoming conductor size?
Bonding requirements?
 

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