cable sizeing

[shaun1234]

can some 1 help please am gettin blaged by a 9kw 3 phase over door heater am trying to work out the cable size for it but keep getting different answers for the current am useing the formular, (watts/volts)/1.73= line current and get the answer 22.6 but when i type it into doncaster cables calculator i get 16.26

this is just a college exersize and i cant work out whos right me or the computer

cheers

 

[Andy™]

voltage is 400, not 230

and i get 13a / phase

and i only get 16a if your input is 9KVA

 

[Evans Electric]

How about a 2.5 X 3core SWA cable . Presume the heater is not 6 miles from the board.

 

[shaun1234]

its def in kilowatts on that site it comes up 16.27a,

i was doin it in 230v instead of 400v school boy error nice 1 mate

its 35 meters in trunken and conduit so il go for singles il get there in the end just fell at the first hurdle really

cheers lads