What will be the cable size for a 3 phase motor with running current 16A, 36KW and 380V. Cable length 20 meter
Answer:
Did anyone notice that 16A, 36KW and 380V is inconsistent, To be on the safe side I'd go with the 16mm² wire or a #4 if I was using US wire sizes. By they way, if it is actually 16 amps, one would need 12ga wire in areas of the U.S. using the NEC as section 430-22(a) requires branch circuit conductors to have an ampacity of 125% of full load current (at least in the old copy of the code that I have)
Cable sizing is determined purely, and I repeat, purely by the continuous running current of the device that needs to be wired. As in your case, the motor has a running current of 16A. Note that at no one time do we consider the starting current.
After the continuous running current has been determined, we use the American Wire Gauge (AWG) standards to determine the size of the conductor.
For a 16A current, the conductor size should be a minimum of AWG 13 which is an equivalent of 2.62 sq mm (or a diameter of 1.828 mm). A cable of this size should be able to withstand the short but high starting current.
I have added a link to guide you more on the AWG standards.
A 36 KW motor on a 380 volt system will draw a max current of 54.6 amps. You need to size the cable for the full load amps. The 16 amps maybe the run current for a very light load.
The answers post by the user, for information only, FunQA.com does not guarantee the right.
More Questions and Answers: