Hi there,
I am installing a 5.5kw 3 phase motor what size is this in amps,and also what size cable do i need?
How do i work out future motor conversion?
2006-10-27 23:25:55 · 6 answers · asked by Guy R 1 in Science & Mathematics ➔ Engineering
5.5 kw (7.5hp) Full load current is about 11 amps @ 380/440volts. You will need to allow for up to 8x flc for 6 seconds if DOL,(SD 4x for 12 secs) cable size depends on length, probably 4 sq mm. Back up fuses 20M32 or 20-25A Motor rated MCB.
2006-10-27 23:52:07 · answer #1 · answered by jayktee96 7 · 1⤊ 0⤋
For rule of thumb on motors of this low rating size only, when your sizing your cable for a motor you take the FLA of the motor, and in practice I usually multiply this by 1.25 (allows for Service Factor for some motors which can run at 15% above FLA)
For long cable runs it is important you will need to take into account voltage drop.
Take a look at the NEC Electrical Codes.
2006-10-28 05:29:54 · answer #2 · answered by java 4 · 0⤊ 0⤋
First of all you should know the voltage it runs on. Then the power factor. Only after these two we can decide the current and cable size
2006-10-27 23:29:23 · answer #3 · answered by wisecrack 2 · 1⤊ 0⤋
I am confused
jaytee has it right but just to be sure that you do, I hope you understand you need 3 Cables one for each phase.
2006-10-28 02:36:56 · answer #4 · answered by Anonymous · 0⤊ 0⤋
this needs some calculations first
but if you dont know that
maybe you should not be doing the job
2006-10-27 23:45:21 · answer #5 · answered by Anonymous · 0⤊ 0⤋
need a power factor first
2006-10-27 23:36:37 · answer #6 · answered by Anonymous · 0⤊ 0⤋