want to calculate cable size and swicthgears rate

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ashraf_s_y

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i want to calculate motors cable size and switcher, all motors are 3phase 380Vac, i would to notify you that motor full load starting currents

for are

direct on line connection 600A

part winding 390A

wye-delta open transition 200A

wye-delta close transition 200A

primary resistance 300A

solid state 240A

i hope u can give me how i can calculate the cables size, the circuit breakers and switchgears reat according to the full load starting current and 380Vac.

note:
-all cable should be copper.
-the motors for fire aplication and following the AFPA 20 and NFPA 70.

thank u sir

and waitting ur replay soon

thanks

ashraf samy
 
Re: want to calculate cable size and swicthgears rate

Your post lists the voltage as 380 volts. Should that be 480 volts?
Horse power?
Is the Full load amps = 600?
You listed several starters. Haven't you chosen
one to use? Why all 5?
 
Re: want to calculate cable size and swicthgears rate

dear sir,
i want to know how i can calculate the cable size what ever is the HP or kW, i don't have that experience and i want with ur help to have the equations or tables
the second thing i want to know the tables to how i can choose the circuit breaker or gear switch according to the start current and normal current
thanks


Originally posted by bob:
Your post lists the voltage as 380 volts. Should that be 480 volts?
Horse power?
Is the Full load amps = 600?
You listed several starters. Haven't you chosen
one to use? Why all 5?
Click to expand...
 
Re: want to calculate cable size and swicthgears rate

ashraf_s_y
This forum does not teach the courses you need. Check out a trade school or college near you.
 
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