Cable Size for Motor Circuit

Homework? plz explain with example is usually homework.

→ British Standard 7671.

i) Rated Full load current of the motor

ii) Cable size for the above current, duly taking into account all the rating factors for cables

iii) Maximum Voltage drop for the given cross section of the cable and for the given length AND whether this voltage drop is within permissible limits for the motor under consideration.

iv) Maximum anticipated short circuit current & the maximum fault clearing time and the short time with stand capacity of the cable must be more than square of this current & time multiple.

Better leave it to experts.

also consider starting method to make sure the vd during starting is within limits

What is the maximum permissible voltage drop at the motor terminals during starting and during running according to NEC and BS?.

E65

The NEC requires that the conductor size be the motor FLA + 25%. Do you use this requirement in your location.

No! We are from India. We follow the Standard Current carrying capacities of Cables, duly applying all rating factors and arrive at the continuous current rating.