What size branch-circuit conductors are required for

the welder indicated in Table 13-2 in your book? 

 Use 230 volts , 90 A

and 100% duty cycle:

A welder with its own integral disconnecting means (mounted on the welder) also requires a separate disconnecting means (Mounted on the wall) for extra safety.

If, for some reason, the circuit breaker will not allow the motor (squirrel-cage)  to start, your breaker is inverse-time circuit breaker type, and the motor FLA is 378 amps what would be the maximum size of breaker adjustment that you could use.

What is the minimum size of conductor of a 3/4 hp, 208 V single-phase AC motor if the name plate FLA is 12.5 amps. The TTC is 60 degrees C?

Answer AWG

What is the Maximum Overload heater required, using a time-delay fuse to protect a 575 V, three-phase, insulation class B , 120 hp,  S.F. 1.0 squirrel-cage, continuous duty, ventilated AC motor with a nameplate full load current of 110.6 A?

What is the minimum RW90 copper conductor size a 575 V, three-phase, insulation class A , 100 hp squirrel-cage, continuous duty, ventilated AC motor with a nameplate full load current of 96.8 A?

What maximum size of instantaneous-trip breaker would be used if the motor FLA is 78 amps.