Quiz on the Code

Motors 

1. To size a controller for a motor, the contactor shall have a horsepower rating at 1.25 the horsepower rating of the motor.   
 (a) true
 (b) false

2. To ground the frames of motors you use Table 250.122 for the minimum conductor size.
 (a) true
 (b) false

3. Capacitors that are installed with motor circuits to correct the power factor of the motor are to be connected with wire ampacity of 1.25 × the capacitor current.
 (a) true
 (b) false

4. If a capacitor is installed with a motor on the load side of the motor controller, no separate disconnecting means is required.
 (a) true
 (b) false

5. Motor control circuits need protection based on Art 430.72(B) column A if they have separate overcurrent devices.
 (a) true
 (b) false

6. The branch circuit or feeders supplying a VFD are sized for 110% of the rated input current to the VFD.
 (a) true
 (b) false

Answers:
1. (b) Not less than the HP rating of the motor;  
2. (a) Ref: Art 250.122;  
3. (b) 1.35 × the rated current of the capacitor;  
4. (a) Ref: Art. 460.8(C);  
5. (a) Ref: Article 43.72(A);  
6. (b) 125% of the rated current