TN LLE Motors and Motor Circuits 2

Question 1

Per NEC Table 430.248, what is the full-load current of a 5 HP, single-phase, 230V motor?

Accepted Answer

28 amperes

Answer

15 amperes

Answer

40 amperes

Answer

56 amperes

Question 2

Per NEC 430.22, what is the minimum conductor ampacity for a single motor branch circuit?

Accepted Answer

125% of motor FLC

Answer

100% of motor FLC

Answer

115% of motor FLC

Answer

150% of motor FLC

Question 3

What is the maximum size inverse-time circuit breaker permitted for branch-circuit protection of a single-phase motor per NEC 430.52?

Accepted Answer

250% of FLC

Answer

125% of FLC

Answer

150% of FLC

Answer

300% of FLC

Question 4

Per NEC 430.32, what is the maximum overload protection for a motor with a service factor of 1.15 or greater?

Accepted Answer

125% of nameplate current

Answer

100% of nameplate current

Answer

115% of nameplate current

Answer

140% of nameplate current

Question 5

Per NEC 430.102, a motor disconnecting means must be located where relative to the motor?

Accepted Answer

Within sight from the motor location and the controller

Answer

Within 10 feet

Answer

At the main panel only

Answer

Anywhere on the same floor

Question 6

What is the purpose of motor overload protection separate from the branch circuit breaker?

Accepted Answer

To protect the motor windings from sustained overcurrent that would cause overheating

Answer

To protect against short circuits

Answer

To protect against ground faults

Answer

To control motor speed