NEC Article 430 - Motor Circuits, Controllers, and Adjustable-Speed Drives Yr 4 Semester 1 || with Valid Answers 100%.

NEC Article 430 - Motor Circuits, Controllers, and Adjustable-
Speed Drives Yr 4 Semester 1 || with Valid Answers 100%.
Article _____ covers motors, motor branch-circuit and feeder conductors and their protection,
motor overload protection, motor control circuits, motor controllers, and motor control centers.
correct answers 430

430.1

For general motor applications, the NEC table values for full load current values shall be used
instead of the actual current rating marked on the motor nameplate when determining overload
protection. correct answers FASLE

430.6(A)(1)

The motor full-load currents listed in Tables 430.247 through 430.250 shall be used to determine
the ______. correct answers -ampacity of motor circuit conductors
-current ratings of switches
-current rating for short-circuit and ground-fault protective devices

430.6(A)(1)(1), (2), and (3)

For general motor applications, separate motor overload protection shall be based on _____.
correct answers the motor nameplate current rating

430.6(A)(2)(1)

Motors shall be located so that adequate _____ is provided and so that maintenance, such as
lubrication of bearings and replacing of brushes, can be readily accomplished. correct answers
ventilation

430.14(A)

Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity not
less than _____ rating. correct answers 125 percent of the motor's full-load current

430.22

Conductors supplying several motors shall have an ampacity not less than _____ of the full-load
current rating of the highest rated motor, plus the sum of the full-load current ratings of all other
motors in the group. correct answers 125 percent

430.24(1) and (2)

, Overload devices are intended to protect motors, motor control apparatus, and motor branch-
circuit conductors against _____. correct answers excessive heating due to motor overloads and
excessive heating due to failure to start

430.31

A separate overload device used to protect continuous-duty motors rated more than 1 hp shall be
selected to trip at no more than _____ of the motor nameplate full-load current rating if marked
with a service factor of 1.15 or greater. correct answers 125 percent

430.32(A)(1)

Each motor used in a continuous-duty application and rated more than 1 hp shall be protected
against overload. The overload device for motors with a marked temperature rise of 40°C or less
shall be rated at no more than _____ of the motor nameplate full-load current rating. correct
answers 125 percent

430.32(A) and (A)(1)

Part IV of Article 430 specifies devices intended to protect _____ against overcurrent due to
short circuits or ground faults. correct answers -motor branch-circuit conductors
-motor control apparatus
-motors

430.51

Short-circuit and ground-fault protection for a branch-circuit to which a motor or motor-operated
appliance is connected shall be capable of carrying the ______ current of the motor. correct
answers starting

430.52(B)

The maximum dual-element time-delay fuse branch-circuit protection for a single-phase motor is
_____ of the appropriate full-load current rating found in Table 430.248. correct answers 175
percent

430.52(C)(1) and Table 430.52(C)(1)

The maximum rating or setting of an inverse time breaker used as the motor branch-circuit short-
circuit and ground-fault protective device for a single-phase motor is _____ of the full-load
current given in Table 430.248. correct answers 250 percent

430.52(C)(1) and Table 430.52(C)(1)