NEC 430 Motor Control || 100% Valid Answers.
T or F A branch-circuit overcurrent device can serve as the disconnecting means for a stationary
motor of 1/8 hp or less. correct answers True
Each motor used in a continuous duty application and rated more than 1 hp shall be protected
against overload by a separate overload device that is responsive to motor current. The overload
device for motors with a marked temperature rise 40°C or less, shall be rated at no more than
_____ percent of the motor nameplate full-load current rating.
80
115
125
175 correct answers 125
T or F Motor control circuits shall be arranged so they will be disconnected from all sources of
supply when the disconnecting means is in the open position. correct answers True
A motor can be provided with combined overcurrent protection using a single protective device
to provide branch-circuit _____ protection where the rating of the device provides the overload
protection specified in 430.32.
short-circuit
ground-fault
motor overload
all of these correct answers All of these
A separate overload device used to protect continuous-duty motors rated more than 1 hp shall be
selected to trip at no more than _____ percent of the motor nameplate full-load current rating if
marked with a service factor of 1.15 or greater.
110
115
120
125 correct answers 125
Motor control circuit conductors that extend beyond the motor control equipment enclosure shall
have short-circuit and ground-fault protection sized not greater than _____ percent of the value
specified in Table 310.16 for 60°C conductors.
100
150
300
400 correct answers 300
A motor disconnecting means can be a listed _____.
, molded case circuit breaker
motor-circuit switch rated in horsepower
molded case switch
any of these correct answers any of these
In determining the highest rated motor for purposes of complying with 430.24, 430.53(B), and
430.53(C), the highest rated motor shall be based on the rated full-load current as selected _____.
from the motor nameplate
from Tables 430.247, 430.248, 430.249, and 430.250
by multiplying the horsepower by 746 watts
using the largest horsepower motor correct answers from Tables 430.247, 430.248, 430.249, and
430.250
An individual disconnecting means shall be provided for each motor controller and be located
_____ from the controller location.
in sight
within 3 ft
within 10 ft
within 25 ft correct answers in sight
Overcurrent protection for motor control circuits shall not exceed _____ percent if the conductor
is based on Table 310.17 and does not extend beyond the motor control equipment enclosure.
100
150
300
400 correct answers 400
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.
space
ventilation
protection
all of these correct answers Ventilation
The motor _____ currents listed in Tables 430.247 through 430.250 shall be used to determine
the ampacity of motor circuit conductors and short-circuit and ground-fault protection devices.
nameplate
full-load
power factor
service factor correct answers full-load
T or F A branch-circuit overcurrent device can serve as the disconnecting means for a stationary
motor of 1/8 hp or less. correct answers True
Each motor used in a continuous duty application and rated more than 1 hp shall be protected
against overload by a separate overload device that is responsive to motor current. The overload
device for motors with a marked temperature rise 40°C or less, shall be rated at no more than
_____ percent of the motor nameplate full-load current rating.
80
115
125
175 correct answers 125
T or F Motor control circuits shall be arranged so they will be disconnected from all sources of
supply when the disconnecting means is in the open position. correct answers True
A motor can be provided with combined overcurrent protection using a single protective device
to provide branch-circuit _____ protection where the rating of the device provides the overload
protection specified in 430.32.
short-circuit
ground-fault
motor overload
all of these correct answers All of these
A separate overload device used to protect continuous-duty motors rated more than 1 hp shall be
selected to trip at no more than _____ percent of the motor nameplate full-load current rating if
marked with a service factor of 1.15 or greater.
110
115
120
125 correct answers 125
Motor control circuit conductors that extend beyond the motor control equipment enclosure shall
have short-circuit and ground-fault protection sized not greater than _____ percent of the value
specified in Table 310.16 for 60°C conductors.
100
150
300
400 correct answers 300
A motor disconnecting means can be a listed _____.
, molded case circuit breaker
motor-circuit switch rated in horsepower
molded case switch
any of these correct answers any of these
In determining the highest rated motor for purposes of complying with 430.24, 430.53(B), and
430.53(C), the highest rated motor shall be based on the rated full-load current as selected _____.
from the motor nameplate
from Tables 430.247, 430.248, 430.249, and 430.250
by multiplying the horsepower by 746 watts
using the largest horsepower motor correct answers from Tables 430.247, 430.248, 430.249, and
430.250
An individual disconnecting means shall be provided for each motor controller and be located
_____ from the controller location.
in sight
within 3 ft
within 10 ft
within 25 ft correct answers in sight
Overcurrent protection for motor control circuits shall not exceed _____ percent if the conductor
is based on Table 310.17 and does not extend beyond the motor control equipment enclosure.
100
150
300
400 correct answers 400
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.
space
ventilation
protection
all of these correct answers Ventilation
The motor _____ currents listed in Tables 430.247 through 430.250 shall be used to determine
the ampacity of motor circuit conductors and short-circuit and ground-fault protection devices.
nameplate
full-load
power factor
service factor correct answers full-load
