Basic Motor Controls-MC Article 430 - Motors, Motor Circuits,
and Controllers || Graded A+ Already.
When an overload device sized in accordance with 430.32(A)(1) and (B)(1) is not sufficient to
start the motor, higher size sensing elements shall be permitted if the trip current does not exceed
_____ percent of the motor nameplate full-load current rating, when the motor is marked with a
service factor of 1.12. correct answers 130
Unless overload protection is provided by other approved means, the minimum number of
overload units required for a three-phase ac motor is _____. correct answers Three
The motor branch-circuit short-circuit and ground-fault protective device shall be capable of
carrying the _____ current of the motor. correct answers Starting
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 _____ percent of the full-
load current given in Table 430.248. correct answers 250
Where the motor short-circuit and ground-fault protection devices determined by Table 430.52
do not correspond to the standard sizes or ratings, a higher rating that does not exceed the next
higher standard ampere rating shall be permitted. 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. correct answers All of these (short-circuit, ground-fault, motor
overload
A feeder supplying fixed motor load(s) shall have a protective device with a rating or setting
_____ branch-circuit short-circuit and ground-fault protective device for any motor in the group,
plus the sum of the full-load currents of the other motors of the group. correct answers not
greater than the largest rating or setting of the
Overcurrent protection for motor control circuits shall not exceed _____ percent if the conductor
is based on Table 310.15(B)(17) and does not extend beyond the motor control equipment
enclosure. correct answers 400
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 value
specified in Table 310.15(B)(16) for 60°C conductors. correct answers 300
Motor control circuit transformers, with a primary current rating of less than 2A, can have the
primary protection device set at no more than _____ percent of the rated primary current rating.
correct answers 500
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
and Controllers || Graded A+ Already.
When an overload device sized in accordance with 430.32(A)(1) and (B)(1) is not sufficient to
start the motor, higher size sensing elements shall be permitted if the trip current does not exceed
_____ percent of the motor nameplate full-load current rating, when the motor is marked with a
service factor of 1.12. correct answers 130
Unless overload protection is provided by other approved means, the minimum number of
overload units required for a three-phase ac motor is _____. correct answers Three
The motor branch-circuit short-circuit and ground-fault protective device shall be capable of
carrying the _____ current of the motor. correct answers Starting
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 _____ percent of the full-
load current given in Table 430.248. correct answers 250
Where the motor short-circuit and ground-fault protection devices determined by Table 430.52
do not correspond to the standard sizes or ratings, a higher rating that does not exceed the next
higher standard ampere rating shall be permitted. 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. correct answers All of these (short-circuit, ground-fault, motor
overload
A feeder supplying fixed motor load(s) shall have a protective device with a rating or setting
_____ branch-circuit short-circuit and ground-fault protective device for any motor in the group,
plus the sum of the full-load currents of the other motors of the group. correct answers not
greater than the largest rating or setting of the
Overcurrent protection for motor control circuits shall not exceed _____ percent if the conductor
is based on Table 310.15(B)(17) and does not extend beyond the motor control equipment
enclosure. correct answers 400
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 value
specified in Table 310.15(B)(16) for 60°C conductors. correct answers 300
Motor control circuit transformers, with a primary current rating of less than 2A, can have the
primary protection device set at no more than _____ percent of the rated primary current rating.
correct answers 500
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
