Article 430
plainly indicate
The motor disconnecting means for a motor shall ______ whether it is in the open (off) or closed (on) position.
200 Amp
What is the maximum feeder overcurrent protection for the following motors? Use an Inverse Time Breaker. One 20-hp three phase 230 volt motors Three - 3-hp single-phase, 230 volt motors.
23.4 Amps
What is the minimum load current rating for the branch circuit conductors for a 3-hp 1-phase 230 volt motor?
3730 watts
What is the output wattage of a 3-phase, 208 volt, 5-hp motor?
8 AWG
What minimum size equipment grounding conductor is required for a 175-amp motor from table 250.122?
short-circuit ground-fault motor overload
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.
True
Each motor shall be provided with an individual controller.
25
Feeder tap conductors supplying motor circuits, with an ampacity at least one-third that of the feeder, shall not exceed _____ ft in length.
300
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 310.15(B)(16) for 60° C conductors.
the controller disconnecting means is lockable, in accor dance with 110.25 locating the motor disconnecting means within sight of the motor is impractical locating the motor disconnecting means within sight of the motor introduces additional or increased hazards to people or property
The motor disconnecting means shall not be required to be in sight from the motor and the driven machinery location, provided _______ .
11,150
The volt-amps of a 10-hp, 230 volt, 3-phase motor are closest to _________.
7
Torque requirements for motor control circuit device terminals shall be a minimum of _______ lb-in. (unless otherwise identified) for screw-type pressure terminals used for 14 AWG and smaller copper conductors.
Part II
What Part of Article 430 deals with Motor Circuit Conductors?
28 Amps
What is the feeder ampacity for one 3-phase, 3-hp, 208 volt, motor and two 3-phase 2-hp, 208 volt motors?
a and b
A ______ rated in amperes shall be permitted as a controller for all motors.
disconnecting means
A ______ shall be located in sight from the motor location and the driven machinery location.
not greater than the largest rating or setting of the
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.
26 Amps
he full-load current of a 3-phase, 2-hp, synchronous, 460 volt motor at unity power factor is ________?
False
A motor controller shall open all conductors to the motor where not used as a disconnecting means.
125
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.
125 percent of the motor's full-load current rating as deter mined by 430.6(A)(1) 430.22
Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity not less than ______rating.
NEC Tables
For general purpose applications, the motor branch-circuit short-circuit and ground-fault protection device shall be sized based on the ______ values.
80
For stationary motors of 2 hp or less and 300V or less on ac circuits, the controller can be an ac-rated only general-use snap switch where the motor full-load current rating is not more than ______ percent of the rating of the switch.
horsepower
If a motor disconnecting means is a motor-circuit switch, it shall be rated in ______ .
500
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.
True
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.
True
Motor controllers and terminals of control circuit devices shall be connected with copper conductors unless identified for use with a different conductor.
ventilation
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.
on wooden floors
Open motors having commutators or collector rings shall be located or protected so that sparks cannot reach adjacent combustible material. This shall not prohibit the installation of these motors.
a and b
Overload devices are intended to protect motors, motor control apparatus, and motor branch-circuit conductors against ______.
True
The disconnecting means for the controller and motor shall open all ungrounded supply conductors.
starting
The motor branch-circuit short-circuit and ground-fault protective device shall be capable of carrying the______ current of the motor.
lower than
The motor controller shall have horsepower ratings at the application voltage not______ the horsepower rating of the motor.
60 Amp
What size branch-circuit protection is required for a 30-hp, 480 volt, 3 phase, squirrel-cage, autotransformer starting motor protected by dual element fuses?
10-AWG THW
What size conductors are required to feed a 1.5-hp, 230 volt, single-phase motor? The motor is 150 feet from the source. Do not exceed NEC recommendations.
12-AWG THW
What size conductors are required to feed a 1.5-hp, 230 volt, single-phase motor? The motor is 150 feet from the source. Do not exceed NEC recommendations.