229.1
For a stationary motor rated at ___ hp or less that is normally left running and is constructed so that it cannot be damaged by overload or failure to start, such as clock motors and the like, the branch-circuit disconnecting means shall be permitted to serve as the controller.
1/8
When motors are ___ hp or greater, the motor nameplate shall include the rated horsepower.
1/8
A toggle switch (standard AC only "light" switch) can be used as the controller (ON/OFF switch) for a stationary motor rated at 2 hp or less and 300 volts or less as long as the switch has an ampere rating that is at least ___% of the motor ampere rating. Note: the NEC® considers a toggle switch to be a general-use snap switch. See the definition in Article 100
125
Branch-circuit conductors supplying more than one motor shall have an ampacity of at least ___ percent of the FLC of the largest motor, plus 100% of the FLC of the other motor(s) in the group.
125
Continuous duty motors with a marked service factor not less than 1.15 shall have the minimum running overload protection sized at ___ percent of the nameplate rating of the motor.
125
For AC adjustable voltage, variable torque drive motors, the ampacity of conductors, or ampere ratings of switches, circuit breakers, or fuses, and ground-fault protection shall be based on the operating current marked on the nameplate. If the current does not appear on the nameplate, the ampacity determination shall be based on ___ of the values given in tables 430.249 and 430.250.
150%
Alternating current, general-use snap switches are UL-listed to control motors rated up to ___ horsepower.
2
Refer to the nameplate and information shown in Figure 230.131. The minimum hp rating of any manufacturer's safety switch must be ___ hp at the applied voltage.
20
Several motors, each not exceeding 1 horsepower in rating, shall be permitted on a nominal 120-volt branch circuit protected at not over ___ amperes.
20
Disregarding exceptions, what is the minimum number of overload units required by the NEC® to protect a 3-phase motor?
3
A code letter D is marked on a motor nameplate. What is its locked-rotor kVA per horsepower?
4.0 - 4.49
For a nonautomatically started motor, the overload protection shall be permitted to be shunted or cut out of the circuit during the starting period of the motor if the device by which the overload protection is shunted or cut out cannot be left in the starting position and if fuses or inverse time circuit breakers rated or set at not over ___ percent of the full-load current of the motor are located in the circuit so as to be operative during the starting period of the motor.
400
The locked-rotor current of a 75 hp, 460-volt, three-phase, Design B motor is ___ amps.
543
Control circuit devices in a motor control starter with screw-type pressure terminals used with 14 AWG copper conductors shall be torqued to a minimum of ___ lb-in. unless identified for a different torque value.
7
___ shall be placed in all service-entrance motor control centers to isolate service busbars and terminals from the remainder of the motor control center.
Barriers
A motor control circuit ___. I. carries electric signals to the controller and carries the main power II. does not carry electric signals to the controller but does carry the main power III. carries the electric signals to the controller but does not carry main power
III only
Refer to Figure 232.103. ___ could be used as a disconnecting means for a 5 horsepower, 240-volt, single-phase motor.
Neither I nor II
The current from ___ is used to determine the branch circuit conductor size for a 1Ø motor.
T.430.248
Instantaneous-trip circuit breakers can be installed ___.
as a part of listed combination with a motor controller
Motor controllers must be marked with ___. I. maximum rated voltage II. maximum hp or current rating
both I & II
NEC® 430.102 requires that a ___ have a disconnecting means and that it be in sight.
both motor's controller, and motor
In general, a motor disconnecting means must disconnect ___.
both the motor and controller
Any motor application shall be considered at ___ unless the nature of the apparatus it drives is such that the motor will not operate continuously with load under any condition of use.
continuous duty
An individual disconnecting means shall be provided for each controller and shall disconnect the controller. The disconnecting means shall be located ___ the controller location.
in sight from
Which one of the devices listed is NOT permitted to be used to provide branch-circuit and short-circuit protection for motors?
knife switch
The secondary circuits of wound-rotor ac motors, including conductors, controllers, resistors, and so forth, shall be permitted to be protected against overload by the ___.
motor-overload device
A motor is installed as part of a factory-wired piece of equipment. It is required to be grounded, and no additional connections are required at the motor terminal housing during the equipment installation. A separate means for motor grounding at the motor terminal housing shall ___.
not be required
Which of the following is not required on a motor nameplate?
watts
Conductors for a motor used in a short-time, intermittent, periodic, or varying duty application shall have an ampacity of not less than the percentages of the motor nameplate current ratings shown in Table ___.
430.22(E)
