NEC Article 430,440,445,450

Dry-type transformers 1,000V, nominal, or less, and not exceeding _____ kVA that are installed in hollow spaces of buildings and not permanently closed in by the structure, shall not be required to be readily accessible.

50

If a motor disconnecting means is a motor-circuit switch, it shall be rated in _____

horsepower

Disconnecting means for air-conditioning or refrigerating equipment can be installed _____ the air-conditioning or refrigerating equipment, but not on panels that are designed to allow access to the equipment, and not over the equipment nameplate.

on or within

Where a panelboard is supplied through a transformer, the overcurrent protection shall be located _____.

on the secondary side of the transformer

For other than cord-and-plug-connected portable generators, an emergency shutdown device for a dwelling unit shall be located _____ at a readily accessible location.

outside the dwelling unit

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.

80

The maximum instantaneous trip breaker branch circuit protection for a single-phase motor is _____ percent of the appropriate current rating found in Table 430.52.

800

The ampacity of the conductors from the generator output terminals to the first distribution device(s) containing overcurrent protection shall not be less than _____ percent of the nameplate current rating of the generator.

115

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.

125

Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity not less than _____ rating.

125 percent of the motor's full-load current rating as determined by 430.6(A)(1)

Conductors supplying several motors shall not be sized smaller than _____ percent 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, plus the ampacity of other loads.

125%

Generators with greater than _____ kW rating shall be provided with a remote emergency stop switch to shut down the prime mover.

15

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

175

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.

250

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.

300

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.

400

Article _____ covers motors, motor branch-circuit and feeder conductors and their protection, motor overload protection, motor control circuits, motor controllers, and motor control centers.

430

Stationary generators _____ and less shall be listed.

600V

Part IV of Article 430 specifies devices intended to protect _____ against overcurrent due to short circuits or ground faults.

All of these

Circuit conductors on the output of an adjustable-speed drive system are susceptible to breakdown under certain conditions. Factors affecting the conductors include but are not limited to the output _____.

Any of these

The rules of Article _____, as applicable, shall apply to air-conditioning and refrigerating equipment that DOES NOT incorporate a hermetic refrigerant motor-compressor.

Any of these

Conductors supplying several motors, or a motor(s) and other load(s), shall have an ampacity not less than the sum of 125 percent of the full-load current rating of the highest rated motor plus the sum of the full-load current ratings of all the other motors in the group and 100 percent of the remaining noncontinuous and continuous nonmotor loads.

False

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.

all of these

A motor disconnecting means can be a listed _____.

any of these

The rules of Article _____, as applicable, shall apply to air-conditioning and refrigerating equipment that does not incorporate a hermetic refrigerant motor-compressor. 422

any of these

The disconnecting means for air-conditioning and refrigerating equipment shall be readily accessible and not more than _____ ft from the air-conditioning or refrigerating equipment.

50

For general motor applications, the motor branch-circuit short-circuit and ground-fault protection device shall be sized based on the _____ values.

NEC Table

A branch-circuit overcurrent device can serve as the disconnecting means for a stationary motor of 1/8 hp or less.

True

Article 440 applies to electric motor-driven air-conditioning and refrigerating equipment that has a hermetic refrigerant motor-compressor.

True

Article 445 contains installation and other requirements for generators.

True

Circuit conductors on the output of an adjustable-speed drive system are susceptible to breakdown under certain conditions due to the characteristics of the output waveform of the drive.

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

Multimotor and combination-load air-conditioning equipment shall be provided with a visible nameplate marked with the minimum supply circuit conductor ampacity, the maximum rating of the branch-circuit short-circuit and ground-fault protective device.

True

Where more than one motor disconnecting means is provided in the same motor branch circuit, at least one of the disconnecting means shall be readily accessible.

True

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.

True

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.

Ventilation

A horsepower-rated _____ having a horsepower rating not less than the motor rating shall be permitted to serve as the disconnecting means.

attachment plug and receptacle or flanged surface inlet and cord connector

A _____ rated in amperes shall be permitted as a controller for all motors

branch-circuit inverse time circuit breaker or molded case switch

A _____ shall be located in sight from the motor location and the driven machinery location.

disconnecting means

Where air-conditioning and refrigeration equipment is installed outdoors on a roof, a(an) _____ conductor of the wire type shall be installed in outdoor portions of metallic raceway systems that use compression-type fittings.

equipment grounding

Overload devices are intended to protect motors, motor control apparatus, and motor branch-circuit conductors against _____.

excessive heating due to motor overloads and excessive heating due to failure to start

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 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

For transformers, other than Class 2 and Class 3, a means is required to disconnect all transformer ungrounded primary conductors. The disconnecting means shall be located within sight of the transformer unless the disconnect _____.

location is field marked on the transformer and is lockable open in accordance with 110.25

Generators shall have the _____ conductor sized not smaller than required to carry the maximum unbalanced current as determined by 220.61.

neutral

Transformers with ventilating openings shall be installed so that the ventilating openings are _____.

not blocked by walls or obstructions

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.

not greater than the largest rating or setting of the

The motor controller shall have horsepower ratings at the application voltage _____ the horsepower rating of the motor.

not lower than

Transformer top surfaces that are horizontal and readily accessible shall be marked _____.

to prohibit storage

The equipment grounding conductor terminal bar of a dry-type transformer shall be bonded to the enclosure in accordance with 250.12 and shall not be installed on or over any _____.

vented portion of the enclosure