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What is the required amperage for a 25 hp induction-type squirrel cage motor operating at 460 volts?
What is the minimum fire rating of a transformer vault?
What is the required amperage for a 25 hp induction-type squirrel cage motor operating at 230 volts?
What is the minimum fire rating of a transformer vault that is protected by an automatic sprinkler system?
What is the maximum size inverse time breaker allowed for a 30 HP three phase 480 volt motor?
What is the minimum height of a doorway sill on a transformer vault?
If no other information is given, a continuous-duty motor that draws 100 amperes must be protected by an overload device rated at not more than:
A phase converter is an electrical device that:
Given a circuit serves a 10-hp, 208-volt, 3 phase, squirrel-cage Design-B motor, with a nameplate rating of 37 amps, what is the maximum permitted operational setting of an adjustable inverse-time breaker?
According to the NEC, the locked rotor current of an electric motor is approximately _____ times a full load current given in the appropriate tables.
What code letter on a motor nameplate indicates the highest locked rotor current in relation to horsepower?
Which of the following are recognized types of phase converters?
A controller with a slash rating of ________, shall only be applied in a solidly grounded circuit in which the nominal voltage to ground from any conductor does not exceed the lower of the two values of the controllerâ€™s voltage rating and the nominal voltage between any two conductors does not exceed the higher value of the controllerâ€™s voltage rating
Means shall be provided to deduce the residual voltage of a capacitor to ___________.
The rating of the overcurrent protective device for a circuit supplying a hermetic motor compressor must be at least what percent of the nameplate rated-load current?
On a 3 HP 120 volt DC motor, what is the minimum size inverse time circuit breaker required?
Branch-circuit conductors supplying a single motor-compressor must have an ampacity not less than what percent of the motor-compressor rated-load current?
A combination of the power converter, motor, and motor-mounted auxiliary devices is known as:
What must the ampere rating be for a disconnecting means for a motor circuit rated 600 volts, nominal, or less?
Live parts of motors must be guarded if they operate at or over:
Room air conditioners not rated at over 250 volts, single phase shall be permitted to be
Exposed live parts of motors and motor controllers operating at 50 volts or more between terminals must be guarded against accidental contact by a suitable enclosure, or as follows:
A 240-volt single-phase room air conditioner shall be considered as a single-phase motor unit if its rating is not more than:
Conductors supplying two or more motors must have an ampacity equal to the sum of the full-load current rating of all the motors plus what percent of the highest rated motor in the group?
Single phase cord and plug connected room air conditioners shall be provided with factory installed __________ protection.
What size THW copper conductors are required for a continuous duty, 208 V, 30 HP motor with a nameplate rating of 74 amperes?
A dry-type transformer rated at 112-1/2 or more installed in a transformer room must have a fire rating of at least?
What is the required amperage for a 10 hp induction-type squirrel cage motor operating at 230 volts?
A 20-ampere ac snap switch may disconnect a 2-horsepower motor with a maximum full-load current of:
Dry-type transformers installed indoors that are more than 112 1/2 kVA shall be installed in __________.
What is the required amperage for a 10 hp induction-type squirrel cage motor operating at 460 volts?
Dry-type transformers rated over 35,000 volts must be installed: