True/False
Indicate whether the
statement is true or false.
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1.
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The NEC tables list the amount of current that the motor is expected to draw
under a full load condition.
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2.
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The values listed in Table 430.248 are for motors that operate under high speeds
and torques.
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3.
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Table 430.250 is used to determine the full load current of two phase
motors.
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4.
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One of the factors that must be taken into consideration when determining the
conductor size is the temperature rating of the devices and terminals.
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5.
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Most motor circuits are protected by dual-element time delay fuses or inverse
time circuit breakers.
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Completion
Complete each
statement.
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6.
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The current ratings for ____________________ phase AC motors are given in Table
430.248.
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7.
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Synchronous motors are often made to have a leading power factor by
____________________ of the rotor current.
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8.
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Regardless of the temperature rating of the conductor, the ampacity must be
selected from a column that does not exceed the ____________________ rating of the
termination.
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9.
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The temperature ratings of devices such as circuit breakers, fuses, and
terminals are found in the ______________________________ product directories.
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10.
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Starter sizes are rated by motor type, horsepower, and connected
____________________.
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Short Answer
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11.
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How is the motor overload size determined?
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12.
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What kind of single phase AC motors need to have their running current
determined from the nameplate rating of the motor?
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13.
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When using a two phase, three-wire system, why must the size of the neutral
conductor be increased by the square root of 2, or 1.41?
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14.
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How can the starting current of a squirrel cage induction motor be determined if
the kVA, horsepower rating, and the applied voltage are known?
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15.
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What are the values which are used for determining the overload size for a
motor?
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