PEC - Chapter4 (Sheet3-Part3)

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Author:
Camskie
ID:
306460
Filename:
PEC - Chapter4 (Sheet3-Part3)
Updated:
2015-08-17 07:45:27
Tags:
camille chapterfour
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Description:
Chapter4
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  1. For stationary motors rated at more than __ hp dc or __ hp ac, the disconnecting means shall be permitted to be a general-use or isolating switch where plainly marked “__________________."
    • 40
    • 100
    • Do not operate under load.
  2. For torque motors, the disconnecting means shall be permitted to be a ____ switch
    general-use
  3. The disconnecting means for motor circuits rated __ volts, nominal, or less shall have an ampere rating not less than 115percent of the full-load current rating of the motor
    600
  4. The disconnecting means for motor circuits rated __ volts, nominal, or less shall have an ampere rating not less than __percent of the full-load current rating of the motor
    • 600
    • 115
  5. Disconnecting means for a torque motor shall have an ampere rating of at least __ percent of the motor nameplate current
    115
  6. Exception: A listed nonfused motor-circuit switch having a horsepower rating equal to or greater than the equivalent horsepower of the combined loads, determined in accordance with 4.30.9.10(c)(1), shall be permitted to have an ampere rating less than ___ percent of the sum of all currents at the full-load condition
    115
  7. For small motors not covered by Table 4.30.14.1, Table 4.30.14.2, Table 4.30.14.3, or Table 4.30.14.4, the locked-rotor current shall be assumed to be __times the full-load current
    six
  8. Circuit conductors supplying power conversion equipment included as part of an adjustable-speed drive system shall have an ampacity not less than ___ percent of the rated input to the power conversion equipment
    125
  9. The disconnecting means shall be permitted to be in the incoming line to the conversion equipment and shall have a rating not less than __ percent of the rated input current of the conversion unit
    115
  10. FPN: The relationship between motor current and motor temperature changes when the motor is operated by an _______. When operated at reduced speed, overheating of motors may occur at current levels less than or equal to a motor’s rated full load current. This is the result of reduced motor cooling when its shaft-mounted fan is operating less than rated nameplate RPM
    adjustable speed drive
  11. Flexible metal conduit or liquidtight flexible metal conduit not excee___ mm in length shall be permitted to be employed for raceway connection to a motor terminal enclosure
    1 800
  12. _________ devices shall not automatically reclose the circuit
    Fault-current interrupting
  13. Exception: Automatic reclosing of a circuit shall be permitted where the circuit is exposed to ___ and where such automatic reclosing does not create a hazard to persons
    transient faults
  14. The ultimate trip current of overcurrent (overload) relays or other motor-protective devices used shall not exceed ___ percent of the controller’s continuous current rating. Where the motor branch-circuit disconnecting means is separate from the controller, the disconnecting means current rating shall not be less than the ultimate trip setting of the overcurrent relays in the circuit
    115
  15. Exception: Live parts of motors operating at more than ___ volts between terminals shall not require additional guarding for stationary motors that have commutators, collectors, and brush rigging located inside of motor-end brackets and not conductively connected to supply circuits operating at more than ___ volts to ground
    • 50
    • 150
  16. Where the frame of the motor is not grounded, it shall be permanently and effectively ___ from the ground
    insulated
  17. The frames of portable motors that operate at over ___ volts to ground shall be guarded or grounded
    150
  18. The junction box required by 4.30.13.5(a) shall be permitted to be separated from the motor by not more than ___ mm, provided the leads to the motor are stranded conductors within Type AC cable, interlocked metal tape Type MC cable where listed and identified in accordance with 2.50.6.9(10)(a), or armored cord or are stranded leads enclosed in liquidtight flexible metal conduit, flexible metal conduit, intermediate metal conduit, rigid metal conduit, or electrical metallic tubing not smaller than metric designator ___ (trade size ), the armor or raceway being connected both to the motor and to the box
    • 1 800
    • 12

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