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Review 3

Answer the following questions without referring to the material just presented.

  1. Of the two most common low voltage power circuit breaker mounting methods, the fixed configuration is most commonly used because it is less expensive.
    TRUE FALSE

  2. When a drawout type low voltage power circuit breaker is in the “Connected” position, both _______________ and _______________ electrical connections are made.

  3. If you were called upon to select a low voltage power circuit breaker, name at least five selection factors, standard or special factors, you might consider during the selection process.
    ______________________________________________________
    ______________________________________________________
    ______________________________________________________
    ______________________________________________________
    ______________________________________________________

  4. In a low voltage power circuit breaker ratings table, the “Frame Size” indicates the circuit breaker’s interrupting rating in amperes.
    TRUE FALSE

  5. The nominal voltage range for low voltage power circuit breakers in the domestic market governed by ANSI Standards is _______________ to 600 Volts AC.

  6. In terms of the international market governed by IEC Standards, Ue stands for the _______________ _______________, such as 415 volts.

  7. In today’s global market, standards are usually so similar that a low voltage power circuit breaker designed and tested to IEC Standards can simply be certified to ANSI Standards and vice versa, without the need for additional testing.
    TRUE FALSE

  8. A low voltage power circuit breaker is always provided with instantaneous protection against closing in on a fault current.
    TRUE FALSE

  9. Low voltage power circuit breakers are sized, selected, and applied to safely handle the _______________ fault current it could possibly be exposed to.

  10. Circle the letter next to the testing standard that most influences the design and testing of low voltage power circuit breakers used in the United States.
    (a) ANSI C50.51
    (b) UL1866
    (c) IEC 947-2
    (d) ANSI C37.50

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