Low Voltage & Power Limited Systems

14 Questions | Total Attempts: 1628

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Low Voltage & Power Limited Systems

Think you have a handle on low voltage and power limited systems? Test your knowledge of rules governing the installations and upgrades of these systems.


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Questions and Answers
  • 1. 
    Electrical metal tubing must be threaded when used in high-hazard locations.
    • A. 

      True

    • B. 

      False

  • 2. 
    EMT must be securely fastened within ____ feet of every box, cabinet or termination fitting, and at intervals not exceeding ____ feet.
    • A. 

      5 / 10

    • B. 

      3 / 5

    • C. 

      1 / 5

    • D. 

      3 / 10

  • 3. 
    EMT may be used as the sole support for cameras mounted outside when boxes are attached
    • A. 

      True

    • B. 

      False

  • 4. 
    EMT installed horizontally in holes bored or punched in wood or metal framing members, or in notches in wooden members, is not considered supported.
    • A. 

      True

    • B. 

      False

  • 5. 
    The maximum distance between pull points is ____.
    • A. 

      50 feet

    • B. 

      100 feet

    • C. 

      The length of the available snake

    • D. 

      Not applicable. The code specifies no maximum distance

  • 6. 
    To protect wire from abrasion, bushings are required by a fitting that provides a smooth, rounded insulating surface for all wires ____ AWG and smaller.
    • A. 

      6

    • B. 

      10

    • C. 

      16

    • D. 

      18

    • E. 

      All wires of all sizes require such a bushing

  • 7. 
    Boxes or other enclosures are required for Class 2 and Class 3 splices, or terminations.
    • A. 

      True

    • B. 

      False

  • 8. 
    Under a roadway, buried nonmetallic raceways must be buried at least ____. 
    • A. 

      6 in.

    • B. 

      18 in.

    • C. 

      2 ft.

    • D. 

      6 ft.

  • 9. 
    Separation of ____ is required between Class 2 or Class 3 circuits and between raceways or cables containing power conductors.
    • A. 

      1/4 in.

    • B. 

      1/2 in.

    • C. 

      2 in.

    • D. 

      Not applicable. No separation is required.

  • 10. 
    Class 2 cables must not be supported by a raceway unless ____.
    • A. 

      The raceway is rigid metal conduit

    • B. 

      The raceway provides power to the equipment controlled by the Class 2 cable

    • C. 

      Plenum wire ties are used at intervals of 18 inches or less

    • D. 

      Not applicable. No exception exists

  • 11. 
    Optical fiber cables not terminated at equipment and not identified for future use with a tag ____.
    • A. 

      Are considered abandoned and must be removed

    • B. 

      Pose no hazard because they carry no current

    • C. 

      Can be “toned out” at a future date for use

    • D. 

      May be left in place only in industrial applications

  • 12. 
    Which of the following is not permitted?
    • A. 

      Cables may be supported by the structural components of the building.

    • B. 

      Raceways and cables may be supported by independent support wires attached to the suspended ceiling.

    • C. 

      Cables may be attached to the support wire of a suspended ceiling.

    • D. 

      Cables may be secured by straps, staples, hangers or similar fittings, as long as they are designed not to damage the cable.

  • 13. 
    Unless protected by a steel plate, cables cannot be closer than ____ from the edge of framing membersor furring strips.
    • A. 

      1/2 in.

    • B. 

      1 in.

    • C. 

      1 1/4 in.

    • D. 

      1 1/2 in.

  • 14. 
    Working spaces for equipment operating at not more than 30VAC or 60VAC can be smaller than the distance specified in Table 110.26.
    • A. 

      True

    • B. 

      False