OPENBOOK EXAM #7

In general switches shall be so wired that all switching is done in the ___ conductor.

• a. Grounded

• b. Ungrounded

• Both a and b

• Neither a nor b

Material identify by the subscript letter ___ includes text extracted from other NFPA documents.

• W

• X

• Y

• Z

Insulating conductors smaller than ___, intended for use as grounded conductors of circuits, shall have an outer identification of white gray color.

• #4

• #2

• #1/0  

• #250 kcmil

“Z.P.” is an abbreviated marking used for motor to indicate ___.

• Single-phase

• Induction-protected

• Thermally protected

• Impedance protected

A pool panel-board, not part of the service equipment, shall have a grounding conductor installed between ___.

• Its grounding terminal and a separate ground

• Its grounding terminal and a ground rod

• Its grounding terminal and the grounding terminal of the service equipment

• Its grounding terminal and bonding grid

Overcurrent protective device shall be so selected and coordinated as to permit the circuit protective devices used to clear a fault without the occurrence of extensive damage to the electrical components of the circuit. This fault shall be assumed to be ___.

      I.       Between any circuit conductor and the grounding conductor or enclosing metal raceways

    II.      Between two or more of the circuits conductors.

• I only

• II only

• Both I and II

• Neither I nor II

The ampacity for conductors is derated when the ambient temperature exceeds.

• 30-degree F

• 72-degree F

• 86-degree F

• 104-degree F

Transformers insulated with a dielectric fluid installed indoors and rated over ___ shall be installed in a vault.

• 112.5KVA

• 35,000VA

• 35KV

• 35KVA

Which of the following requires a moisture seat at all points of termination?

• Under-plaster extension

• Bare conductor feeder

• Liquid tight flexible metal conduit

• Mineral-insulated cable

For a feeder supplying household cooking equipment and electric clothes dryers the maximum unbalanced load on the neutral conductor shall be considered as ___ of the ungrounded conductors.

• 40%

• 50%

• 70%

• 80%