425 Reading Worksheet

A 120-volt, single-phase, 300-ft. branch circuit carries 5 amps and has a 5.0 voltage drop. What is the resistance of the conductors per foot in this circuit?

.003 ohms

At least one receptacle outlet shall be installed directly above a show window for each ___ ft or major fraction thereof of show window area measured horizontally at its maximum width.

12

A circuit containing 12 AWG THHN conductors is a ___ rated circuit when protected by a 15-amp rated circuit breaker.

15-amp

A branch-circuit voltage that exceeds 277 volts to ground and does not exceed 600 volts between conductors is used to wire the auxiliary equipment of electrical discharge lamps mounted on poles. The minimum height of these luminaires shall not be less than ___ feet.

22

The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed ___ percent of the branch-circuit ampere rating where lighting units, cord-and-plug-connected utilization equipment not fastened in place, or both, are also supplied.

50

Determine the voltage drop on a branch circuit given the following:* current = 5 amps* length = 300 ft.* resistance = 4 ohms/1000 ft.

6 volts

A 175 KVA, single-phase transformer having a secondary voltage of 120/240 has been installed at a multifamily dwelling. The current available at the secondary is ___.

729 amps

___ luminaires used in a show window shall be permitted to be externally wired.

Chain-supported

Receptacles connected to circuits having different ___ on the same premises shall be of such design that the attachment plugs used on these circuits are not interchangeable. I. current (AC or DC) II. frequencies III. voltages IV. wattages

I, II & III only

A switch or circuit breaker should disconnect all grounded conductors of a circuit ___. I. before it disconnects the ungrounded conductors II. after it disconnects the ungrounded conductors III. simultaneously as it disconnects the ungrounded conductors

II or III only

In a commercial building, ___ receptacles must have GFCI protection.

bathroom

Where outdoor lampholders have terminals that puncture the insulation and make contact with the conductors, they shall be attached only to ___.

conductors of the stranded type

Three-way and four-way switches shall be wired so that all switching is done ___.

only in the ungrounded circuit conductor

Raceways on exterior surfaces of buildings shall be arranged to drain and shall be ___ for use in wet locations.

suitable