ELE 137

3/4

Even though multipair conductors are no longer used extensively in telephone installations, the size of the conduit should be trade size ____ or larger.

10

For every ____ degree Celsius rise above the motor's rated temperature, the motor's insulation life is cut in half.

ballast

For fluorescent and HID luminaires, the volt-ampere allowance is based on the rating of the ____.

Horsepower rated

For most applications, the motor circuit switch for a motor must be ____.

250

For motor branch circuits, the maximum setting of a conventional inverse-time circuit breaker must not exceed ____ percent of the full-load current of the motor

one

For surface-mounted and pendant-hung luminaires, support rods should be placed so that they extend about ____ in. below the finished ceiling.

Diesel fuel

Fuels that may be used in an emergency generator are LPG (liquid propane) gas, natural gas, gasoline, or ____.

In commercial buildings, ____ protection is required for all 125-volt, single-phase, 15- and 20-ampere receptacles installed in bathrooms, in kitchens, on rooftops, outdoors, within 6 ft (1.8 m) from the outside edge of any sink, in indoor wet locations, in locker rooms with adjacent shower facilities, and in garages, bays, and similar areas.

GFCI

Receptacles

GFCI protection can be attained using GFCI circuit breakers or GFCI ____.

liquid

Generator units having a capacity greater than 15 kilowatts generally use ____ cooling.

An ungrounded conductor is also known as a ____ conductor.

Hot

a single cover

If more than one symbol is located immediately adjacent to another, it usually means that a multigang box for multiple wiring devices and ____ are to be installed.

The next higher standard rating may

If the ampacity of a feeder does not match a standard OCPD rating, then ____ be used.

Telephone

If the raceway is for use of the ____ system, the line will be broken and an uppercase T will be inserted.

Owner's

In a commercial building, it is the ____ responsibility to provide power for the elevator; illumination for the public areas such as hallways, stairways, and public toilet rooms; and heat for the common areas of the building.

Are always grounded

In a communications system, the inside conduit drops ____.

Always separated from each other

In a dual-duct system, the junction box is constructed so that the power and communications systems are ____.

key

In a typical branch-circuit installation for an emergency system, ____-operated switches are installed to prevent unauthorized personnel from operating the luminaires.

Capacitor

In an inductive circuit with an uncorrected power factor of 40 percent to 60 percent, the power factor can be corrected to within 5 percent of unity by the addition of a(n) ____.

Parabolic reflector

In lamp designations, PAR means ____.

60

In the United States, ____ Hz is standard or the fundamental frequency.

600

In the boiler heating circuit, the main lugs connect to two ____-kcmil-per-phase conductors run to an 800-ampere switch.

Solid neutral

In the case of a delta, 3-phase, corner-grounded "B" phase system, a device called a ____ can be installed in the "B" phase.

Combination lighting system

In the insurance office, a reception area is provided with a(n) ____ to provide a different "look" for the clients

Kilo

In the metric system, what is the prefix for 1000?

120

In three-phase motors, each phase is ____ degrees out of phase (symmetrical) with the other phases.

partially open

Incandescent, open, or ____ lamps in lampholders; pendant luminaires; and pendant lampholders are not permitted in clothes closets.

slimline lamps

Instant-start lamps require single-pin bases and are generally called ____.

For motors, the OCPDs are ____.

Inverse-time circuit breakers

watts

It is necessary that the illumination of a building comply with energy codes. These codes usually evaluate the illumination on the basis of the average ____ per square foot (meter) of illumination load.

solid-state

LED lighting could be called "____ lighting."

Liquidtight flexible nonmetallic conduit marked as ____ has a smooth seamless inner core and cover bonded together and one or more reinforcement layers between the core and covers for layered conduit.

LFNC-A

Metal raceways not properly grounded could become "____" and present a shock hazard.

Live

To plan any electrical wiring project, the first step is to determine the ____ that the electrical system is to serve.

Load

1066

Low-voltage power circuit breakers are listed under UL Standard ____.

transfer switch

Manufacturers of generators, transfer switches, and signaling devices also provide panelboards that have the ____ built right into the panelboard. This is a nice feature for those installations where one panelboard is to serve the emergency or standby power requirements.

Hospitals

Many types of healthcare facilities are covered in NEC® Article 517. ____ generally have the most stringent requirements, and clinics and medical and dental offices have the least stringent requirements.

Six

NEC® 230.71 permits not more than ____ disconnects to serve as the building disconnecting means.

Continuous

NEC® 422.13 requires that the branch circuit for a storage-type electric water heater with a capacity of 120 gallons (450 L) or less is considered to be a(n) ____ load.

High harmonic currents associated with ____ loads cause havoc by overheating the neutral conductor.

Non-linear

____ boxes are used primarily to install ceiling outlets.

Octagonal

No

On a 3-phase, 4-wire, wye system, ____ reduction is allowed for nonlinear loads.

Astronomic

On lighting controlled by timers, an ____ feature is extremely desirable because it provides sunset ON and sunrise OFF that change automatically day by day as the sunrise and sunset times change every day.

Neoprene gasket

One type of sump pump that is available commercially has a start-stop operation due to water pressure against a ____, which in turn pushes against a small integral switch within the submersible pump.

Isolated ground receptacles are required by NEC® 406.2(D) to have a(n) ____ triangle on their face.

Orange

The purpose of the National Electrical Code® is the practical safeguarding of ____ from hazards arising from the use of electricity.

Persons and property

adjustable rails

Recessed luminaires are usually supported by ____ that are attached to the luminaires' rough-in box.

tacks

Recessed luminaires have to be securely fastened to the ceiling framing members using bolts, screws, or ____.

When the wiring method is cable, you are stuck with the conductor insulation colors typically provided by the manufacturer. For three conductor cable, this will typically be black, white, and ____.

Red

In general, the letter-type designation R formerly referred to a ____-based covering and now indicates thermoset insulation.

Rubber

A ____ switch is used where it is desired to control a light or group of lights, or other load, from one switching point.

Single-pole

Most electricians refer to ____ switches as "toggle switches" or "wall switches."

Snap

Leveling screws

Some floor boxes must be installed to the correct height by adjusting the ____ before the concrete is poured.

heating, refrigerating and air-conditioning

The ASHRAE Handbook is considered the Bible of the ____ industry, as the NEC® is to the electrical industry.

R

The Class ____ fuse is a nonrenewable cartridge type and has a minimum interrupting rating of 200,000 RMS symmetrical amperes.

NFPA 101

The Life Safety Code is another name for ____.

Qualified person

The NEC® defines a(n) ____ as one who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved.

Open delta

The ____ connection scheme has the advantage of being able to provide either 3-phase or 3-phase and single-phase power using only two transformers.

Surge protection

The ____ feature of the receptacle provides protection from lightning and other severe electrical surges that may occur in the electrical system.

Sump pump

The ____ is an example of equipment that is operated by an automatic control system.

Service point

The ____ is defined in NEC® Article 100 as the point of connection between the facilities of the serving utility and the premises wiring.

Heating thermostat

The building's occupants will each have a(n) ____ located within their particular area.

75

The combined size of the conductors, splices, and taps shall not fill more than ____ percent of the raceway at the point where the splices and taps occur.

Insulated equipment grounding conductor

The grounding terminal of each of the receptacles in a computer room is connected to a(n) ____.

65

The heat sensor in an electrically heated boiler is adjusted so that it closes when the outside temperature falls below a set point, usually ____ degrees Fahrenheit.

tungsten

The light-producing element in the incandescent lamp is a ____ wire called the filament.

Impedance

The lower the ____ of the grounding path, the greater the ground-fault current.

Under manual control

The luminaires installed for the stairway to the second floor and hallways of a commercial building are ____ when the building is occupied because those spaces have no windows.

emergency

The main purpose of a(n) ____ system is to automatically come on to supply, distribute, and control power and illumination essential for safety to human life in the event that the normal supply of power is interrupted.

4

The minimum size conductor, if all terminals are rated 75 degrees Celsius or higher, is ____ AWG as the allowable ampacity in NEC® Table 310.16(B)(16) is 85 amperes.

Amplifier

The photocell control device consists of a light-sensitive cell and a(n) ____ that increases the signal until it is sufficient to operate a relay that controls the light.

24

The switches used in the low-voltage remote-control system operate on ____ volts.

Duplex convenience receptacles

The symbol for ____ consist of two parallel lines inside, and sometimes extending out of, a circle.

Hotter than the surface of the sun

The temperatures of an electrical arc, such as might occur on a 480/277-volt solidly grounded, wye-connected system, are ____.

Ungrounded

The term ____ means not connected to ground or a conductive body that extends the ground connection.

interrupting capacity

The terms interrupting rating and ____ are used interchangeably in the electrical industry, but there is a subtle difference

Low-voltage metering

The two basic methods of metering are primary high-voltage metering and ____.

LISTED

The wording on a counterfeit UL logo might say "approved" instead of "____."

Backfeed

There have been many injuries and deaths as a result of ____; it has been called "the Hidden Killer."

Whenever a grouping of more than ____ current-carrying conductors exists, an adjustment factor from NEC® Table 310.15(B)(3)(a) must be applied.

Three

Nonlinear

Three separate neutral conductors are installed to reduce the possibility of a conductor overheating from ____ currents.

Linear and non-linear

To determine a reasonable minimum size for a neutral conductor, two types of loads must be considered-____.

True rms

To get accurate current readings where harmonics are involved, ammeters referred to as "____" must be used.

high dielectric

Today's liquid-filled transformers have their windings immersed in highly refined mineral oil (combustible), silicone fluid, edible seed oil-based dielectric coolant, or other acceptable nontoxic liquids that have ____ properties.

A(n) ____ box is used for surface or concealed installations.

Trade size 4 x 4 square

A 3-way switch has a common terminal to which the switch blade is always connected, and it has two other terminals called ____ terminals.

Traveler

Underfloor

Two methods can be used to provide floor outlets: (1) installing ____ raceway or (2) installing floor boxes.

IC

Type ____ luminaires are permitted to be installed in direct contact with thermal insulation.

NESC

Utilities make up the connections on the line side and load side of their transformers according to the ____ requirements.

3-phase

Water heaters are available for commercial occupancies in many sizes and voltages, and for both single and ____ supply.

128 amperes

What is the minimum starting current for a 240-volt, 3-phase, Code letter J, 7-1/2-horsepower motor?

Straight current-limiting

When compared to other types of fuses, the ____ fuse has the lowest energy let-through values.

Curved lines

When concealed raceways are drawn on plans, they usually are shown as ____.

Circle

When raceways are installed vertically in the building, from one floor to another, the vertical direction may be represented by the arrow symbol inside a(n) ____.

Protection

When referring to motor controllers in the United States, we prefer to use the term ____ instead of coordination because coordination has a different meaning.

Only the larger of any

When sizing feeder conductors, ____ noncoincident loads (loads unlikely to be operated simultaneously such as the air-conditioning and the heating) need be included.

Voltage drop

When tabulating materials, take special note of long runs of raceway or cable and determine whether ____ is a problem. This can mean an increase in conductor and/or raceway size.

Do not stand in front

When turning a standard disconnect switch on, ____ of the switch.

UL

Which nonprofit organization publishes the Electrical Appliances and Utilization Equipment Directory (Orange Book)?

Harmonics

____ are multiples of a fundamental frequency.

Switches

____ are not usually permitted on the hinged side of the door but are required to be located on the strike side.

Dual-element, time delay

____ fuses are designed to withstand motor-starting inrush currents and will not open needlessly. 2. a. Nontime-delay

Mercury vapor

____ lamps have the lowest efficacy of the HID family, which ranges from 30 lumens per watt for the smaller-wattage lamps to 65 lumens per watt for the larger-wattage lamps.

Temperature rise

____ means the difference between motor winding temperature and the ambient temperature.

The feeder overcurrent protection is sized for the ____ of the feeder conductor.

ampacity

The circuit directory gives the "____" in a wording that would be clear for "nonelectrical" people to decipher and identify the circuit number for luminaires, receptacles, appliances, or equipment.

load/area

Flexible metal and nonmetallic conduit are commonly used to connect recessed or lay-in ____. When used in this manner, electricians refer to it as a "fixture whip."

luminaires

In general, panelboards are constructed so the ____ run vertically for nearly the height of the panelboard.

main feed busbars

Separate feeders are to be run from the main service equipment to each of the areas of the commercial building. Each feeder will terminate in a ____, which generally will be installed in the area to be served.

panelboard

The reasoning for identifying the system voltage(s) and phases is ____.

scheduling

Working space height is required to not be less than ____ ft. (2.0 m).

6.5

The allowable ampacity of a 4 AWG THHN conductor is 95 amperes. If we have four 4 AWG THHN conductors, what is the adjusted ampacity?

76

If the ambient temperature anywhere along the length of a raceway is less than 78 degrees F or higher than ____ degrees F, the ampacity of the conductors in the raceway, or cable, must be modified by a correction factor.

86

Underfloor signal raceway

A dashed line with an "S" designates a(n) ____.

The cover that is placed on a recessed box containing a receptacle or a switch is called a ____.

Faceplate

Any suitable raceway

Floor boxes, either metallic or nonmetallic, can be wired using ____.

dc

Fluorescent lamps can be operated on a ____ circuit if the proper ballasts are used. A ballast for this type of system contains a current-limiting resistor that provides an inductive kick to start the lamp.

mercury

For a fluorescent lamp, the inside of the tube is coated with a phosphor (a fluorescing material), the air is evacuated, and an inert gas plus a small quantity of ____ is released into the tube.

600

Fused switches are available in ratings of up to ____ amperes in both 250 and 600 volts.

In locations where severe abuse or heavy use is expected, ____ receptacles are recommended.

Hospital-grade

Conventional incandescent lamps

Most fluorescent lamps with energy savings ballasts, compact fluorescent lamps (CFLs), LEDs, and halogen lamps meet the high-efficacy requirement. ____ do not.

125

NEC® 430.24 requires that the conductors supplying several motors, or a motor(s) and other load(s), shall have an ampacity not less than ____ percent of the full-load current rating of the highest rated motor.

permits

NEC® 701.12(E) ____ the connection for a legally required standby system to be made ahead of, but not within, the main service disconnect.

10

NEMA rated motors are designed to operate at plus/minus ____ percent of their nameplate rated voltage.

The term ____ is defined by the NEC® as a channel that is designed and used expressly for the purpose of holding wires, cables, or busbars.

Raceway

At least one ____ is required to be installed above each linear 12 ft (3.7 m) section of show window.

Receptacle outlet

Panelboard

____ schedules are typically provided to detail the circuits and overcurrent protection required for distribution equipment.

Aluminum

____ wire is seldom used in branch circuits, but because of weight and cost factors, it is frequently selected for feeders and services.

Multioutlet assemblies

_____ are similar to surface raceways and are designed to hold both conductors and devices.

Uninterruptible

______ power supply (UPS) systems are often installed to provide "clean power" to critical loads such as computers.

When using cable for the wiring of 3-way switches, NEC 200.7(C)(1) permits the use of a conductor with insulation that is white or ____ or has three continuous white stripes (not too common) as a switch supply only if the conductor is permanently reidentified by painting or other effective means.

gray

Conductors for 480Y/277-volt systems are generally brown, orange, ____ for the ungrounded conductors and gray for the grounded conductor..

yellow

An acceptable impedance for the grounding path associated with normal equipment grounding for branch-circuit wiring is ____ ohms.

1 to 2

According to NEC® Table 220.12, armories and auditoriums should have a calculated unit load of at least ____ volt-amperes per square meter.

11

For show window lighting, allow ____ voltamperes per linear foot (660 volt-amperes per linear meter), or use the connected load if that value is higher.

110

When sizing conductors and overcurrent protection, you must take 100 percent of the noncontinuous loads plus ____ percent of the continuous loads.

125

Most large commercial buildings use two voltages: 480Y/277 volts and ____/120 volts.

208Y

For system voltages of 0 to 150 volts to ground, the minimum depth of working space is ____ ft. (914 mm).

3

NEC® Article ____ applies to motors, including those that are a part of motor-operated appliances unless "specifically amended" by NEC® Article 422.

430

NEC® Article ____ addresses air-conditioning and refrigeration equipment that incorporates hermetic refrigeration motor-compressor(s).

440

A single piece of equipment consisting of a multiple receptacle comprised of four or more receptacles shall be calculated at not less than ____ volt-amperes per receptacle.

90

All working spaces must allow for the opening of equipment doors and hinged panels to at least a ____ degree position.

90

Although several different types of insulation are listed in the NEC®, there are only three different temperature ratings: 60 degrees C, 75 degrees C, and ____ degrees C.

90

EPA

A Toxicity Characteristic Leaching Procedure rating means that the lamp has passed ____ tests regarding the toxicity of the lamp.

soft metric conversion

A ____ is when the dimensions of a product already designed and manufactured to the inch-pound system have their dimensions converted to metric dimensions.

in parallel

A dual-element, time-delay fuse has one or more fusible elements (links) connected ____.

3000

A fluorescent lamp with a 30 in its nomenclature indicates it produces light with a color temperature of ____ K, which would provide good rendition to warm colors.

Service factor

A motor may be loaded continuously up to the horsepower obtained by multiplying the rated horsepower by the ____.

Distribution panel

A rectangle with parallel diagonal lines as the fill pattern represents a ____.

Single-pole

A switch symbol without a number beneath the horizontal line means that a ____ switch should be installed.

20

A washer-dryer rated for 4000 VA at 208Y/120 volts single-phase must have a branch-circuit ampacity of at least ____ amperes.

Circuit breaker

According to NEC® 422.31(B), having a disconnect switch in sight is required if a(n) ____ is not readily accessible.

The contractor

According to the Supplementary General Conditions, who is responsible for any utilities that are damaged?

A continuous row

All receptacles on a phase can be connected in ____, or the receptacles can be connected on alternate phases

Poured concrete

All recessed incandescent luminaires must be equipped with factory-installed thermal protection, unless the luminaire is identified for use and installed in ____.

30-Ampere

An appliance is rated at 4500 volt-ampere, 240 volts. What is the maximum size fuse permitted?

Boiler

An electrically heated ____ may supply heat to all areas of a commercial building.

maximum

An interrupting rating is a(n) ____ rating, which is a measure of the fuse's or circuit breaker's ability to safely open an electrical circuit under fault conditions, such as an overload, short circuit, or ground fault.

fixture

Beginning with the 2008 edition of the National Electrical Code, the term luminaire is used exclusively. Previous editions of the NEC® used the term luminaire followed by the term ____ in parentheses.

Where PVC conduit is connected to a box or enclosure, a ____ is recommended.

Box adapter

H

Class ____ fuses formerly were called NEC® or Code fuses.

Multioutlet branch-circuit ratings are limited to 15-, 20-, 30-, 40-, and 50-ampere except on ____ premises, where they may have a higher rating.

Commercial

Compression fittings for EMT are classified as raintight and ____-tight types.

Concrete

Junction boxes

Conductors to be installed in raceways may be spliced at ____ or within the raceway if the cover of the raceway is removable.

NEC® Table 310.15(B)(16) places the wires available for building construction into two categories: ____ and aluminum.

Copper

An ac-dc general-use snap switch is always marked with the ____.

Current and voltage rating

Triplens

Currents of the 3rd harmonic and odd multiples of the 3rd harmonic (9th, 15th, 21st, etc.) add together in the common neutral conductor of a 3-phase system, instead of canceling each other. These odd multiples are referred to as ____.

Lighter in weight

Dry-type transformers are widely used because they are ____ than comparably rated liquid-filled transformers.

____ is a thin-wall metal raceway that is not permitted to be threaded.

Electrical metallic tubing