DN comm last final
NEC 230.71 permits not more than ____ disconnects to serve as the building disconnecting means
6
In the United States, ____ Hz is standard or the fundamental frequency
60
If the selected OCPD has a rating greater than 100-amperes, the conductors to be installed shall be selected from either the 75 degrees Celsius or ___ degree Celsius column of NEC table 310.15(b)(16)
90
____ wire is seldom used to branch circuits, but because of weight and cost factors, it is frequently selected for feeders and services
Aluminum
Most fluorescent lamps with energy savings ballasts, compact fluorescent lamps (CFLs), LEDs, and halogen lamps meet the high-efficacy requirement. ______ do not.
Conventional incandescent lamps
A Toxicity Characteristic Leaching Procedure rating means that the lamp has passed ____ tests regarding the toxicity of the lamp
EPA
The ___ program includes such things as replacing old style magnetic ballasts with high-efficiency electronics ballasts, controlling lighting with timers and occupation sensors, and replacing low-efficiency appliances with high efficiency appliances
Energy Star
On a transformer the primary connections are done to the ____
The H termination points
____ is the ability of the lamp to portray objects as normally as possible
The color rendering probability
Recessed luminaires are usually supported by ____ that are attached to the luminaires' rough-in box
adjustable rails
The feeder overcurrent protection is sized for the ____ of the feeder conductor
ampacity
The photocell control device of a light-sensitive cell and a(n) ____ that increases the signal until it is sufficient to operate a relay that controls the light
amplifier
NEC 110.16 has requirement for placing a notice on certain equipment to warn qualified persons of the serious hazard of ____ flash events
arc
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.
astronomic
For fluorescent and HID luminaires, the volt-ampere allowance is based on the rating of the ____
ballast
On a three phase 208/120v panel circuit 37 would be what color
black
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) ____
capacitor
In the insurance office, a reception area is provided with a(n) ____ to provide a different "look" for the clients
combination lighting system
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
continuous
the ampacity is the allowable ampacity multiplied by the ____ factor
derating
____ fuses are designed to withstand motor-starting inrush currents and will not open needlessly
dual-element, time delay
In the insurance office, a separate, insulated-grounding conductor in installed with the feeder circuit and is connected to the neutral conductor at the service. This grounding system reduces, if not eliminates the ____ that often is (are) present in the conventional grounding system.
electromagnetic interference
The sump pump motor is protected by a manual motor starter and is controlled by a ____
float
Color selection for ungrounded "hot" conductors can be just about any solid color except green, white, gray, or any color conductor(except ___) that has three continuous white stripes.
green
____ are multiples of a fundamental frequency
harmonics
Today's liquid filled transformer have their windings immersed in highly refined mineral oil(combustible), siliconefluid, edible seed oilbased delectric coolant, or other acceptable nontoxic liquids that have ____ properties
high dielectric
For most applications, the motor circuit switch for a motor must be
horsepower rated
The temperatures of an electrical arc, such as might occur on a 480Y/277-volt solidly grounded, wye connected system, are ____
hotter than the surface of the sun
The lower the ____ of the grounding path, the greater the ground-fault current
impedance
The luminaire 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
in continuous operation
In the plans for the commercial building, high-efficiency energy-saving fluorescent lighting and LED lighting is used.Very few ____ are used
incandescent lamps
The grounding terminal of each of the receptacles in a computer room is connected to a(n)
insulated equipment grounding conductor
Dry-type transformer are widelt used because they are ____ than comparably rated liquid-filled transformers
lighter in weight
To determine reasonable minimum size for a neutral conductors, two types of loads must be considered- ____
linear and nonlinear
The circuit directory gives the "____" in a wording that would be clear for "nonelectrical" people to decipher and identify the circuit number for luminaries, receptacles, appliances, or equipment
load/area
The two basic methods of metering are primary high-voltage metering and ____
low-voltage metering
____ is the amount of light received in a unit of time on a unit area at a unit distance from a point source of one candela
lumen
In general, panelboards are constructed so the ____ run vertically for nearly the height of the panelboard
main feed busbars
For a fluorescent lamp, the inside of the tube is coated with a phosphor (a fluorescing material) air is evacuated, and an inert gas plus a small quantity of ____ is released into the tube
mercury
The reason the code uses the term ____ instead of motor is that, in many instances, the motor is inside an enclosure and is out of sight until an access panel is removed
motor location
A(n) ____ branch circuit must supply only line-to-neutral loads if the luminaires are connected line-to-neutral
multiwire
When you are wiring the primary side of a transformer, do you need to bring a grounded conductor to the transformer.
no
on a 3-phase, 4-wire, wye system, ____ reduction is allowed for nonlinear loads
no
Three separate neutral conductors are installed to reduce the possibility of a conductor overheating from ____ currents
nonlinear
When sizing feeder conductors____ noncoincident loads (loads unlikely to be operated simultaneously such as the air-conditioning and the heating) need be included
only the larger of any
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
open delta
The circuit to the circulating pump will be supplied from the ____ so that the water will continue to circulate if the utility power fails.
optional standby power panel
What color is the hi leg in a delta transformer hook up
orange
in a commercial building, it is the ____ responsibility to provide power for the elevator; illumination for the public areas such as hallways, stairways, and publics toilet rooms; and heat for the common areas of the building.
owner's
separate feeders are to be run from the main service equipment to each of the area of the commercial building. Each feeder will terminate in a ____, which generally will be installed in the area to be served.
panelboard
In lamp designations PAR means
parabolic reflector
NEc 310.8 set forth requirement for installing ____ conductors. there requirements intended to ensure the conductors will share the current equally to prevent overloading individual conductors
parallel
Incandescent, open, or ____ lamps in lampholders; and pendant lampholders are not permitted in clothes closets
partially open
GFPE monitors are designed to sense ____ faults only.
phase-to-ground
GFCI protection can be attained using GFCI circuit breakers or GFCI ____
receptacles
Recessed luminaries have to be securely fastened to the ceiling framing members using bolts, screws, or ____.
rivets
The installation of luminaries, lighting outlets. and supports is covered in Article 410 of the NEC Article 410 set forth the basic requirements for the installation, commonly referred to as the "____".
rough-in
The reasoning for identifying the system voltage(s) and phases is ____
safety
A motor may be loaded continuously up to the horsepower obtained by multiplying the rated horsepower by the ____
service factor
The ____ is defined in NEC Article 100 as the point of connection between the facilities of the utility and the premises wiring
service point
LED lighting could be called "____ lighting"
solid-state
NEC 250.64(C) states that grounding electrode conductors generally are not permitted to be____
spliced
The ____ is an example of equipment that is operated by an automatic control system
sump pump
____ that have the light source completely enclosed are permitted in clothes closet
surface-mounted or recessed fluorescent luminaires
The ____ feature of the receptacle provides protection from lightning and other severe electrical surges that may occur in the electrical system
surge protection
____ means the difference between motor winding temperature and the ambient temperature
temperature rise
Throughout this country, and for that matter, throughout the world, ____ is(are) the common reference point for all electrical systems
the earth
If the ampacity of a feeder does not match a standard OCPD rating, then ____ be used.
the next higher standard rating may
Currents of the 3rd harmonic and odd multiples of the 3rd harmonic(9th, 15th, 21st, etc.) add together in the common neutral conductors of a 3-phase system,instead of cancelling each other. These odd multiples are referred to as
triplens
To get accurate current readings where harmonics are involved, ammeters referred to as "____"
true rms
The light-producing element in the incandescent lamp is a ____ wire called the filament
tungsten
____ is the most common cause of motor failure
unbalanced voltage
For every ____ degree Celsius rise above the motor's rated temperature, the motor's insulation life is cut in half
10
In three-phase motors ,each phase is ___ degrees out of phase (symmetrical) with the other phases.
120
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
125
What is the minimum starting current for a 240 volt, 3-phase, Code letter J, 7-1/2 horsepower motor.
128 amperes
A washer-dryer rated for 4000 VA at 208Y/120 volts single-phase must have a branch-circuit ampacity of at least ____ amperes
20
NEC 408.36(A) stipulates that if the panelboard contains snap switches with a rating of ____ amperes or less, the panelboard overcurrent protection is not permitted to exceed 200 amperes.
30
An appliance is rated at 4500 volt-ampere, 240 volts. What is the maximum size fuse permitted?
30-ampere
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.
3000
The minimum size conductors, 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
4
Often the load is such that parallel conductors should be considered. This usually occurs with loads over ____ amperes
400
____ occur when an ungrounded "hot" conductor comes in contact with a grounded surface or grounded equipment.
Ground faults
____ 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
Mercury vapor
Utilities make up the connections on the line side and load side of their transformers according to the ____ requirements
NESC
On a three phase 480Y/277 panel, circuit 22 would be what color?
Red (purple)
Multiwire branch circuits are defined in NEC Article 100 as a branch circuit that consists of two or more ____ conductors that have a voltage between them, and a grounded conductors that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system.
ungrounded
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 conductors and/or raceway size.
voltage drop
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.
watts
Conductors for 4800Y/277- volt systems are generally brown, orange, ____ for the ungrounded conductors and gray for the grounded conductor
yellow
