Electrical Final 3A
If a conductor has a diameter of 80 mils, its diameter in inches is _____.
0.08
What is the total resistance of a two-wire circuit that spans a distance of 100' each way if the resistance per 1,000' is 1.24 ohms?
0.248 ohm
The minimum clearance for overhead service conductors not exceeding 600V that pass over commercial areas subject to truck traffic is ____ ft.
18
Refer to the 2020 edition of the NEC®. A noncontinuous load of three 120V outlets for heavy-duty lamp holders would have a load of _____.
1800VA
A correction factor must be applied if the ambient temperature is above _____.
30°C
Refer to the 2020 edition of the NEC®. The load for 30' of multi-outlet assembly used to supply several loads simultaneously is _____.
5400VA
Refer to the 2020 edition of the NEC®. The load center length for a branch circuit with noncontinuous loads of 125A at 80' from the source, 75A at 110' from the source, and 50A at 100' from the source is _____.
93'
Locations in which flammable gases or vapors may be present in the air in quantities sufficient to produce explosive or ignitable mixtures are identified as _____.
Class I locations
A type of system that can be used to provide zone control in large open spaces is a(n) _____.
EMS
Which of the following is MOST important in choosing the type of luminaire for general illumination in patient observation areas in a health care facility?
Good color rendition
Part III of Article 100 contains definitions which are applicable to ____.
Hazardous (Classified) Locations
Which of the following BEST describes the devices that will help prevent moisture from collecting in raceway systems?
Integral drains
The type of lamp that can be used in a large flexible sheet is a(n) _____.
LED
The type of dimming control used with Wi-Fi is _____.
RF
Electrical equipment rooms or enclosures housing electrical apparatus that are controlled by a lock(s) shall be considered ____ to qualified persons.
accessible
This Code covers the installation of ____ for public and private premises, including buildings, structures, mobile homes, recreational vehicles, and floating buildings.
all of these
Separately installed pressure connectors shall be used with conductors at the ____ not exceeding the ampacity at the listed and identified temperature rating of the connector.
ampacities
The ____ has the responsibility for deciding on the approval of equipment and materials.
authority having jurisdiction
The reduced operation of luminaires near windows when the sun is shining is known as _____.
daylight harvesting
The ____ of any system is the ratio of the maximum demand of a system, or part of a system, to the total connected load of a system.
demand factor
When 60% to 90% of the luminaire's emitted light is directed downward but also 10% to 40% is upward toward the ceiling, this is _____.
direct lighting
When mounted above eye level, which of the following are normally equipped with some bottom shielding, such as a louver or diffuser?
downlights
Lighting that provides the minimum light levels needed to assist people when exiting a building is classified as _____.
egress lighting
Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts is called "____"
enclosed
The NEC is ____.
for the practical safeguarding of persons and property
A branch circuit that supplies only one utilization equipment is a(n) ____ branch circuit.
individual
The best type of occupancy sensor for an office in which occupants sit quietly for long periods is a(n) _____.
infrared sensor
The conductors connected to the direct-current input of an inverter for PV systems form the ____.
inverter input circuit
Ultrasonic occupancy sensors are triggered by _____.
motion
A "service drop" is defined as the overhead conductors between the utility electric supply system and the ____.
service point
Common sources of ignition include electricity, sparking metal, heat-generating equipment, and failed is _____.
wiring splices
Refer to the 2020 edition of the NEC®. The MAXIMUM size dual-element fuse for a 40hp, 3Ø, 460V motor with a Design Letter D is _____.
100A
Overhead service conductors shall have a minimum vertical clearance of ____ ft from final grade over residential property and driveways, as well as over commercial areas not subject to truck traffic where the voltage does not exceed 300 volts-to-ground.
12
Refer to the 2020 edition of the NEC®. What is the total ampacity for a 120V branch circuit consisting of four duplex receptacles rated noncontinuous duty and four duplex receptacles rated continuous duty?
13.5A
Refer to the 2020 edition of the NEC®. What is the required circuit ampacity of a noncontinuous, single-phase load of 8.5kW at 277V?
30.69A
Refer to the 2020 edition of the NEC®. What is the voltage drop for a 120V, single-phase, two-wire branch circuit, 100' long, using copper conductors of 6,530 circular mils with a noncontinuous load of 13A?
5.14V
The square mil area of a conductor that is 0.250" on all sides is _____.
62,500 mils^2
The space immediately beneath a motor fuel dispensing unit at an automotive service station is identified as a _____.
Class I, Division 1 location
A multiwire branch circuit consists of ____.
all of these
In judging equipment for approval, considerations such as ____ shall be evaluated.
all of these
Composite optical fiber cables contain optical fibers and ____.
current-carrying electrical conductors
Where the lighting load of a nondwelling building is designed and constructed to comply with an energy code adopted by the local authority, the lighting load shall be permitted to be calculated using the unit values specified in the _____.
energy code
Connected (connecting) to ground or to a conductive body that extends the ground connection is called "____".
grounded
A "____" is an accommodation that combines living, sleeping. sanitary, and storage facilities within a compartment.
guest room
The type of luminaire that requires regular testing for proper operation is _____.
hazardous location lighting
Lighting that uses fixtures above the visual task area that also contributes to the lighting in the local area is classified as _____.
localized general lighting
The basic measure of the amount of light produced by a light source is called the _____.
lumen
For attics and underfloor spaces, utility rooms, and basements in all occupancies, at least ____ lighting outlet(s) containing a switch or controlled by a wall switch shall be installed where these spaces are used for storage or contain equipment requiring servicing.
one
The color reserved for identifying the high leg of a three-phase, four-wire delta system is _____.
orange
The luminaire with the BEST glare control uses _____.
parabolic louvers
The main purpose of seals or sealoffs in conduit runs is to _____.
prevent the passage of gases, vapors, or flames from one portion of the system to another
The Code does not cover installations under the exclusive control of an electrical utility such as ____.
service drops and laterals
in the NEC, the word(s) "____" indicate a mandatory requirement.
shall or shall not
Working space shall not be used for ____.
storage
Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so ____.
the purpose is evident
Refer to the 2020 edition of the NEC®. Air conditioning overcurrent protective devices can never exceed what percentage of the motor-rated load current or the branch circuit selection current (whichever is greater)?
225%
Refer to the 2020 edition of the NEC®. For resistance welders, the rating for the overcurrent protection device should NOT exceed _____.
300% of the primary current rating of the welder
Refer to the 2020 edition of the NEC®. What is the feeder load (in VA) for the minimum number of small appliance branch circuits required in a residential kitchen?
3000VA
Refer to the 2020 edition of the NEC®. What is the required branch circuit ampacity of a water heater with a nameplate rating of 7,200VA at 240V?
37.5A
At the time of installation, grounded conductors ____ or larger can be identified by distinctive white or gray markings at their terminations.
4 AWG
Refer to the 2020 edition of the NEC®. What is the motor full-load current for an induction type motor with a nameplate rating of 30hp, 460V, 3Ø?
40A
Refer to the 2020 edition of the NEC®. What is the current-carrying capacity for No. 6 THWN aluminum conductors in conduit run through an ambient temperature of 38°C?
44A
In hazardous locations where threaded metal conduit is required, threaded joints must be made up with at least how many threads fully engaged?
5
Anesthetizing locations of hospitals are considered to be Class I, Division 1 locations to a maximum height of _____.
5' above the floor
Refer to the 2020 edition of the NEC®. What is the demand load for one household range with a nameplate rating of 10kW, 240V, 1Ø?
8kW
Refer to the 2020 edition of the NEC®. What is the demand factor for three commercial ranges?
90%
Which of the following are often used in conjunction with time clocks to turn off lighting when it is no longer needed?
Occupancy sensors
Correction factors for reductions due to high ambient temperatures are found in _____.
NEC Tables 310.15(B)(1) and (2)
The classification of an area as being hazardous with regard to the installation of lighting fixtures is the responsibility of the insurance company, authority having jurisdiction, or _____.
owner
Which of the following MUST be considered when determining the size of the conductor required to connect an electrical load to the source of supply?
permissible voltage drop
NFPA 70E, Standard for Electrical Safety in the Workplace, provides guidance, such as determining severity of potential exposure, planning safe work practices, are-flash labeling, and selecting ____
personal protective equipment
Service-entrance and overhead service conductors shall be arranged so that ____ will not enter the service raceway or equipment.
water
An acceptable method of identifying grounded conductors larger than No. 6 AWG is by tagging them or marking them _____.
white
For large equipment that contains service disconnecting means installed in accordance with 230.71 where the combined ampere rating is ____ amprees or more and over 6 ft. wide, there shall be one entrance to and egress from the required working space not less than 24 in. wide and 6 1/2 ft high at each end of the working space.
1200
Refer to the 2020 edition of the NEC®. A sign load CANNOT exceed _____.
80% of the branch circuit rating
Outside feeder tap conductors can be of unlimited length without overcurrent protection at the point they receive their supply if the tap conductors _____.
all of these
The Code contains provisions considered necessary for safety, which will not necessarily result in ____.
all of these
A cobra head luminaire is often used in _____.
roadway lighting
Refer to the 2020 edition of the NEC®. What is the feeder load (in VA) for four small appliance branch circuits?
6000VA
Refer to the 2020 edition of the NEC®. What is the total load required by the NEC® for four appliance branch circuits plus a laundry branch circuit?
7500VA
An incandescent light may be dimmed by _____.
reducing the voltage
If a 20A branch circuit supplies multiple receptacles, the receptacles shall have an ampere rating of no less than ____.
15A
Refer to the 2020 edition of the NEC®. When space heating equipment uses electric resistance heating elements, protection for the resistance elements must NOT exceed _____.
60A
Which of the following locations are hazardous due to the presence of combustible dust?
Class II locations
Refer to the 2020 edition of the NEC®. What is the lighting load on a 120V circuit for six 100W incandescent lights and four fluorescent fixtures with a ballast rating of 1.5A, all operating continuously for 8 hours per day?
13.75A
Refer to the 2020 edition of the NEC®. What is the MINIMUM ampacity for the branch circuit conductors for a single-phase motor rated at 2hp, 230V?
15A
Corridor lighting levels in the public areas of a building should have at least _____.
20% of the illuminance level of the adjacent areas
Refer to the 2020 edition of the NEC®. The total load of show windows must be calculated at NOT less than _____.
200VA per linear foot of show window
To keep the voltage drop of a 277V circuit to a maximum of 3%, what would be the MAXIMUM allowable voltage drop?
8.3V
Refer to the 2020 edition of the NEC®. Continuous loads are calculated at what percentage of the maximum current rating of the overcurrent device?
80%
Refer to the 2020 edition of the NEC®. The demand load for four pieces of commercial cooking equipment is _____.
80%
The physical properties of a No. 4/0 copper conductor would be found in _____.
NEC Chapter 9, Table 8
A luminaire with a 2x3 light distribution pattern is a narrow flood according to _____.
NEMA classifications
Which of the following is approved for use in most Class I, Division 1 locations?
Rigid metal conduit
Overhead service conductors shall have a minimum clearance from final grade of ____ above areas or sidewalks accessible only to pedestrians, measured from final grade or other accessible surface where the voltage does not exceed 150 volts to ground.
10 ft
Refer to the 2020 edition of the NEC®. The load center length for a 208V, four-wire, three-phase branch circuit with fixed noncontinuous loads of 60A at 45' from the source, 40A at 60' from the source, 30A at 75' from the source, and 25A at 100' from the source is _____.
63.55'
A clothing manufacturing plant would MOST likely be classified as is _____.
Class III
As applied to electrical equipment, the term reconditioned may be interchangeable with the term ____.
any of these
The 125 percent multiplier for a continuous load as specified in 210.20(a) ____ included when using the unit loads in table 220.12 for calculating the minimum lighting load for a specified occupancy.
is
Electrical hazards often occur because the initial ____ did not provide for increases in the use of electricity and therefore wiring systems become overloaded.
wiring
