Testing
Disregarding exceptions, what is the minimum size copper-clad aluminum underground service conductor permitted?
# 6 awg
What is the minimum size solid conductor permitted to be installed in a raceway?
# 8
Dry-type transformers rated over which voltage shall be installed in a vault?
35,000 volts
For other than a totally enclosed switchboard or switchgear, what is the minimum amount of space that shall be provided between the top of an unshielded switchboard or switchgear and any combustible ceiling?
36 inches
Approximately how many kilowatts are used by a three-phase, 480-volt ac motor that draws a current of 52 amperes and has a power factor rating of 88%?
38 kW
How many quarter bends are allowed in IMT between pull points?
4
All employees must receive training on working in confined and enclosed spaces when working in open pits that are greater than how many feet in depth?
4 feet
A motor with a code letter of D shall have what range of kilowatt-amperes per horsepower with locked rotor?
4.00 to 4.49
The combined cross-sectional area of all conductors or cables shall not exceed what percentage of the interior cross sectional area of the underfloor raceway?
40%
A panelboard for a mobile home shall be rated not less than which of the following?
50 amps
Photovoltaic storage batteries for dwellings shall have the cells connected so as to operate at what maximum voltage?
50 volts nominal
Live parts of generators shall not be exposed to accidental contact where accessible to unqualified operated persons if their voltage is greater than which of the following?
50 volts to ground
A circuit breaker does not have an interrupter rating shown on it. What is the interrupter rating of this circuit breaker?
5000 amp
The feeder conductor ampacity shall not be less than that of the service conductors where the feeder conductors carry the total load supplied by service conductors with an ampacity of
55 amps or less
The nameplate on a nonmotor generator arc welder shows the primary current is 60 amperes with a duty rating of 80%. What is the minimum allowable AWG size copper conductor with TW insulation?
6 awg
What is the minimum size copper conductor permitted for use for a 6,000 volt service?
6 awg
The portion of a grounding electrode conductor in a dc system that is connected to a rod or pipe shall NOT be required to be larger than which of the following?
6 awg copper
If installed and routed on the outside of a raceway, the length of the equipment bonding jumper shall not exceed how many feet?
6 feet
What is the maximum distance that the emergency controls for an attended self-service motor fuel dispensing facility shall be located from the dispensers?
100 feet
What is the maximum spacing for supports of 10 AWG copper conductors located in a vertical raceway?
100 feet
A motor controller disconnecting means shall be permitted to be out of sight of the controller for motor circuits over how many volts?
1000 volts nominal
Where an ac system is grounded at any point, the grounded conductors shall be routed with the ungrounded conductors to each service disconnecting means and shall be connected to each disconnecting means grounded conductors terminal or bus for an ac system operating at how many volts?
1000 volts or less
A written emergency action plan is required for all employers with how many employees?
11 employees or more
Receptacles in residential units shall be installed such that no point measured horizontally along the floor line of any wall space is more than how far from a receptacle outlet?
6 feet
The base of a 24-foot non-self-supporting ladder shall be placed approximately how far from the vertical structure upon which is leaning?
6 feet
Unless otherwise provided, MC cables shall be secured at intervals not exceeding which of the following?
6 feet
What is the maximum weight of a luminaire that can be supported by the screw shell of a lampholder?
6 pounds
Resistance-type heating elements in electric space-heating equipment shall be protected at not more than how many amperes?
60 amps
What is the minimum size overhead conductor that can be used for festoon lighting that is not supported by messenger wires?
12 awg
Overcurrent protection for feeders and branch circuits supplying electric vehicle supply equipment shall be sized for continuous duty and shall have a rating of not less than what percentage of the maximum load of the electric vehicle supply equipment?
125%
If the branch circuit supplies a single non-motor-operated appliance, the rating of overcurrent protection shall not exceed 20 amperes if the overcurrent protection rating is not marked and the appliance is rated at
13.3 amps
What is the minimum size grounding equipment conductor required for a photovoltaic system?
14 awg
Receptacles used for circuits and equipment operating at less than 50 volts shall have a minimum rating of how many amperes?
15 amps
Information technology equipment shall be permitted to be connected to a branch circuit by a power-supply cord with a maximum length of how many feet?
15 feet
Plug fuses shall be permitted to be used in circuits supplied by a system having a grounded neutral point where the line-to-neutral voltage does NOT exceed which of the following?
150 Volts
Alternating-current systems of less than 50 volts shall be grounded where supplied by transformers, if the transformer supply system exceeds which of the following?
150 volts to ground
What is the approximate power loss for a conductor in a 208-volt circuit that has a 5% voltage drop with a current flow of 15 amperes?
156 watts
Where the rated input current of the autotransformer is less than 9 amperes, what is the maximum permitted overcurrent device rating?
167% of the input
In a fire alarm system, single conductors shall not be smaller than
18 awg
Equipment grounding conductors of bare or insulated aluminum or copper-clad aluminum shall not be terminated within how many inches of the earth?
18 inches
What is the motor nameplate FLA rating for a 5 hp single-phase motor, 230 volt with an efficiency rating of 95% and a power factor of 90%?
19 amps
When intermediate members (such as balusters or additional rails) are used on scaffolding, they shall NOT be more than how many inches apart?
19 inches
What is the minimum size of the aluminum equipment grounding conductor where the overcurrent protection ahead of a branch circuit or feeder is sized at 600 amperes?
2/0
Snap switches directly connected to aluminum conductors shall be listed and marked CO/ALR if rated at
20 amps or less
Disregarding exceptions, conductors used for direct burial applications shall be shielded if rated above which of the following?
2000 volts
A resistor has the following colored bands (in order): orange, red, brown, silver. What is the resistor value?
320 Ohms (10% tolerance)
In which locations are the installation of flexible metal conduit permitted?
Concealed location
In which application is red brass rigid metal conduit permitted?
Direct burial
Unlisted nonconductive outside plant optical fiber cables shall not be permitted to be installed in which type of raceways?
FMC
Which type of conduit is not permitted to be used to install underground service conductors?
FMC
Where a main bonding jumper or a system bonding jumper is a screw only, the screw shall be identified with which color finish?
Green
Which is best defined as an unintentional, electrically conductive connection between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth?
Ground fault
Where is AC cable NOT permitted to be used?
In damp location
Where are flat cable assemblies permitted to be installed?
In exposed locations
In which application is the installation of UF cable permitted?
In photovoltaic systems
What is an askarel?
a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating means
Lamp tie wires, mounting screws, clips, and decorative bands on glass shall not be required to be grounded if spaced at least how far from the lamp terminals?
1 1/2 inches
What is the minimum size EMT conduit required for three 14 AWG, six 12 AWG, and three 8 AWG conductors? All wires are THHN solid wire.
1 inch
What is the maximum voltage drop for any branch circuit, separately derived system, operating at 120 volts line-to-line and 60 volts to ground, serving sensitive electronic equipment?
1.5%
Signs and outline lighting system equipment for wet location use, other than listed watertight type, shall be weatherproof and have drain holes not larger than
1/2 inch
Where metallic plugs or plates are used with nonmetallic enclosures, how far shall they be recessed from the outer surface of the enclosure?
1/4"
Service conductors installed as open conductors or multiconductor cable without an overall outer jacket shall have a minimum clearance of how many feet from porches and balconies?
3 feet
High-impedance grounded neutral systems in which a grounding impedance limits the ground fault current to a low value shall be permitted for which type of system?
3 phase system from 480 volts to 1000 volts
What is the maximum overcurrent protection for a 10 AWG copper conductor?
30 amps
What is the minimum permitted branch circuit overcurrent protection for a 240-volt, 5,000-watt, 60-gallon water heater?
30 amps
What is the required width of the working space in front of electrical equipment with a 22-inch width?
30 inches
For permanently connected appliances, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means for appliances rated at not over
300volt amps and 1/8 HP
Multiple nonmotor generator arc welders are being served by a branch panel. There are two 120-amperes welders with a 70% duty cycle, one 90-amperes welder with a 80% duty cycle, and one 250-amperes welder with a 50% duty cycle. What is the minimum disconnect for this branch panel?
450 amps
The length of the pull box shall not be less than how many times the outside diameter, over sheath, of the largest shielded or lead-covered conductor or cable entering the box?
48 times
For pool equipment, the disconnecting means for all ungrounded conductors shall be readily accessible and within sight from its equipment and shall be located a minimum of how many feet horizontally from the inside walls of a pool?
5 feet
What is the recommended maximum total voltage drop on both feeders and branch circuits to the farthest outlet?
5%
Lifelines for fall protection shall have a minimum breaking strength of how many pounds?
5,400 pounds
Rod-type grounding electrodes of stainless steel shall have a diameter of not less than which of the following?
5/8
The resistance of a 1,000 watt toaster oven is 12 ohms and the resistance of a 850 watt coffee pot is 15 ohms. The appliances are connected in parallel. What is the total resistance of the two appliances?
7 ohms
What is the maximum permitted length of the branch-circuit wiring from the branch-circuit overcurrent device to the first outlet for a 12 AWG conductor with a listed outlet branch-circuit type arc-fault circuit interrupter installed at the first outlet boX?
70 Feet
One horsepower is equal to how many watts?
746 watts
The conductors, including splices and taps, shall not fill the wireway to more than what percentage of its area?
75%
Excluding exceptions, communications wires shall have a vertical clearance of not less than how many feet from all points of roofs above which they pass?
8 feet
An appliance draws 40 amperes when used on a circuit. A bad splice is discovered on the line at the appliance on one of the phase conductors. The splice has a measured resistance of 0.5 ohms. How much power is lost at the splice?
800 watts
What is the maximum number of 12 AWG conductors that can be used in a 4" x 1-1/2" square box?
9
Temporary electric power and lighting installations for holiday decorative lighting shall be permitted for a period not to exceed how many days?
90 days
What is the permissible noise exposure limit for an 8-hour day that, if exceeded, requires hearing protection to be provided?
90 dba
The storage batteries used as a source of power for emergency systems shall be of suitable rating and capacity to supply and maintain the total load for a minimum of how long?
90 minutes
A feeder supplies a continuous lighting load of 45 amperes and a single motor load of 30 amperes. What is the ampere rating of the feeder?
94 amps
Where the negative polarity of a dc system does not serve as the connection point for the grounded conductor, which color finish can be used to identify the negative ungrounded conductor?
Black
A system that is connected to establish electrical continuity and conductivity is considered to be which of the following?
Bonded
When the disconnecting means of a transformer is located remotely it must be
Lockable
When installed in the same cable tray, cables operating at over 600 volts shall be of which type?
MC
A fitting is a part of a wiring system that is intended primarily to perform which type of function?
Mechanical
What is the formula for calculating power (watts)?
R x I2
For electric space heating cables, which color of lead wire is used to indicate a circuit voltage of 240 volt, nominal?
Red
Where the positive polarity of a dc system does not serve as the connection for the grounded conductor, which color finish can be used to identify the positive ungrounded conductor?
Red
Use of a higher class motor overload relay may preclude the need for which of the following?
Selection of a higher trip current
When combination surface metallic raceways are used for both signaling and for lighting and power circuits, the different systems shall be run in separate compartments. Which is NOT an acceptable means of identifying by the interior finish of the different systems?
Tagging
The service disconnecting means may be installed in all of the following EXCEPT
The bathroom
Which type of surge protection device is permanently connected and intended for installation between the secondary of the service transformer and the line side of the service disconnect overcurrent device?
Type 1
In which application is the installation of NM cable permitted?
Type 3 construction
Which type of service-entrance cable has a flame-resistant and moisture resistant covering?
Type SE
What is the greatest root-mean-square (effective) difference of potential between any two conductors of a circuit defined as?
Voltage
What part of a bulk storage plant is classified as Class 2, Zone 2?
drainage ditches, separators, and impounding basins