Journeymen
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 in
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
An appliance for a residence is rated at 30 amperes. It is continuously loaded and is not motor-operated. What is the minimum branch circuit rating that is required if the branch circuit device is not listed for continuous loading?
40 amperes
A panelboard for a mobile home shall be rated not less than which of the following?
50 amperes
Infrared lamp commercial and industrial heating appliances shall have overcurrent protection NOT exceeding which of the following?
50 amperes
Photovoltaic storage batteries for dwellings shall have the cells connected so as to operate at what maximum voltage?
50 volts, nominal
Disregarding exceptions, what is the minimum size copper-clad aluminum underground service conductor permitted?
6 AWG
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
What is the minimum size copper equipment grounding wire for a 150 amp feeder?
6 AWG
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 metal underground water pipe used as a grounding electrode shall be in direct contact with the earth for a minimum of how many feet?
10ft
A written emergency action plan is required for all employers with how many employees?
11 employees or more
What is the ampere load of a 3-hp single-phase motor at 240 volts with an efficentcy rating of 83%?
11.23 amperes
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
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 ft
What is the maximum weight of a luminaire that can be supported by the screw shell of a lampholder?
6 pounds
How many amperes does a 3-hp, 240-volt, 3-phase motor draw if the motor has values of 90% efficiency and 95% power factor?
6.3 amperes
Resistance-type heating elements in electric space-heating equipment shall be protected at not more than how many amperes?
60 amperes
The ampacity of the conductors from the generator terminals to the first distribution device(s) containing overcurrent protection shall not be less than what percentage of the nameplate current rating?
115%
What clearance must be maintained when overhead spans of open conductors or open multiconductor cables of not over 1,000 volts, nominal, pass over residential property?
12 ft
Conductors that supply a single motor used in a continuous duty application shall have an ampacity of not less than what percentage of the motor full-load current rating?
125%
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%
Where a feeder supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum feeder conductor size shall have an allowable ampacity not less than the noncontinuous load plus what percentage of the continuous load?
125%
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 amperes
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
Two 12 AWG stranded uncoated copper conductors are run 100 feet; the current through the circuit is 20 amperes. What is the power loss of the conductors?
158 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 current
In a fire alarm system, single conductors shall not be smaller than
18 AWG
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
Disregarding exceptions, conductors used for direct burial applications shall be shielded if rated above which of the following?
2,000 volts
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 amperes or less.
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
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?
1,000 volts or less
A motor controller disconnecting means shall be permitted to be out of sight of the controller for motor circuits over how many volts?
1,000 volts, nominal
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 in
EMT shall be securely fastened in place at intervals NOT to exceed which of the following?
10 feet
A resistor has the following colored bands (in order): orange, red, brown, silver. What is the resistor value?
320 Ohms (10% tolerance)
A continuous load is a load where the maximum current is expected to continue for at least how long?
3 hours
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 ac systems of 480 volts to 1,000 volts
What is the maximum overcurrent protection for a 10 AWG copper conductor?
30 amperes
For permanently connected appliances, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means for appliances rated at not over
300 volt-amperes or 1/8 hp.
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%
A circuit breaker does not have an interrupter rating shown on it. What is the interrupter rating of this circuit breaker?
5,000 amperes
Lifelines for fall protection shall have a minimum breaking strength of how many pounds?
5,400
Rod-type grounding electrodes of stainless steel shall have a diameter of not less than which of the following?
5/8 inch
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 ft
One horsepower is equal to how many watts?
746
The conductors, including splices and taps, shall not fill the wireway to more than what percentage of its area?
75%
How far shall the work space extend from the grade, floor, or platform for equipment that is 60 inches in height?
78 in
What is the minimum size solid conductor permitted to be installed in a raceway?
8 AWG
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
A 3-hp pump is installed 220 feet from the 220-volt main service. What is the voltage drop when using 12 AWG solid wire?
8.8 volts
The following measurements are taken on a 3-phase load: power used is 11,250 watts, 208 volts applied, and current is 35 amperes per phase leg. What is the power factor of the load?
89%
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
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 amperes
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
When installed in the same cable tray, cables operating at over 600 volts shall be of which type?
MC
Which type of service-entrance conductors can be contained in a cable tray?
MI Cable
What is the formula for calculating power (watts)?
R x I2
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
Which type of service-entrance cable has a flame-resistant and moisture resistant covering?
Type SE
Type MI conductors shall NOT be composed of which material?
aluminum
A system that is connected to establish electrical continuity and conductivity is considered to be which of the following?
bonded
In which locations are the installation of flexible metal conduit permitted?
concealed locations
What part of a bulk storage plant is classified as Class 2, Zone 2?
drainage ditches, separators, and impounding basins
Who is responsible for providing head protective gear to employees who are working in areas where there is a possible danger of head injury from impact, falling or flying objects, or from electrical shock and burns?
employer
Unlisted nonconductive outside plant optical fiber cables shall not be permitted to be installed in which type of raceways?
flexible metal conduit
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
In which application is the installation of NM cable permitted?
in Type III construction
Where is AC cable NOT permitted to be used?
in damp locations
Where are flat cable assemblies permitted to be installed?
in exposed locations
Power distribution blocks installed in boxes shall be
listed
When the disconnecting means of a transformer is located remotely it must be
lockable
A fitting is a part of a wiring system that is intended primarily to perform which type of function?
mechanical
Where an electrical vault is required or specified for conductors and equipment operating at over 600 volts, nominal, the floor when in contact directly with earth shall be constructed in what manner?
minimum of 4-inch-thick concrete
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
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
What is the greatest root-mean-square (effective) difference of potential between any two conductors of a circuit defined as?
voltage