Practice test PSI
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
When the disconnecting means of a transformer is located remotely it must be
lockable.
What is the maximum depth that can be excavated below the bottom members of an excavation support system?
24 inches
Dry-type transformers rated over which voltage shall be installed in a vault?
35,000 volts
Disregarding exceptions, what is the minimum size copper-clad aluminum underground service conductor permitted?
6 AwG
What is the maximum number of 12 AWG conductors that can be used in a 4" x 1-1/2" square box?
9
In which application is the installation of UF cable permitted?
in photovoltaic systems
How many quarter bends are allowed in IMT between pull points?
4
Disregarding exceptions, liquidtight flexible metal conduit shall be supported and secured at intervals not to exceed
4 1/2 feet.
All employees must receive working in open pits that are greater than how training on working in confined and enclosed spaces when many feet in depth?
4 feet
A panelboard for a mobile home shall be rated not less than which of the following?
50 amperes
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 amperes or less.
Disregarding exceptions, what is the minimum size copper-clad aluminum underground service conductor permitted?
6 AWG
ENT shall not be
threaded.
What is the greatest root-mean-square (effective) difference of potential between any two conductors of a circuit defined as?
voltage
Unless otherwise provided, MC cables shall be secured at intervals not exceeding which of the following?
6 feet
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 feet
What is the power of a 4-ohm resistive load connected to a 120-volt power supply?
120v/4ohm=3OA 30X120V= 3600w
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 flying objects, or from electrical shock and burns?
Employer
Which type of conduit is not permitted to be used to install underground service conductors?
FMC
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
A minimum of how many threads needs to be engaged if machine screws are used to fastern bonding jumpers?
2
Disregarding exceptions, conductors used for direct burial applications shall be shielded if rated above which of the following?
2,000 volts
Snap switches directly connected to aluminum conductors shall be listed and marked CO/ALR if rated at
20 amperes or less.
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 maximum weight of a luminaire that can be supported by the screw shell of a lampholder?
6 pounds
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
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
What must circuit breakers used as switches in high-intensity discharge lighting circuits be marked as?
HID
What is the formula for calculating power (watts)?
R x I 2
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%
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
A continuous load is a load where the maximum current is expected to continue for at least how long?
3 hours
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
What is the minimum rating for a standard lampholder that shall be used for circuits and equipment operating at less than 50 volts?
660 watts
One horsepower is equal to how many watts?
746
Temporary electric power and lighting installations for holiday decorative lighting shall be permitted for a period not to exceed how many days?
90 days
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
What part of a bulk storage plant is classified as Class 2, Zone 2?
drainage ditches, separators, and impounding basins
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
A fitting is a part of a wiring system that is intended primarily to perform which type of function?
mechanical
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.
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"
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 %
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?
10 feet
EMT shall be securely fastened in place at intervals NOT to exceed which of the following?
10 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
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
Which conductor has a maximum overcurrent protection of 10 amperes?
16 AWG
Where the rated input current the autotransformer is less than 9 amperes, what is the maximum permitted overcurrent device rating?
167% of the input current
What is the minimum fire rating for electrical vaults housing electrical equipment over 600 volts, nominal?
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 required width of the working space in front of electrical equipment with a 22-inch width?
30 inches
Approximately how many kilowatts are used by a three-phase, 480- voit ac motor that draws a current of 52 amperes and has a power factor rating of 88 %
480v x 52a x 1.735= 43180W x .88= 38000w
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 minimum size copper conductor permitted for use for a 6,000 volt service?
6 AWG
When installed in the same cable tray, cables operating at over 600 volts shall be of which type?
MC
What is the maximum spacing for supports of 10 AWG copper conductors located in a vertical raceway?
100 feet
Overcurrent protection for feeders 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%
In a power-limited fire alarm circuit, transformers supplied from power-supply conductors shall be protected by an overcurrent device rated not over
20 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.
A resistor has the following colored bands (in order): orange, red, brown, silver. What is the resistor value?
320 Ohms (10% tolerance)
For other than a totally enclosed switchboard or switchgear, what is the minimum amount of space that shall be provided between the top of the unshielded switchboard or switchgear and any combustible ceiling?
36"
What is the recommended maximum total voltage drop on both feeders and branch circuits to the farthest outlet?
5%
What is the minimum size copper equipment grounding wire for a 150 amp feeder?
6 AWG
What is the minimum size copper-clad aluminum equipment grounding conductor for a feeder with a 100-ampere overcurrent protection device?
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
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
Disregarding exceptions, overcurrent devices shall be readily accessible and shall be installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than how high above the floor or working platform?
6 feet, 7 inches
What is the minimum clearance required between recessed fluorescent luminaires installed in the ceiling of a clothes closet and the nearest point of closet storage space?
6 inches
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
outlet for a 12 AWG conductor with a listed outlet branch-circuit type arc-fault circuit interrupter installed at the first outlet What is the maximum permitted length of the branch-circuit wiring from the branch-circuit overcurrent device to the first box?
70 feet
The conductors, including splices and taps, shall not fill the wireway to more than what percentage of its area?
75%
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
