Practice test PSI
CORRECT 100%
The service disconnecting means may be installed in all of the following EXCEPT - ANSWER the
bathroom.
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. - ANSWER 1 inch
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? - ANSWER 125%
A continuous load is a load where the maximum current is expected to continue for at least how long? -
ANSWER 3 hours
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? - ANSWER 115%
ENT shall not be - ANSWER threaded.
A panelboard for a mobile home shall be rated not less than which of the following? - ANSWER 50
amperes
Disregarding exceptions, liquidtight flexible metal conduit shall be supported and secured at intervals not
to exceed - ANSWER 4 1/2 feet.
,What is the maximum weight of a luminaire that can be supported by the screw shell of a lampholder? -
ANSWER 6 pounds
Disregarding exceptions, what is the minimum size copper-clad aluminum underground service
conductor permitted? - ANSWER 6 AwG
The base of a 24-foot non-self-supporting ladder shall be placed approximately how far from the vertical
structure upon which is leaning? - ANSWER 6 feet
A resistor has the following colored bands (in order): orange, red, brown, silver. What is the resistor
value? - ANSWER 320 Ohms (10% tolerance)
What is the formula for calculating power (watts)? - ANSWER R x I 2
One horsepower is equal to how many watts? - ANSWER 746
A continuous load is a load where the maximum current is expected to continue for at least how long? -
ANSWER 3 hours
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? - ANSWER 36"
What is the required width of the working space in front of electrical equipment with a 22-inch width? -
ANSWER 30 inches
What is the minimum fire rating for electrical vaults housing electrical equipment over 600 volts,
nominal? - ANSWER 3 hours
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? - ANSWER 1.5 %
, 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? - ANSWER 3 feet
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? - ANSWER 125%
What is the recommended maximum total voltage drop on both feeders and branch circuits to the
farthest outlet? - ANSWER 5%
Temporary electric power and lighting installations for holiday decorative lighting shall be permitted for a
period not to exceed how many days? - ANSWER 90 days
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? - ANSWER 6 feet
Which type of conduit is not permitted to be used to install underground service conductors? - ANSWER
FMC
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? - ANSWER 12 feet
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 - ANSWER 55
amperes or less.
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? - ANSWER
black
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? - ANSWER 70 feet
CORRECT 100%
The service disconnecting means may be installed in all of the following EXCEPT - ANSWER the
bathroom.
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. - ANSWER 1 inch
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? - ANSWER 125%
A continuous load is a load where the maximum current is expected to continue for at least how long? -
ANSWER 3 hours
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? - ANSWER 115%
ENT shall not be - ANSWER threaded.
A panelboard for a mobile home shall be rated not less than which of the following? - ANSWER 50
amperes
Disregarding exceptions, liquidtight flexible metal conduit shall be supported and secured at intervals not
to exceed - ANSWER 4 1/2 feet.
,What is the maximum weight of a luminaire that can be supported by the screw shell of a lampholder? -
ANSWER 6 pounds
Disregarding exceptions, what is the minimum size copper-clad aluminum underground service
conductor permitted? - ANSWER 6 AwG
The base of a 24-foot non-self-supporting ladder shall be placed approximately how far from the vertical
structure upon which is leaning? - ANSWER 6 feet
A resistor has the following colored bands (in order): orange, red, brown, silver. What is the resistor
value? - ANSWER 320 Ohms (10% tolerance)
What is the formula for calculating power (watts)? - ANSWER R x I 2
One horsepower is equal to how many watts? - ANSWER 746
A continuous load is a load where the maximum current is expected to continue for at least how long? -
ANSWER 3 hours
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? - ANSWER 36"
What is the required width of the working space in front of electrical equipment with a 22-inch width? -
ANSWER 30 inches
What is the minimum fire rating for electrical vaults housing electrical equipment over 600 volts,
nominal? - ANSWER 3 hours
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? - ANSWER 1.5 %
, 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? - ANSWER 3 feet
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? - ANSWER 125%
What is the recommended maximum total voltage drop on both feeders and branch circuits to the
farthest outlet? - ANSWER 5%
Temporary electric power and lighting installations for holiday decorative lighting shall be permitted for a
period not to exceed how many days? - ANSWER 90 days
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? - ANSWER 6 feet
Which type of conduit is not permitted to be used to install underground service conductors? - ANSWER
FMC
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? - ANSWER 12 feet
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 - ANSWER 55
amperes or less.
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? - ANSWER
black
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? - ANSWER 70 feet
