Journeyman Electrician Practice Test
A 440 volts motor has a full load current of 34 amperes. what size disconnecting means is
required? - ANS -40 amperes
The rating of disconnecting means is 115% of full load current.34 * 1.15 = 39.1 amperes.The
nearer rating is 40 amperes.
\A continuous load is load where the maximum current is expected to continue for ............ hours
or more. - ANS -3
\According to the NEC, fixed outdoor deicing and snow melting equipment is to be considered
as a _____ load. - ANS -Continuous
a continuous load is a load expected to continue for three (3) hours or more.The installation
requirements for fixed outdoor electric deicing and snow melting equipment, fixed outdoor
electric deicing and snow melting equipment shall be considered a continuous load.When sizing
conductors and overcurrent protection for the fixed outdoor equipment you must take into
consideration the equipment can operate over 3 hours, so it is considered a continuous load.
\All 15,20 amperes receptacle outlets installed in bathrooms of dwelling units shall always
require ........................................... - ANS -Ground fault circuit interceptor
\Conductors with _____ marked on the insulation are NOT approved for use in a wet location. -
ANS -THHN
conductors with THHN insulation are approved for use in dry and damp locations only and
conductors with THWN, THHW, and THW insulation are recognized for use in dry and wet
locations.
\Flexible cards may not be used in the following locations .......... - ANS -To replace a fixed wiring
of a structure
\For a 300 ampere electrical circuit, what is the minimum size copper equipment grounding
conductor as per NEC? - ANS -4 awg
4 AWG is the minimum size wire for a 300 ampere circuit
\For a building or structure where the meter enclosure is adjacent to the service disconnecting
means, it is permitted to ground the meter enclosure to the _____ conductor on the load side of
the service disconnect if ground-fault protection is not provided. - ANS -Grounded
The meter enclosure to be grounded by connection on the load side of the service disconnect
where (1) no ground-fault protection is installed, (2) the meter enclosure is adjacent to the
service disconnecting means, and (3) the grounded service conductor is not smaller than the
size specified
, \For dwelling units, GFCI protection is required for all single-phase, 125-volt, 15- and 20-ampere
receptacles installed within six (6) feet of the top inside edge of the bowl of sinks located in
_____.
a. laundry rooms
b. bathrooms
c. garages
d. all of these areas - ANS -All of these areas
no matter what the location or room in a dwelling, where the 15- or 20-ampere, 125-volt
eceptacles are installed within six (6) feet from the top inside edge of the bowl of the sink, GFCI
protection must be provided to prevent a ground-fault shock hazard.
\For stationary small motors rated less than .................., the branch circuit over current device
may serve as a controller. - ANS -1/ 8 horse power
\Generally, in a movie theater the manual switch for controlling the emergency lighting systems
is permitted to be located _____. - ANS -in an accessible location in the lobby
apply buildings used as a theater or for a similar purpose. Section 520.8 mandates the control of
emergency systems in theaters to comply with the rules set forth in Article 700; Part V of Article
700 applies to the control of emergency lighting circuits. Section 700.21 does not permit a
manual control switch for emergency lighting to be placed in a motion picture projection booth or
on a stage or platform; the switch shall be located in the lobby or at a convenient accessible
location.Emergency lighting systems are designed and installed to maintain a specific degree of
illumination for means of egress of the building in the event of fire, or similar emergency, or if the
normal power supply fails.
\Given: A one-family dwelling unit with a demand load of 200 amperes is supplied with a
120/240 volt, single-phase, electrical system from the local utility company. What is the
MINIMUM size aluminum THW conductors required for use as service-entrance conductors for
this residence? - ANS -4/0 AWG
one-family dwelling 120/240 volt, single-phase, service-entrance conductors to be sized at an
ampacity of not less than 83% of the service rating. Therefore, 200 amperes x 83% = 166
amperes; size 4/0 AWG THW aluminum conductors with an allowable ampacity of 180 amperes
should be selected for this dwelling.
\If a 230 volts load is connected to 240 volts power source, what is the minimum voltage that
can be supplied to load as recommended by NEC? - ANS -228 volts
\If the panel board rating is 100 amperes, what shall be the over current device rating located in
panel board? - ANS -less than 100 amperes
The over current device rating must not be greater than panel board rating in which it is located
\If two 4 ohm resistors are connected in series which are powered by 240 volts power source,
what is the current flow across one 4 ohm resistor? - ANS -30 amperes
Total resistance of the circuit = 4 + 4 = 8 ohms
A 440 volts motor has a full load current of 34 amperes. what size disconnecting means is
required? - ANS -40 amperes
The rating of disconnecting means is 115% of full load current.34 * 1.15 = 39.1 amperes.The
nearer rating is 40 amperes.
\A continuous load is load where the maximum current is expected to continue for ............ hours
or more. - ANS -3
\According to the NEC, fixed outdoor deicing and snow melting equipment is to be considered
as a _____ load. - ANS -Continuous
a continuous load is a load expected to continue for three (3) hours or more.The installation
requirements for fixed outdoor electric deicing and snow melting equipment, fixed outdoor
electric deicing and snow melting equipment shall be considered a continuous load.When sizing
conductors and overcurrent protection for the fixed outdoor equipment you must take into
consideration the equipment can operate over 3 hours, so it is considered a continuous load.
\All 15,20 amperes receptacle outlets installed in bathrooms of dwelling units shall always
require ........................................... - ANS -Ground fault circuit interceptor
\Conductors with _____ marked on the insulation are NOT approved for use in a wet location. -
ANS -THHN
conductors with THHN insulation are approved for use in dry and damp locations only and
conductors with THWN, THHW, and THW insulation are recognized for use in dry and wet
locations.
\Flexible cards may not be used in the following locations .......... - ANS -To replace a fixed wiring
of a structure
\For a 300 ampere electrical circuit, what is the minimum size copper equipment grounding
conductor as per NEC? - ANS -4 awg
4 AWG is the minimum size wire for a 300 ampere circuit
\For a building or structure where the meter enclosure is adjacent to the service disconnecting
means, it is permitted to ground the meter enclosure to the _____ conductor on the load side of
the service disconnect if ground-fault protection is not provided. - ANS -Grounded
The meter enclosure to be grounded by connection on the load side of the service disconnect
where (1) no ground-fault protection is installed, (2) the meter enclosure is adjacent to the
service disconnecting means, and (3) the grounded service conductor is not smaller than the
size specified
, \For dwelling units, GFCI protection is required for all single-phase, 125-volt, 15- and 20-ampere
receptacles installed within six (6) feet of the top inside edge of the bowl of sinks located in
_____.
a. laundry rooms
b. bathrooms
c. garages
d. all of these areas - ANS -All of these areas
no matter what the location or room in a dwelling, where the 15- or 20-ampere, 125-volt
eceptacles are installed within six (6) feet from the top inside edge of the bowl of the sink, GFCI
protection must be provided to prevent a ground-fault shock hazard.
\For stationary small motors rated less than .................., the branch circuit over current device
may serve as a controller. - ANS -1/ 8 horse power
\Generally, in a movie theater the manual switch for controlling the emergency lighting systems
is permitted to be located _____. - ANS -in an accessible location in the lobby
apply buildings used as a theater or for a similar purpose. Section 520.8 mandates the control of
emergency systems in theaters to comply with the rules set forth in Article 700; Part V of Article
700 applies to the control of emergency lighting circuits. Section 700.21 does not permit a
manual control switch for emergency lighting to be placed in a motion picture projection booth or
on a stage or platform; the switch shall be located in the lobby or at a convenient accessible
location.Emergency lighting systems are designed and installed to maintain a specific degree of
illumination for means of egress of the building in the event of fire, or similar emergency, or if the
normal power supply fails.
\Given: A one-family dwelling unit with a demand load of 200 amperes is supplied with a
120/240 volt, single-phase, electrical system from the local utility company. What is the
MINIMUM size aluminum THW conductors required for use as service-entrance conductors for
this residence? - ANS -4/0 AWG
one-family dwelling 120/240 volt, single-phase, service-entrance conductors to be sized at an
ampacity of not less than 83% of the service rating. Therefore, 200 amperes x 83% = 166
amperes; size 4/0 AWG THW aluminum conductors with an allowable ampacity of 180 amperes
should be selected for this dwelling.
\If a 230 volts load is connected to 240 volts power source, what is the minimum voltage that
can be supplied to load as recommended by NEC? - ANS -228 volts
\If the panel board rating is 100 amperes, what shall be the over current device rating located in
panel board? - ANS -less than 100 amperes
The over current device rating must not be greater than panel board rating in which it is located
\If two 4 ohm resistors are connected in series which are powered by 240 volts power source,
what is the current flow across one 4 ohm resistor? - ANS -30 amperes
Total resistance of the circuit = 4 + 4 = 8 ohms
