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Science Engineering
Journeyman Electrician Practice Test
Electrical Engineering
Journeyman Electrician Practice Test
S
Conductors with _____ marked on the insulation are NOT THHN
approved for use in a wet location.
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.
Given: A one-family dwelling unit with a demand load of 4/0 AWG
200 amperes is supplied with a 120/240 volt, single-
phase, electrical system from the local utility company. one-family dwelling 120/240 volt, single-phase, service-entrance
conductors to What is the MINIMUM size aluminum THW conductors be sized at an ampacity of not less than 83% of the service
rating. Therefore, required for use as service-entrance conductors for this
200 amperes x 83% = 166 amperes; size 4/0 AWG THW aluminum conductors residence? with an allowable ampacity of 180 amperes
should be selected for this dwelling.
Where a 150 kVA, single-phase transformer having a 625 amperes
secondary voltage of 120/240 is installed at a multi-
family dwelling, the full-load current rating, in amperes, To find the full-load current rating of the single-phase
transformer apply the of the secondary is _____. single-phase current formula as shown:I = (150 kVA x 1000) / 240 volts =
15,000/240 = 625 amperes
Which one of the following listed circuit breakers is 75 amperes
NOT a standard ampere rating?
the standard ampere ratings for fuses and circuit breakers. A
circuit breaker with an ampere rating of 75 amperes is not a
standard ampere rating.
The MINIMUM length of free conductor to be left at 6 inches
each junction box for the purpose of splicing
conductors, or making connections to illuminares or free conductor is to be left at each junction box for splices or the
connection devices shall be _____. of luminaires or devices. The intent of this rule is to ensure enough conductor slack
for the terminal connections or splices to be made easily.
4/30/26, 1:31 PM Journeyman Electrician Practice Test
In general, overhead service-drop conductors shall 8 AWG copper NOT
be smaller than _____.
overhead service-drop conductors to be not smaller than 8 AWG copper or
6 AWG aluminum or copper-clad aluminum. Do not get service-drop
conductors, the overhead conductors between the utility electric supply
system and the service point, confused with the service-entrance
conductors, the conductors from the service point from the utility
company to the service disconnecting means.
When a galvanized eye-bolt is to be used as the point 10 ft.
of attachment for an electrical service, the NEC
requires the eye-bolt to be installed NOT less than _____ provide adequate vertical clearance of the conductors and prevent
physical above finished grade. damage to the conductors and prevent persons from making accidental contact with the conductors
which may create a shock hazard or electrocution.
In no case shall the point of attachment of the service-drop
conductors to be less than 10 ft. above finished grade.
Why is electrical continuity required for metallic To establish an effective ground-fault path and facilitate the operation
of the conduit? over-current protective device.
Electrical continuity is required for metallic conduit to establish
an effective ground-fault path and facilitate the operation of the
overcurrent protective device.
In dwelling units, receptacle outlets installed for 20 inches
countertop surfaces, must be located above, but NOT
more than _____ above the countertop or work surface. receptacle outlets installed for countertop or work surfaces in dwelling
units may be located on or above, but not more than 20 in. above the countertop or work surface. The intent of this rule is to
eliminate the use of unsightly extension cords (which reduces the amount of usable countertop space) on the countertop or work
surface to supply cord-and-plug connected appliances.
Also, receptacles located more than 20 inches above countertops or
work surfaces may interfere with the cabinetry to be installed.
When conductors are installed in a conduit or tubing 24 inches
nipple of _____ or less in length, the ampacity adjustment
factors for more than three (3) current-carrying adjustment factors for more than three (3) current-carrying conductors in
conductors in the raceway, are not required to be raceways shall not apply where the raceway is not more than 24 inches in
applied.
length. Where more than 3 current-carrying conductors are installed in short lengths of conduit or tubing, the heating effect
caused from the additional conductors is insignificant therefore, the allowable ampacity of the conductors is not greatly
reduced.
In compliance with the NEC, the total marked rating of 50%
a 120-volt, cord-and-plug-connected room air
conditioner shall not exceed _____ of the rating of a the special provisions for room air conditioners which are (1) rated not
over branch circuit when lighting units, general-use 250-volts ac, single-phase and (2) which are cord-and-attachment plug
receptacles, or other appliances are supplied from the
connected. In order to prevent overloading the branch circuit, as per Section branch circuit. 40.62(C), the total rating of
the A/C unit shall not exceed 50% of the rating of a branch circuit where lighting units, general-use receptacles or
appliances are also supplied.
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4/30/26, 1:31 PM Journeyman Electrician Practice Test
Generally, in a movie theater the manual switch for in an accessible location in the lobby
controlling the emergency lighting systems is permitted
to be located _____. 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.
Single-conductor cable such as _____ and single-USE- 2
conductor cable listed and identified as solar
photovoltaic (PV) wire are permitted for use in PV 690 covers the wiring methods specified for use on solar photovoltaic
(PV) source circuits within the PV array. systems arrays.
indicates open, single-conductors such as Type USE-2 and single-
conductor cable listed and identified as PV wire are permitted foruse in
PV source circuits within the PV array.
These conductors are evaluated and listed for use where exposed to
sunlight and wet conditions.
For dwelling units, GFCI protection is required for all All of these areas
single-phase, 125-volt, 15- and 20-ampere receptacles
installed within six (6) feet of the top inside edge of the no matter what the location or room in a dwelling, where the 15-
or 20-ampere, bowl of sinks located in _____. 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-a. laundry rooms fault shock hazard.
b. bathrooms
c. garages
d. all of these
areas
For a building or structure where the meter enclosure is Grounded
adjacent to the service disconnecting means, it is
permitted to ground the meter enclosure to the _____ The meter enclosure to be grounded by connection on the load side of
the conductor on the load side of the service disconnect if service disconnect where (1) no ground-fault protection is
installed, (2) the ground-fault protection is not provided.
meter enclosure is adjacent to the service disconnecting means, and (3) the grounded service conductor is not smaller than
the size specified
In a dwelling unit where a 125-volt, 15- or 20-ampere Both AFCI and GFCI protection
receptacle is located under the counter for an in-sink
waste disposer, the receptacle must be provided with Because of the presence of water and grounded surfaces that contributes
to a _____. potential shock hazard
a. AFCI protection only any 125-volt, 15- or 20-ampere receptacle installed within six (6) feet of a sink is b. GFCI
protection only required to be GFCI protected. Section 210.12(A) verifies AFCI protection is c. both AFCI and GFCI protection
required for all 120-volt, 15- or 20-ampere branch-circuits that supply outlets in d. neither AFCI nor GFCI protection
kitchens in dwellings.AFCI devices are designed to determine resistance to unwanted tripping due to the presence of arcing
that occurs in utilization equipment under normal operating conditions or to a loading condition that closely mimics an arcing
fault.
4/30/26, 1:31 PM Journeyman Electrician Practice Test
Where a 125-volt, 15-ampere receptacle is connected to 12 amperes
a 120-volt branch circuit supplying two (2) or more
receptacles or outlets, the maximum permitted cord-the general rules regarding branch circuits. Branch circuit and receptacle
and-plug-connected load to the receptacle is _____. ratings are addressed in Part II of Article 210. To prevent overheating
receptacles, a receptacle shall not supply a total cord-and-plug-connected load in excess of the maximum specified in Table
21(B)(2), where connected to a branch circuit supplying multiple receptables or other outlets. This table shows a 15-ampere
rated receptacle may carry a maximum cord-and-plug-connected load of 12 amperes under this condition.
In industrial establishments only, when a 200-ampere 50 ft
rated busway is tapped from a 600-ampere rated
busway, what is the maximum permitted length of the the permitted installation of busways. For busways in industrial
establishments 200 - ampere busway where overcurrent protection is only, providing overcurrent protection at the point where
the busway size is not provided for the 200-ampere busway?
changed is not required if the busway having the smaller ampacity does not exceed fifty (50) feet in length and has an
ampacity of at least one-third the rating of the overcurrent protection of the larger usway. 1/3 of 600 amperes = 200
amperes
When installing nonmetallic sheathed cable enclosed in Is
prohibited an underground buried PVC conduit, the cable _____.
he inside of all raceways and enclosures located underground is classified as a a. must be Type NMC wet location. The
conductors and cables installed in underground installations b. must be Type NMS must be of a type listed for use in wet
locations.Restrictions of the use of non-c. must be Type NMW metallic sheathedccablec
d.ciscprohibitedc
NMCciscpermittedcincdry,cmoist,candcdampclocations,cbutcwetclocationscarecnotcincludedcincthisclist.
AccordingctocthecNEC,cfixedcoutdoorcdeicingcandcsnowcContinuousc
meltingcequipmentcisctocbecconsideredcascac_____cload.
accontinuouscloadciscacloadcexpectedctoccontinuecforcthreec(3)chourscorc
more.Thecinstallationcrequirementscforcfixedcoutdoorcelectriccdeicingcandcsnowcm
eltingcequipment,cfixedcoutdoorcelectriccdeicingcandcsnowcmeltingc
equipmentcshallcbecconsideredcaccontinuouscload.Whencsizingcconductorscandcoverc
urrentcprotectioncforcthecfixedcoutdoorcequipmentcyoucmustctakecintocconsideratio
ncthecequipmentccancoperatecoverc 3 chours,csocitciscconsideredcaccontinuouscload.
Incregardctocaccommercialcbuilding,cwherecacservice- 92 camperersc
entrancecconduitchavingcaclengthcofcsixc(6)cfeetccontainsc
fourc(4)csizec 2 cAWGcTHWNcinsulatedccopperccurrent-
Tocsolvecthiscproblemcfirstclocatecthecconductorcsize,andclookcunderctheccopperccarryingcconductors,ceachcofcthecconductorschavecancTHWNccolumncwi
thcactemperaturecratingcofc75°Ccandcnotecthecampacitycofcthecallowablecampacitycofc_____.c
conductorscisc 115 camperes.cThectableciscbasedconcancambientctemperaturecofc86°Ccandcnotcmorecthanc 3 ccurrent-carryingcconductorscincthecraceway.
incthiscsituationctherecarec 4 ccurrent-carryingcconductorscincthecracewayc
therefore,cwecmustcapplyctheccorrectcadjustmentcfactorc(deratingcvalue)
2 cAWGcTHWNcampacityc=c 115 camperesc(beforecderating)115camperescxc80%c(adjustme
ntcfactor)c=c 92 camperes
WhatcmaterialcshouldcnotcbecusedcforcGroundingcAluminum
electrodes.
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4/30/26,c1:31cPM JourneymancElectriciancPracticecTestccccc
UndergroundcwiringcshallcbecinstalledcincwhichcofcthecAllcoptionscareccorrectcfollowingc
conduit
a.)Threadedcrigidcmetalc
b.)Threadedcstealcintermediatecmetalc
c.)Allcoptionscareccorrectc
.)PVC
Whatciscthecresistancecofc 80 cwattcLightcbulbcratedcatc 120 c 180 cohms
volts?
Whencbranchccircuitscusedcatcoutside,cthecsizecofcNOc 10
overheadcconductorscforc 600 cvoltscorcless,cforcspans
uptoc 50 cfeet,cshallcnotcbeclesscthanc.............ccopper.cForcCoppercitciscNO.10forcaluminumcitciscNOc 8
Allc15,20camperescreceptaclecoutletscinstalledcincGroundcfaultccircuitcinterceptorcbathroomsc
ofcdwellingcunitscshallcalwayscrequirec
Ifcthecpanelcboardcratingcisc 100 camperes,cwhatcshallcbeclesscthanc 100 camperescthecoverccu
rrentcdevicecratingclocatedcincpanelcboard?
Thecoverccurrentcdevicecratingcmustcnotcbecgreatercthancpanelcboardcratingcincwhic
hcitcisclocated
Ifcac 230 cvoltscloadciscconnectedctoc 240 cvoltscpowerc 228 cvoltsc
source,cwhatciscthecminimumcvoltagecthatccancbec
suppliedctocloadcascrecommendedcbycNEC?
Whencthecsinglecphasecaircconditionercratingcisclesscthanc 40 camperesc......
....catc 240 cvoltsccancbecconsideredcascsinglecmotorc
unitcincdeterminingcbranchccircuitcconditions.
WhatcisctheclowcvoltageccontactclimitcforcsinusoidalcAC?c 15 cVoltscRMS
FlexibleccardscmaycnotcbecusedcincthecfollowingcTocreplacecacfixedcwiringcofcacstructure
locationsc..........
Whatciscthecminimumcpercentagecratedcvoltagecthatcac 87 c1/2c%
storagecbatterycshouldcsupplycthecemergencycload?
Thecverticallycruncmetalcwire-wayscshallcbecsurelyc 15 c
supportedcatcintervalscnotcexceedingc.............cftcofcwirec
waycandcshallcnotchavecmorecthanconecjointcbetweenc
supports.
ThecinteriorcofcanycdipctankccancbecconsideredcascClass1,cDivision
...................clocation
Shouldcungroundedcductscorcconduitscshouldcbecsealedcyes,ctocpreventcunwantedcgasescentrycincbuildings
beforecenteringcbuildings?
Accontinuouscloadciscloadcwherecthecmaximumccurrentc 3
iscexpectedctoccontinuecforc............chourscorcmore.
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