Journeyman Electrician Practice Test
Questions And Answers
Conductors hwith h_____ hmarked hon hthe hinsulation hare hNOT happroved hfor huse hin ha hwet hlocation. h-
hAnswer h- hTHHN
conductors hwith hTHHN hinsulation hare happroved hfor huse hin hdry hand hdamp hlocations honly hand
hconductors hwith hTHWN, hTHHW, hand hTHW hinsulation hare hrecognized hfor huse hin hdry hand hwet hlocations.
Given: hA hone-family hdwelling hunit hwith ha hdemand hload hof h200 hamperes his hsupplied hwith ha h120/240
hvolt, hsingle-phase, helectrical hsystem hfrom hthe hlocal hutility hcompany. hWhat his hthe hMINIMUM hsize
haluminum hTHW hconductors hrequired hfor huse has hservice-entrance hconductors hfor hthis hresidence? h-
hAnswer h- h4/0 hAWG
one-family hdwelling h120/240 hvolt, hsingle-phase, hservice-entrance hconductors hto hbe hsized hat han
hampacity hof hnot hless hthan h83% hof hthe hservice hrating. hTherefore, h200 hamperes hx h83% h= h166 hamperes;
hsize h4/0 hAWG hTHW haluminum hconductors hwith han hallowable hampacity hof h180 hamperes hshould hbe
hselected hfor hthis hdwelling.
Where ha h150 hkVA, hsingle-phase htransformer hhaving ha hsecondary hvoltage hof h120/240 his hinstalled hat ha
hmulti-family hdwelling, hthe hfull-load hcurrent hrating, hin hamperes, hof hthe hsecondary his h_____. h- hAnswer h-
h625 hamperes
To hfind hthe hfull-load hcurrent hrating hof hthe hsingle-phase htransformer happly hthe hsingle-phase hcurrent
hformula has hshown:I h= h(150 hkVA hx h1000) h/ h240 hvolts h= h15,000/240 h= h625 hamperes
Which hone hof hthe hfollowing hlisted hcircuit hbreakers his hNOT ha hstandard hampere hrating? h- hAnswer h- h75
hamperes
the hstandard hampere hratings hfor hfuses hand hcircuit hbreakers. hA hcircuit hbreaker hwith han hampere hrating
hof h75 hamperes his hnot ha hstandard hampere hrating.
The hMINIMUM hlength hof hfree hconductor hto hbe hleft hat heach hjunction hbox hfor hthe hpurpose hof hsplicing
hconductors, hor hmaking hconnections hto hilluminares hor hdevices hshall hbe h_____ h. h- hAnswer h- h6 hinches
, free hconductor his hto hbe hleft hat heach hjunction hbox hfor hsplices hor hthe hconnection hof hluminaires hor
hdevices. hThe hintent hof hthis hrule his hto hensure henough hconductor hslack hfor hthe hterminal hconnections hor
hsplices hto hbe hmade heasily.
In hgeneral, hoverhead hservice-drop hconductors hshall hNOT hbe hsmaller hthan h_____. h- hAnswer h- h8 hAWG
hcopper
overhead hservice-drop hconductors hto hbe hnot hsmaller hthan h8 hAWG hcopper hor h6 hAWG haluminum hor
hcopper-clad haluminum. hDo hnot hget hservice-drop hconductors, hthe hoverhead hconductors hbetween hthe
hutility helectric hsupply hsystem hand hthe hservice hpoint, hconfused hwith hthe hservice-entrance hconductors,
hthe hconductors hfrom hthe hservice hpoint hfrom hthe hutility hcompany hto hthe hservice hdisconnecting hmeans.
When ha hgalvanized heye-bolt his hto hbe hused has hthe hpoint hof hattachment hfor han helectrical hservice, hthe
hNEC hrequires hthe heye-bolt hto hbe hinstalled hNOT hless hthan h_____ habove hfinished hgrade. h- hAnswer h- h10
hft.
provide hadequate hvertical hclearance hof hthe hconductors hand hprevent hphysical hdamage hto hthe
hconductors hand hprevent hpersons hfrom hmaking haccidental hcontact hwith hthe hconductors hwhich hmay
hcreate ha hshock hhazard hor helectrocution. hIn hno hcase hshall hthe hpoint hof hattachment hof hthe hservice-drop
hconductors hto hbe hless hthan h10 hft. habove hfinished hgrade.
Why his helectrical hcontinuity hrequired hfor hmetallic hconduit? h- hAnswer h- hTo hestablish han heffective
hground-fault hpath hand hfacilitate hthe hoperation hof hthe hover-current hprotective hdevice.
Electrical hcontinuity his hrequired hfor hmetallic hconduit hto hestablish han heffective hground-fault hpath hand
hfacilitate hthe hoperation hof hthe hovercurrent hprotective hdevice.
In hdwelling hunits, hreceptacle houtlets hinstalled hfor hcountertop hsurfaces, hmust hbe hlocated habove, hbut
hNOT hmore hthan h_____ habove hthe hcountertop hor hwork hsurface. h- hAnswer h- h20 hinches
receptacle houtlets hinstalled hfor hcountertop hor hwork hsurfaces hin hdwelling hunits hmay hbe hlocated hon hor
habove, hbut hnot hmore hthan h20 hin. habove hthe hcountertop hor hwork hsurface. hThe hintent hof hthis hrule his hto
heliminate hthe huse hof hunsightly hextension hcords h(which hreduces hthe hamount hof husable hcountertop
hspace) hon hthe hcountertop hor hwork hsurface hto hsupply hcord-and-plug hconnected happliances. hAlso,
hreceptacles hlocated hmore hthan h20 hinches habove hcountertops hor hwork hsurfaces hmay hinterfere hwith hthe
hcabinetry hto hbe hinstalled.
When hconductors hare hinstalled hin ha hconduit hor htubing hnipple hof h_____ hor hless hin hlength, hthe hampacity
hadjustment hfactors hfor hmore hthan hthree h(3) hcurrent-carrying hconductors hin hthe hraceway, hare hnot
hrequired hto hbe happlied. h- hAnswer h- h24 hinches
Questions And Answers
Conductors hwith h_____ hmarked hon hthe hinsulation hare hNOT happroved hfor huse hin ha hwet hlocation. h-
hAnswer h- hTHHN
conductors hwith hTHHN hinsulation hare happroved hfor huse hin hdry hand hdamp hlocations honly hand
hconductors hwith hTHWN, hTHHW, hand hTHW hinsulation hare hrecognized hfor huse hin hdry hand hwet hlocations.
Given: hA hone-family hdwelling hunit hwith ha hdemand hload hof h200 hamperes his hsupplied hwith ha h120/240
hvolt, hsingle-phase, helectrical hsystem hfrom hthe hlocal hutility hcompany. hWhat his hthe hMINIMUM hsize
haluminum hTHW hconductors hrequired hfor huse has hservice-entrance hconductors hfor hthis hresidence? h-
hAnswer h- h4/0 hAWG
one-family hdwelling h120/240 hvolt, hsingle-phase, hservice-entrance hconductors hto hbe hsized hat han
hampacity hof hnot hless hthan h83% hof hthe hservice hrating. hTherefore, h200 hamperes hx h83% h= h166 hamperes;
hsize h4/0 hAWG hTHW haluminum hconductors hwith han hallowable hampacity hof h180 hamperes hshould hbe
hselected hfor hthis hdwelling.
Where ha h150 hkVA, hsingle-phase htransformer hhaving ha hsecondary hvoltage hof h120/240 his hinstalled hat ha
hmulti-family hdwelling, hthe hfull-load hcurrent hrating, hin hamperes, hof hthe hsecondary his h_____. h- hAnswer h-
h625 hamperes
To hfind hthe hfull-load hcurrent hrating hof hthe hsingle-phase htransformer happly hthe hsingle-phase hcurrent
hformula has hshown:I h= h(150 hkVA hx h1000) h/ h240 hvolts h= h15,000/240 h= h625 hamperes
Which hone hof hthe hfollowing hlisted hcircuit hbreakers his hNOT ha hstandard hampere hrating? h- hAnswer h- h75
hamperes
the hstandard hampere hratings hfor hfuses hand hcircuit hbreakers. hA hcircuit hbreaker hwith han hampere hrating
hof h75 hamperes his hnot ha hstandard hampere hrating.
The hMINIMUM hlength hof hfree hconductor hto hbe hleft hat heach hjunction hbox hfor hthe hpurpose hof hsplicing
hconductors, hor hmaking hconnections hto hilluminares hor hdevices hshall hbe h_____ h. h- hAnswer h- h6 hinches
, free hconductor his hto hbe hleft hat heach hjunction hbox hfor hsplices hor hthe hconnection hof hluminaires hor
hdevices. hThe hintent hof hthis hrule his hto hensure henough hconductor hslack hfor hthe hterminal hconnections hor
hsplices hto hbe hmade heasily.
In hgeneral, hoverhead hservice-drop hconductors hshall hNOT hbe hsmaller hthan h_____. h- hAnswer h- h8 hAWG
hcopper
overhead hservice-drop hconductors hto hbe hnot hsmaller hthan h8 hAWG hcopper hor h6 hAWG haluminum hor
hcopper-clad haluminum. hDo hnot hget hservice-drop hconductors, hthe hoverhead hconductors hbetween hthe
hutility helectric hsupply hsystem hand hthe hservice hpoint, hconfused hwith hthe hservice-entrance hconductors,
hthe hconductors hfrom hthe hservice hpoint hfrom hthe hutility hcompany hto hthe hservice hdisconnecting hmeans.
When ha hgalvanized heye-bolt his hto hbe hused has hthe hpoint hof hattachment hfor han helectrical hservice, hthe
hNEC hrequires hthe heye-bolt hto hbe hinstalled hNOT hless hthan h_____ habove hfinished hgrade. h- hAnswer h- h10
hft.
provide hadequate hvertical hclearance hof hthe hconductors hand hprevent hphysical hdamage hto hthe
hconductors hand hprevent hpersons hfrom hmaking haccidental hcontact hwith hthe hconductors hwhich hmay
hcreate ha hshock hhazard hor helectrocution. hIn hno hcase hshall hthe hpoint hof hattachment hof hthe hservice-drop
hconductors hto hbe hless hthan h10 hft. habove hfinished hgrade.
Why his helectrical hcontinuity hrequired hfor hmetallic hconduit? h- hAnswer h- hTo hestablish han heffective
hground-fault hpath hand hfacilitate hthe hoperation hof hthe hover-current hprotective hdevice.
Electrical hcontinuity his hrequired hfor hmetallic hconduit hto hestablish han heffective hground-fault hpath hand
hfacilitate hthe hoperation hof hthe hovercurrent hprotective hdevice.
In hdwelling hunits, hreceptacle houtlets hinstalled hfor hcountertop hsurfaces, hmust hbe hlocated habove, hbut
hNOT hmore hthan h_____ habove hthe hcountertop hor hwork hsurface. h- hAnswer h- h20 hinches
receptacle houtlets hinstalled hfor hcountertop hor hwork hsurfaces hin hdwelling hunits hmay hbe hlocated hon hor
habove, hbut hnot hmore hthan h20 hin. habove hthe hcountertop hor hwork hsurface. hThe hintent hof hthis hrule his hto
heliminate hthe huse hof hunsightly hextension hcords h(which hreduces hthe hamount hof husable hcountertop
hspace) hon hthe hcountertop hor hwork hsurface hto hsupply hcord-and-plug hconnected happliances. hAlso,
hreceptacles hlocated hmore hthan h20 hinches habove hcountertops hor hwork hsurfaces hmay hinterfere hwith hthe
hcabinetry hto hbe hinstalled.
When hconductors hare hinstalled hin ha hconduit hor htubing hnipple hof h_____ hor hless hin hlength, hthe hampacity
hadjustment hfactors hfor hmore hthan hthree h(3) hcurrent-carrying hconductors hin hthe hraceway, hare hnot
hrequired hto hbe happlied. h- hAnswer h- h24 hinches
