Exam (elaborations)
YEAR 1 FINAL (128-135) IEC END OF SEM EXAM WITH ALL ANSWERS
YEAR 1 FINAL (128-135) IEC END OF SEM EXAM WITH ALL ANSWERS
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year 1 final 128 135 iec end of sem exam with al
when loads such as lamps motors and heaters are
two 20 amp circuits with a shared neutral are fed
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IEC
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4. Exam (elaborations) - Year 1 final (128-135) iec end of sem exam with all answers
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YEAR 1 FINAL (128-135) IEC END OF SEM EXAM WITH ALL
ANSWERS
Whenvloadsvsuchvasvlamps,vmotors,vandvheatersvarevconnectedvtovonevcircuitvofvavmulti
wirevbranchvcircuit,vthesevloadsvarevconnectedvinv___.v-vcorrectvanswer-parallel
Twov20-ampvcircuitsvwithvavsharedvneutralvarevfedvfromvav120/240-
volt,v1Øvpanel.vIfvthevungroundedvcircuitvconductorsvarevconnectedvtovbreakersv1vandv2,
vwhichvofvthevfollowingvwillvhappenvwhenvav16-
ampvloadvisvconnectedvtovCircuitv1vandvav14-ampvloadvisvconnectedvtovCircuitv2?v-
vcorrectvanswer-Thevgroundedv(neutral)vconductorvwillvbevoverloaded.
Circuitsv7vandv9vsharevavneutral.vThisvisvavmultiwirevbranchvcircuit.vIfvCkt.v7visvdrawingv13
vampsvandvCkt.v9visvdrawingv16vamps,vhowvmuchvcurrentvisvflowingvinvthevneutral?v-
vcorrectvanswer-3
Whatvisvthevresultvifvthevneutralvwirevbecomesvopenvonvavmultiwirevcircuitvhavingvunequa
lvloads?v-vcorrectvanswer-
Thevloadvofvhighervresistancevwouldvoverheatvandvprobablyvbevdamaged
Voltmetersvarevconnectedvinv___vwithvthevloadvwhenvusedvtovmeasurevvoltagevacrossvav
loadvinvavcircuit.v-vcorrectvanswer-parallel
Avmultiwirevbranchvcircuitvfromvav120/240-voltv1Ø,v3-
wirevpanelboardvwillvbevusedvtovsupplyvpowervtovavdoublevsingle-polevswitch.
ThevNEC®vrequiresvthatvavmultiwirevbranchvcircuitvsupplyingvmorevthanvonevdevicevorve
quipmentvonvthevsamevyokevhavevavmeansvtovsimultaneouslyvdisconnectvallvungrounde
dvconductorsvatvthevpanelboardvwherevthevbranchvcircuitvoriginated.vThisvmeansvthatv__
_vcanvbevusedvtovdisconnectvthevcircuitsvfromvthevreceptacle.v-vcorrectvanswer-onevtwo-
polevcircuitvbreaker
Invanvofficevbuilding,vCircuitv22vsuppliesvthevuppervhalfvandvCircuitv24vsuppliesvthevlower
vhalfvofvavduplexvreceptacle.vThesevbreakersvarevpermitted vtovbev___.v
I.vtwovindividualvsingle-polevcircuitvbreakersv
II.vtwovindividualvsingle-polevcircuitvbreakersvwithvhandlevties
, III.vavtwo-polevcircuitvbreakerv-vcorrectvanswer-IIvorvIIIvonly
ThevCodevreferencevthatvspecifiesvthevtypevofvdisconnectingvmeansv(circuitvbreakervforv
example)vthatvcanvbevusedvonvavmultiwirevbranchvcircuitvthatvfeedsvdevicesvmountedvonv
thevsamevyokev[avstackvswitchvorvavduplexvreceptaclevforvexample]visv___.Note:vSelectv
N/Av(vnotvapplicable)vifvtherevisvnotvanvNEC®vrequirement.v-vcorrectvanswer-240.15(B)
(1)
MultiwirevbranchvcircuitvLA-2,4visvinstalledvusingv14-
3vACvcablevtovsupplyvpowervtovtwovreceptacles.vThev14-
3vcableventersvthevfirstvreceptaclevboxvthenv14-
2vcablevexitsvthisvboxvandvcontinuesvtovthevsecondvreceptaclevbox.vThevNEC®vpermitsvt
hevtwovgroundedvconductorsvthatventervandvexitvthevfirstvboxvtovbev___.v
I.vdirectlyvconnectedvtovthevterminalvscrewsvonvthevreceptacle
II.vconnectedvtogethervwithvavwirevnutvandvavpigtailvfromvtherevtovthevreceptaclevterminalv
screwv-vcorrectvanswer-IIvonly
Thevbatteryvcompartmentvinvanvoffshorevservicevboatvcontainsvtenv18-
voltvbatteriesvtovoperatevavsmallvcranevthatvrequiresv90vvoltsvtovoperate.vThevtenvbatterie
svarevconnectedvinv___.v-vcorrectvanswer-combovseries/parallel
Whatvisvthevminimumvnumbervofvreceptaclesvrequiredvinvanvunfinishedvbasement?v-
vcorrectvanswer-1
Tradevsizev___visvthevminimumvsizevRMCv(rigidvmetalvconduit)vthatvcanvcontainvsixveach
v8vAWGvcoppervTHHN/THWNvconductors.v-vcorrectvanswer-3/4
Racewaysv___vrequiredvtovbevcompletelyvinstalledvbetweenvboxesvbeforevpullingvinvthev
wires.v-vcorrectvanswer-are
AvpiecevofvFMCv(flexiblevmetalvconduit)vmustvbevatvleastvavtradevsizev___vwherevtwelvev
eachv8vAWGvTHHN/THWNvconductorsvarevtovbevinstalled.v-vcorrectvanswer-1v1/4
Tradevsizev___visvthevminimumvsizevSchedulev40vPVCv(rigidvpolyvinylvchloridevconduit)v
thatvcanvcontainvthirteenveachv8vAWGvcoppervTHHN/THWNvconductors.v-
vcorrectvanswer-1v1/4
Thevnumbervofvconductorsvpermittedvinv80vPVCvisvspecifiedvinvTablev___.v-
vcorrectvanswer-C.10,vAnnexvC
Whichvofvthesevtradevsizev1/2vinchvracewaysvhasvthevsmallestvinsidevdiameter?
vRefervtovthevappropriatevtablevamongvthosevshownvinvNEC®vChapterv9v-vTablev4.v-
vcorrectvanswer-Electrical vNonmetallicvTubing
WhatvpartvofvthevNEC®visvavreferencevforvcalculatingvconduitvfillvwherevallvconductorsvar
evthevsamevsize?v-vcorrectvanswer-AnnexvC
WhatvisvthevminimumvtradevsizevEMTvrequiredvtovcontainvthreev1/0vAWGvTHHN/
THWNvcoppervconductors?v-vcorrectvanswer-1v1/4