1QUESTIONS WITH CORRECT
ANSWERS 2025/2026
-AcorrectAanswersThereAareAmoreAthanAthreeAcurrent-
carryingAconductorsAinAaAracewayAperANECASectionA310.15(B)(3)
VoltageAdropAruleAofAthumbA(A)A-
AcorrectAanswersVDAforAfeedersAshouldAnotAexceedA3%AtoAtheAfarthestAoutletAandA5%AforAtheAc
omboAofAfeedersAandAbranchAcircuitsAtoAtheAfarthestAoutlet.
VoltageADropAruleAofAthumbA(B)A-
AcorrectAanswersWhenAcombined,AtheAmaxAVDAallowedAforAtheAbranchAcircuitAisAusuallyA3%,Ath
enAVDAallowedAforAfeederAcanAbeAnoAmoreAthanA2%.
WhatAareAtheAformulasAtoAcalculateAVDAforAsingle-phaseAcircuitsAwithAresistiveAloads?A-
AcorrectAanswersVDA=A2xLxRxI/1,000AandAVDA=A2xLxKxI/CM
CMA-AcorrectAanswersAreaAofAtheAconductorAinAcircularAmils
ContinuousAdutyAloadA-
AcorrectAanswersAAloadAthatAoperatesAwithoutAinterruptionAforAmoreAthanA3AhoursAstraight
WhatAisAtheAadjustedAampacityAforAeachAofAsixANo.A4/0ATHHNAcopperAcurrent-
carryingAconductorsAinAaAsingleAconduit?A-
AcorrectAanswersSeeANECATableA310.15(B)(16)AforAampacityAandANECATableA310.15(B)(3)(a)Afor
AadjustedAampacityAbyA80%
1.732A-AcorrectAanswersTheAsquareArootAofA3
VDA=AsquareArootA3xLxRxI/1,000A-AcorrectAanswersFormulaAforAVDAofAaAthree-
phaseAfeederAwithAaAnoncontinuousAload
I=AVA/VAxAsquareArootAofA3AorAIA=AVA/VAxA1.732A-AcorrectAanswersFormulaAforAbalancedAthree-
phaseAcircuitAfeederAampacity
WhenAtheAovercurrentAprotectionAforAaAconductorAisAlocatedAatAtheAloadAendAinsteadAofAatAthe
AsupplyAsideAofAaAconductorA-AcorrectAanswersNECAgenerallyAconsidersAtoAbeAaAtrap
ThereAisAnoAovercurrentAdeviceAwithinAtheAtransformerAitselfA-
AcorrectAanswersWhyAareAalmostAallAsecondaryAsidesAofAtransformersAclassifiedAasAtrapAcondu
ctors?
TheA100'A(30Am)AtapAruleANECASectionA240.21(B)(4)A-
AcorrectAanswersLimitedAtoAinstallationsAinAaAhighAbayAmanufacturingAbuildingAwithAwallAheigh
tsAoverA35'A(11Am)