Verified, not estimated. Every figure below is drawn from the official exam structure we maintain — question counts, passing standard and topic weighting. Practice questions are grounded in the source law with statute citations. We omit any figure we can't verify rather than guess at it.
Total questions
75
Passing score
70%
Exam time
180 min
Administered by
Prov
Format
Reference materials allowed
West Virginia State Portion
75 questions
Motors & Controls5 Q · 7%
Motor branch-circuit conductor sizing and ampacity requirements (NEC Article 430)Branch-circuit short-circuit and ground-fault protection ratings and settings for motorsMotor overload protection selection and sizingMotor controller types, ratings, and enclosure classificationsMotor disconnecting means requirements and locationAC motor types, characteristics, and NEMA design classificationsDC motor types, speed control methods, and starting requirementsAir-conditioning and refrigerating equipment (hermetic refrigerant motor-compressor) wiring and protection requirements
Equipment for General Use6 Q · 8%
Flexible cord and cable types, ratings, and permitted usesLuminaire installation requirements and location restrictionsSwitchboards, switchgear, and panelboard installation and busbar arrangementTransformer installation, overcurrent protection, and vault requirementsFixed electric space-heating equipment: disconnecting means and overcurrent protectionReceptacle ratings, grounding types, GFCI/AFCI protection, and tamper-resistance requirementsSwitch types, ratings, connections, and installation requirementsGenerator installation, overcurrent protection, and conductor ampacity
Special Occupancies2 Q · 3%
Hazardous location classification — Class I, II, and III Divisions and Zone systemsWiring methods and equipment protection techniques for hazardous classified locationsConduit and cable sealing requirements in Class I and Class II locationsHealth care facility essential electrical systems — life safety, critical, and equipment branchesPatient care space wiring, grounding, bonding, and receptacle requirementsSpecial occupancy wiring requirements — commercial garages, aircraft hangars, motor fuel dispensing facilities, and bulk storage plantsMobile homes, manufactured homes, recreational vehicles, and park trailers — electrical supply and wiringTheaters, assembly occupancies, carnivals, and motion picture/TV studios — wiring methods and portable equipment
Special Equipment4 Q · 5%
Swimming pools, spas, and hot tubs: GFCI/SPGFCI protection, bonding, and underwater luminaire requirementsSolar photovoltaic (PV) systems: circuit sizing, maximum voltage, overcurrent protection, rapid shutdown, and disconnecting meansElectric vehicle power transfer system (EVSE): branch circuits, overcurrent protection, personnel protection, and disconnecting meansElevators, escalators, and similar equipment: wiring methods, branch circuits, disconnecting means, and GFCI requirementsCranes and hoists: contact conductors, wiring methods, conductor ampacity, and disconnecting meansFire pumps: power sources, continuity of power, overcurrent protection, and supply conductor requirementsElectric signs and outline lighting: branch circuits, disconnecting means, grounding and bonding, and transformer requirementsElectric welders: supply conductor ampacity, overcurrent protection, and duty cycle calculations
Special Conditions4 Q · 5%
Emergency systems: wiring requirements, circuit identification, and separation from other wiring (Article 700)Legally required standby systems: power sources, transfer equipment, and selective coordination (Article 701)Critical operations power systems (COPS): risk assessment, feeder wiring, fire protection, and cybersecurity (Article 708)Interconnected electric power production sources: parallel operation, load-side connections, and overcurrent protection (Article 705)Energy storage systems: disconnecting means, overcurrent protection, and installation requirements (Article 706)Fire alarm systems: NPLFA and PLFA circuit wiring methods, power sources, cable types, and separation requirements (Article 760)Class 1, Class 2, Class 3, and Class 4 power-limited circuit wiring methods, conductor sizing, and separation from other circuits (Articles 724–726)Fire-resistive cable systems and circuit integrity (CI) cables: listing, installation, and survivability requirements (Articles 728, 722)
Wiring Methods & Materials20 Q · 27%
Conductor types, insulation designations, and temperature ratings (Article 310 Table 310.4)Conduit and raceway selection, uses permitted and not permitted (RMC, IMC, EMT, PVC, FMC, LFMC, ENT, RTRC, HDPE)Cable assembly types and permitted applications (NM, NMC, MC, AC, MI, UF, SE/USE, TC, MV)Box and enclosure requirements: fill calculations, sizing, and installation (Article 314, 312)Conductor fill, conduit fill, and cable pulling requirementsSecuring, supporting, and protection of wiring methods against physical damage (spacing, stapling, bending radius)Specialty raceway systems: wireways, busways, cable trays, underfloor and cellular floor raceways, surface racewaysMedium voltage and high-voltage wiring requirements (Articles 305, 315, over 1000V)
Communication Systems3 Q · 4%
Cable listing requirements and fire-resistance ratings by location (plenum, riser, general-purpose, limited-use)Grounding and bonding of communications cables, primary protectors, and intersystem bonding terminationsSeparation requirements between communications cables and electric light/power conductorsPrimary protector requirements and placement for communications circuitsOverhead and underground communications cable installation requirements entering buildingsOptical fiber cable types, construction, and NEC conductive/nonconductive classificationsCATV coaxial cable grounding, bonding, and cable substitution hierarchyNetwork-powered broadband communications system power classifications and installation methods
General Electrical Knowledge12 Q · 16%
Ohm's Law and fundamental electrical quantities (voltage, current, resistance, power)Series, parallel, and combination circuit types and calculationsAC and DC electrical systems and standard voltages/frequenciesConductor ampacity, sizing, and temperature ratings per NEC tablesVoltage drop calculations and allowable limitsLoad calculations for branch circuits, feeders, and panelsElectrical safety-related work practices and personal protective equipment (PPE)NEC definitions, scope, and code arrangement
Plan Reading2 Q · 3%
Electrical symbols and notation used on construction drawingsSingle-line and riser diagrams for distribution systemsLoad calculations and demand factors from plan specificationsPanel schedules and circuit identification on drawingsWiring methods and raceway types as shown on plansConductor ampacity tables and sizing from design tablesMotor and equipment nameplate data interpretation on plansLighting layout and outlet spacing requirements from commercial plansDefinitions
Wiring & Protection17 Q · 23%
Branch-circuit ratings, conductor sizing, and permissible loadsFeeder sizing, overcurrent protection, and load calculationsService entrance conductors, equipment, and disconnecting meansGrounding electrode system types, installation, and bonding requirementsEquipment grounding conductors and bonding jumpersGFCI and AFCI protection requirements by location and occupancyOvercurrent protective devices: fuses and circuit breakers (types, ratings, and applications)Surge-protective devices and overvoltage protection requirements
Key Distinctions
Ambient basis of general-wiring ampacity tables (30°C)vsAmbient basis of medium voltage cable in air (40°C)
Tables 310.16 and 310.17 are based on a 30°C ambient, while per 315.60(E) ampacity tables for MV cable conductors in air are based on a 40°C ambient air temperature.
The 30°C-based table is used with Table 310.16 and Table 310.17, while the 40°C-based table is used with Tables 310.18, 310.19, 310.20, and 310.21 as required.
NEC 2023 Table 310.15(B)(1)(2) Note
Raceway-supported enclosure without devices [314.23(E)]vsRaceway-supported enclosure with devices or supporting luminaires [314.23(F)]
An enclosure containing no devices other than splicing devices and supporting no luminaire shall not exceed 1650 cm³ (100 in.³) with each supporting conduit secured within 900 mm (3 ft) (450 mm/18 in. if all entries are on the same side), whereas an enclosure containing a device other than a splicing device or supporting a luminaire must have each conduit threaded wrenchtight and secured within 450 mm (18 in.).
For straight pulls with 4 AWG or larger conductors the box length shall not be less than 8 times the trade size of the largest raceway, while for angle pulls the distance to the opposite wall shall not be less than 6 times the trade size of the largest raceway in the row plus the sum of the trade sizes of the other raceways in that same row and wall.
NEC 2023 Section 314.28(A)(1)
Motor control conductors extending beyond the control equipment enclosurevsMotor control conductors not extending beyond the enclosure
Per 430.72(B)(2) Table Note 3, copper control conductors larger than 10 AWG that leave the motor control equipment enclosure limit the motor branch-circuit short-circuit/ground-fault device to not more than 300 percent of the 60°C ampacity, while Note 2 permits 400 percent where the conductors do not extend beyond the enclosure.
NEC 2023 Section 430.72(B)(2)
General-use switch as disconnect for stationary motors 2 hp or less, not over 300 VvsMotor-circuit switch / other motor percentages
A general-use switch used as the disconnect for a stationary motor of 2 hp or less at not more than 300 V must be rated at least 200 percent of motor full-load current, whereas 115 percent is the continuous rating required of a motor-circuit switch, 125 percent applies to branch-circuit conductor sizing and typical overload selection, and 150 percent is the limit for the separate branch-circuit fuse or inverse-time breaker in the compensator case.
American Electricians' Handbook, 17th ed., Sec. 383 (Motor switches), item 2
Hermetic motor-compressor OCPD at the standard 175 percentvsHermetic motor-compressor OCPD increased to 225 percent
440.22(A) normally limits the branch-circuit short-circuit and ground-fault device to 175 percent of the rated-load current (or branch-circuit selection current where marked), and only where that device will not carry the starting current may the rating be increased to not more than 225 percent.
NEC 2023 Section 440.32 and 440.22(A)
Single receptaclevsMultiple receptacle
Article 100 defines a single receptacle as a single contact device with no other contact device on the same yoke or strap, while a multiple receptacle is two or more contact devices on the same yoke or strap; the supplying circuit and the box do not determine the classification.
NEC 2023 Article 100 — Definitions of Receptacle and Receptacle Outlet
BuswayvsCable tray system, lighting track, and multioutlet assembly
Article 100 defines a busway as a raceway consisting of a metal enclosure with factory-mounted bare or insulated conductors, whereas a cable tray system is a structural support system, lighting track is an assembly that supports and energizes luminaires, and a multioutlet assembly contains a raceway but is not itself defined as one.
NEC 2023 Article 100 — Definitions of Raceway, Busway, Cable Tray System, Lighting Track, and Multioutlet Assembly
Type THHW / Type XHHW (dual-rated)vsType THWN, TW, and THHN
THHW and XHHW carry 90°C in dry (and damp) locations but only 75°C in wet locations, while THWN is 75°C in both wet and dry, TW is a 60°C moisture-resistant thermoplastic, and THHN is not moisture-resistant and is limited to dry and damp locations at 90°C.
NEC 2023 Table 310.4(1)
FMC and LFNC fastening at terminations (300 mm / 12 in.)vsEMT fastening at terminations (900 mm / 3 ft)
FMC must be securely fastened within 300 mm (12 in.) of each box, cabinet, conduit body or other termination, and LFNC in lengths exceeding 1.8 m (6 ft) within 300 mm (12 in.) of each box and at intervals not exceeding 900 mm (3 ft), while EMT is fastened within 900 mm (3 ft) of each termination and at intervals not exceeding 3 m (10 ft).
NEC 2023 Section 348.30(A)
Outlet/branch-circuit AFCI home run on a 15-A circuitvsOutlet/branch-circuit AFCI home run on a 20-A circuit
Where an outlet/branch-circuit-type AFCI at the first outlet provides the required protection on a Type NM-wired circuit (wiring continuous to that outlet and box marked as first outlet), the home run is limited to 50 ft for 15-A circuits and 70 ft for 20-A circuits; the limit does not apply if the home run is metal-enclosed or a branch/feeder AFCI breaker originates the circuit.
Service (utility supply)vsSeparately derived system (on-site power production facility)
A service consists of the conductors and equipment delivering energy from the serving utility, and only a utility supply creates a service; a supply from an on-site power production facility is a separately derived system whose local distribution originates at a building disconnect rather than service equipment.
American Electricians' Handbook, 17th ed., Page 3.6
Standard ampere ratings for fuses onlyvsStandard ampere ratings for both fuses and inverse time circuit breakers
Per 240.6(A), 1, 3, 6, and 601 amperes are additional standard ratings for fuses only, while ratings such as 15 through 6000 listed in Table 240.6(A) (including 110) apply to both fuses and inverse time circuit breakers.
NEC 2023 Section 240.6(A) and Table 240.6(A)
Key Terms
Grounded, Functionally (Functionally Grounded) NEC 2023 Article 100 — Definition of 'Grounded, Functionally'
A system that has an electrical ground reference for operational purposes that is not solidly grounded, often connected to ground through electronic means internal to an inverter or charge controller.
Branch Circuit, Multiwire NEC 2023 Article 100 — Definition of Branch Circuit, Multiwire
Two or more ungrounded conductors that have a voltage between them plus a neutral having equal voltage to each ungrounded conductor; two breakers on the same phase do not qualify because there is no voltage between them.
Accessible, Readily NEC 2023 Article 100 — Definition of 'Accessible, Readily'
Capable of being reached quickly without requiring the use of tools (other than keys), climbing over or under, removing obstacles, or using portable ladders — so a locked enclosure opened with a key may still be readily accessible.
Cable, Medium Voltage (Type MV) NEC 2023 Article 100 — Definition of 'Cable, Medium Voltage (Type MV)'
A single or multiconductor solid dielectric insulated cable rated 2001 volts up to and including 35,000 volts, nominal.
Busway NEC 2023 Article 100 — Definitions of Raceway, Busway, Cable Tray System, Lighting Track, and Multioutlet Assembly
A raceway consisting of a metal enclosure containing factory-mounted bare or insulated conductors; it must be supported at intervals not exceeding 1.5 m (5 ft) unless otherwise designed and marked.
Separately derived system (on-site generation) American Electricians' Handbook, 17th ed., Page 3.6
The NEC classification of a premises supply that comes from an on-site power production facility rather than the serving utility.
Copper-clad aluminum conductor NEC 2023 Section 310.3(B)
A conductor in which the copper forms a minimum 10 percent of the cross-sectional area of a solid conductor or of each strand of a stranded conductor.
Type SIS insulation NEC 2023 Table 310.4(1)
A 90°C-rated insulation designated in Table 310.4(1) for switchboard and switchgear wiring only.
Type XHHW insulation NEC 2023 Table 310.4(1)
An insulation rated 90°C (194°F) in dry and damp locations and 75°C (167°F) in wet locations.
Type THHW insulation American Electricians' Handbook, 17th ed., Page 2.12
A moisture- and heat-resistant thermoplastic insulation usable in wet or dry locations at a maximum conductor temperature of 75°C in wet locations and 90°C in dry locations.
Equipment bonding jumper installed on the outside of a raceway NEC 2023 Section 250.102(E)(2)
A bonding jumper whose length shall not exceed 1.8 m (6 ft) and that must be routed with the raceway or enclosure, except that longer jumpers are permitted at outside pole locations for bonding isolated sections of metal raceways or elbows in exposed risers and for bonding grounding electrodes.
Box fill — yoke or strap allowance NEC 2023 Section 314.16(B)(4)
For each yoke or strap containing one or more devices or equipment, a double volume allowance from Table 314.16(B)(1) based on the largest conductor connected to the device(s) supported by that yoke or strap.
Box fill — internal cable clamp allowance NEC 2023 Section 314.16(B)(2)
Where one or more internal cable clamps (factory or field supplied) are present, only a single volume allowance based on the largest conductor in the box is required; no allowance is needed for cable connectors with clamping mechanisms outside the box.
Conduit body enclosing 6 AWG or smaller conductors NEC 2023 Section 314.16(C)(1)
A conduit body that must have a cross-sectional area not less than twice the cross-sectional area of the largest conduit or tubing to which it can be attached.
NEMA Design D motor American Electricians' Handbook, 17th ed., Pages 7.63 to 7.64 and 7.69 (Secs. 162 and 169)
A squirrel-cage motor for full-voltage starting with high locked-rotor torque (at least 275 percent of full-load torque), locked-rotor current not greater than standard values, and rated-load slip of 5 percent or more, suited to punch presses, shears, and heavy-inertia flywheel machinery.
Abandoned/future-use audio distribution cable tag NEC 2023 Section 640.6(C)(2)
A tag on audio distribution cable left in place for future use that must show the date the cable was identified for future use, the date of intended use, and information on the intended future use; untagged accessible abandoned cable must be removed.
Liquidtight flexible metal conduit as an equipment grounding path American Electricians' Handbook, 17th ed., Page 9.65 (Sec. 179)
LFMC in trade sizes 3/4 in. through 1-1/4 in. is suitable for grounding in a ground return path of 1.8 m (6 ft) or less where the circuit is protected at 60 A or less with fittings listed for grounding; trade sizes 3/8 and 1/2 in. are limited to 20 A.
Formulas to Know
Ohm's law (voltage and current)E = I × R; I = E / R — e.g., 8 A × 15 Ω = 120 V; 240 V / 48 Ω = 5 A
Power, and current from powerP = E × I; I = P / E — e.g., 120 V × 12.5 A = 1,500 W; 1,500 W / 120 V = 12.5 A
Power of a fixed resistance at a different applied voltageP = E² / R — power varies with the square of the voltage; at half rated voltage the power is (1/2)² = 1/4 of rating (1,200 W at 240 V → 300 W at 120 V)
Kilovolt-amperes, three-phase ACkVA = (E × I × 1.73) / 1000 (1.73 = √3; power factor is not used because kVA is apparent power)
Kilowatts, DC circuitkW = (E × I) / 1000 (DC formulas do not use PF, 2, or 1.73)
Apparent power from real power and power factorS (kVA) = P (kW) ÷ PF — e.g., 200 kW ÷ 0.8 = 250 kVA
Wye system line-to-line voltageV(line-to-line) = V(line-to-neutral) × 1.732 — e.g., 277 V × 1.732 = 480 V
Effective impedance at a power factor other than the tabulated one (Chapter 9, Table 9, Note 2)Effective Z = R cos(θ) + X sin(θ); for another circuit power factor, Ze = R × PF + XL sin[arccos(PF)]
Pull/junction box minimum dimensionsStraight pull: length ≥ 8 × trade size of largest raceway (8 × 2 in. = 16 in.; 8 × 2½ in. = 20 in.). Angle pull: distance to opposite wall ≥ 6 × largest raceway in the row + sum of the other raceway trade sizes in that row on the same wall (three 3-in. conduits: 6 × 3 + 3 + 3 = 24 in.; 6 × 3½ + 1½ + 2 = 24½ in.). Entries enclosing the same conductors: ≥ 6 × the larger raceway apart (6 × 3½ = 21 in.)
Combined ambient correction and conductor-bundling adjustmentFinal ampacity = base table ampacity × temperature correction factor × adjustment factor — e.g., 100 A × 0.88 (75°C conductor at 40°C) × 0.80 (4–6 current-carrying conductors) = 70.4 A
