Hoja de Referencia del Examen · Referencia Rápida
Oklahoma Residential Electrical Journeyman
Oklahoma · PSI Services Contractor
Verificado, no estimado. Cada cifra a continuación proviene de la estructura oficial del examen que mantenemos: número de preguntas, puntaje de aprobación y ponderación de temas. Las preguntas de práctica están fundamentadas en la ley fuente con citas de estatutos. Omitimos cualquier cifra que no podamos verificar en lugar de adivinarla.
Total de preguntas
80
Puntaje de aprobación
70%
Tiempo del examen
210 min
Administrado por
PSI Services Contractor
Formato
Se permiten materiales de referencia
Porción Estatal de Oklahoma 80 preguntas
Conocimientos Generales
4 Q · 5%
Purpose and scope of the NEC (practical safeguarding of persons and property)NEC code arrangement and chapter organizationMandatory versus permissive rules and explanatory material (shall/shall not vs. shall be permitted)Authority having jurisdiction (AHJ) enforcement and special permissionCommon field terms versus official NEC terminologyElectrical schematic and wiring diagram symbolsOhm's Law formulas relating voltage, current, resistance, and power (E, I, R, P)
Conocimientos Eléctricos Generales
12 Q · 15%
Ohm's Law and power formulas (P, E, I, R relationships)Series, parallel, and combination circuit calculationsVoltage drop calculations for single-phase and three-phase circuitsConductor ampacity tables and temperature rating selectionAmpacity correction and adjustment factors (ambient temperature and conductor bundling)Electrical formulas for AC/DC amperes, kilowatts, kVA, and horsepowerTransformer calculations (primary/secondary amperes, kVA sizing, turns ratio)NEC branch-circuit and feeder load calculations including demand factors
Requisitos de Instalación Eléctrica
10 Q · 12%
Conductor types, insulation ratings, and ampacity tables (NM, MC, AC, MI, SE, USE, UF)Cable installation methods: securing, supporting, and bending radius requirementsProtection of cables and raceways against physical damage through framing membersUnderground installation requirements and minimum burial cover depthsOutlet, device, pull, and junction box sizing and fill calculationsReceptacle installation, grounding, and wet/damp location requirementsPanelboard, switchboard, and switchgear installation and working clearancesLuminaire and appliance installation requirements including disconnecting means and GFCI protection
Acometidas, Alimentadores y Circuitos Ramales
10 Q · 12%
Branch circuit ratings, conductor sizing, and overcurrent protection requirements (Articles 210, 215)Service entrance requirements: overhead and underground conductors, clearances, wiring methods, and service equipment (Article 230)Load calculations for dwelling units and non-dwelling occupancies using standard and optional methods (Article 220)Demand factors for lighting, appliances, cooking equipment, dryers, and receptacle loadsGFCI and AFCI protection requirements for branch circuits in dwelling and non-dwelling locationsVoltage drop calculations for single-phase and three-phase circuitsConductor ampacity tables, temperature correction factors, and adjustment factors for multiple conductorsService disconnecting means: location, rating, number, and emergency disconnect requirements
Protección contra Sobrecorriente
8 Q · 10%
Conductor overcurrent protection and standard ampere ratings (NEC 240.4 and 240.6)Location of overcurrent protective devices in circuits (tap rules: 10 ft, 25 ft, outside taps)Types and requirements for fuses: plug fuses, Type S, Edison-base, and cartridge fusesCircuit breaker requirements: marking, ratings, indicating, and application (voltage ratings, series ratings)Motor branch-circuit overcurrent protection: maximum rating or setting by device type (NEC 430.52)Ground-fault protection of equipment (NEC 240.13) and supplementary overcurrent protectionArc energy reduction requirements for high-ampere overcurrent devices (240.67 and 240.87)Short-circuit current calculations and panelboard short-circuit current ratings (NEC 408.6)
Puesta a Tierra y Unión
8 Q · 10%
Grounding electrode types, installation requirements, and the grounding electrode system (NEC 250.50–250.54)Grounding electrode conductor sizing, material, and installation (NEC 250.62–250.66, Table 250.66)Equipment grounding conductor types, sizing, and identification (NEC 250.118–250.122, Table 250.122)Main bonding jumper and system bonding jumper requirements and sizing (NEC 250.28, Table 250.102(C)(1))Bonding of piping systems, structural metal, and service equipment (NEC 250.92–250.104)Grounding of service-supplied AC systems and separately derived systems (NEC 250.24–250.30)Equipment grounding conductor connections at boxes, receptacles, and fixed equipment (NEC 250.130–250.148)Surge-protective device (SPD) and surge arrester grounding and bonding connections (NEC Article 242)
Conductores y Cables
4 Q · 5%
Conductor insulation type designations and application provisions (e.g., THHN, THWN, RHW, XHHW) including maximum operating temperatures and permitted locations (dry, damp, wet)Ampacity tables for conductors in raceways, cables, and free air (Tables 310.16 and 310.17) for copper and aluminum conductorsAmbient temperature correction factors and adjustment factors for more than three current-carrying conductorsMinimum conductor size, material requirements, and stranding rules for conductors rated up to 2000 voltsConductors in parallel: size restrictions, matching requirements, and installation conditionsSingle-phase dwelling service and feeder conductor sizing (NEC 310.12)Flexible cord and cable types, permitted and prohibited uses, ampacity, and marking requirementsFixture wire types, ampacities, minimum size, permitted uses, and grounding conductor identification
Canaletas y Cajas
6 Q · 8%
Box fill calculations (conductor volume allowances per AWG size)Conduit fill percentage limits and conductor count tables (EMT, RMC, IMC, FMC, PVC, LFMC, ENT)Securing and supporting requirements for conduit and tubing typesPull and junction box sizing for straight and angle pulls (Article 314.28)Uses permitted and not permitted for each raceway typeOutlet box sizing and support for luminaires, paddle fans, and equipmentConduit bending requirements (bend radius, degrees per run, offset calculations)Wireway and auxiliary gutter fill limits and installation requirements
Ocupaciones y Equipos Especiales
8 Q · 10%
Hazardous location classification (Class I, II, III; Divisions 1 and 2; Groups A-G)Wiring methods and sealing requirements in hazardous classified locationsSwimming pools, spas, and fountains — GFCI protection, bonding, and equipotential planesHealth care facilities — essential electrical systems, patient care spaces, and groundingMotor branch-circuit conductors, overload protection, and short-circuit/ground-fault protectionAir-conditioning and refrigerating equipment — disconnecting means, branch-circuit protection, and markingsMobile homes, manufactured homes, recreational vehicles, and marinas — power supply and wiring requirementsTransformers, generators, and temporary installations — overcurrent protection and installation requirements
Baja Tensión, Alarmas, Sistemas de Señalización y Comunicaciones
4 Q · 5%
Fire alarm circuit types: NPLFA vs. PLFA power sources, branch circuit requirements, and disconnecting means identificationFire alarm cable types, ratings, and permitted applications by location (plenum, riser, general-purpose: FPLP, FPLR, FPL, NPLFP, NPLFR, NPLF)Separation requirements between fire alarm circuits and electric light/power conductorsCommunications cable types and permitted applications by location (CMP, CMR, CMG, CM, CMX) and cable substitution hierarchyBonding and grounding of communications systems, antenna systems, and CATV coaxial cable shieldsAntenna system installation requirements: conductor sizing, clearances, discharge units, and grounding electrode conductors (Article 810)CATV and network-powered broadband communications systems: power limitations, cable types, and grounding of coaxial cable shieldsLow-voltage lighting system requirements: voltage limitations, isolating power supply, secondary circuit grounding, and branch circuit ratings
Iluminación y Señales
4 Q · 5%
Luminaire location requirements (wet, damp, corrosive, bathtub/shower zones, clothes closets)Support and mounting of luminaires (outlet boxes, suspended ceilings, poles, trees)Grounding and bonding of luminaires and lighting equipmentRecessed luminaire installation (clearances, thermal protection, insulation contact, Type IC)Lighting track installation, construction, and restrictionsElectric signs and outline lighting disconnecting means and branch circuit requirementsNeon secondary-circuit wiring (1000V or less and over 1000V) and transformer/power supply requirementsLow-voltage lighting systems (voltage limitations, secondary circuit isolation, branch circuit requirements)
Seguridad
2 Q · 2%
Lockout/tagout procedures and establishing an electrically safe work conditionArc-flash hazard assessment and PPE categories (arc ratings by cal/cm²)Shock protection boundaries (limited and restricted approach boundaries)Electrical protective equipment inspection, care, and use (rubber insulating gloves, blankets, sleeves)Ground-fault circuit interrupter (GFCI) and assured equipment grounding conductor program requirementsPersonal protective equipment criteria, selection, and employer payment obligationsFirst aid, medical services, and emergency action plan requirements on construction sitesEmployer and employee responsibilities for electrical safety (OSHA and NFPA 70E)
Distinciones Clave
Chapters 1–4 (NEC)vsChapters 5–7 (NEC)
Chapters 1–4 apply generally to ALL electrical installations, while Chapters 5–7 apply only to special occupancies, special equipment, or other special conditions and may supplement or modify Chapters 1–4.
Article 90.3Chapter 8 (Communications Systems)vsChapters 1–7 (NEC)
Chapter 8 covers communications systems and is NOT subject to the requirements of Chapters 1–7 except where those requirements are specifically referenced in Chapter 8.
Article 90.3Mandatory Rules ('shall/shall not')vsInformational Notes
Mandatory rules use 'shall' or 'shall not' and are enforceable, while Informational Notes are informational only and are not enforceable as Code requirements.
NEC 90.5(A)Grounded Conductor (Neutral) — color identificationvsEquipment Grounding Conductor — color identification
Grounded (neutral) conductors must be identified by continuous white or gray insulation (or white/silver terminals); equipment grounding conductors must be green or green with yellow stripes — these colors are never interchangeable.
NEC 200.9Grounded Conductor ≤6 AWGvsGrounded Conductor ≥4 AWG
Conductors 6 AWG or smaller must have a continuous white or gray outer finish; conductors 4 AWG or larger may instead be marked with distinctive white or gray marking at terminations only.
NEC 200.6(A)10-ft Feeder Tap Rulevs25-ft Feeder Tap Rule (one-third rule)
For taps ≤10 ft, conductor ampacity must equal the combined calculated loads and not less than the overcurrent device rating at the subpanel; the 25-ft tap permits the one-third ampacity rule instead.
NEC Handbook, Section 240.21(B)(1)Plug Fuses ≤15 AvsPlug Fuses >15 A
Plug fuses rated 15 A and lower are physically distinguished by a hexagonal configuration of the window, cap, or other prominent part; higher-rated fuses do not require this hexagonal feature.
NEC 2023, Section 240.50(C)Continuous Load (branch circuit sizing)vsNoncontinuous Load (branch circuit sizing)
Conductor ampacity must be at least 125% of the continuous load portion but only 100% of the noncontinuous load portion when sizing branch circuits.
NEC 210.19(A)(1)White/Gray Insulation as Grounded ConductorvsWhite/Gray Insulation Re-identified as Ungrounded Conductor
White or gray insulation used as a grounded (neutral) conductor needs no special marking, but when re-identified for use as an ungrounded conductor in circuits ≥50 V it must be permanently marked at every visible/accessible location with tape, paint, or other means in a non-white/gray/green color.
NEC 200.7(C)AFCI Protection — Outlet Branch-Circuit Type with 14 AWG (≤50 ft)vsAFCI Protection — Standard Circuit Breaker Method
Using an outlet branch-circuit-type AFCI with a supplemental arc protection circuit breaker, the branch-circuit wiring from the overcurrent device to the first outlet must not exceed 50 ft for 14 AWG; the standard method uses a listed AFCI circuit breaker with no such length restriction.
NEC 210.12(A)(3)(b)Individual Branch Circuit RatingvsMultioutlet Branch Circuit Standard Ratings
Individual branch circuits may have any rating required by the load served, while other (multioutlet) branch circuits must be rated at 10, 15, 20, 30, 40, or 50 amperes.
NEC 210.18Neutral Conductor — Multiwire Branch CircuitvsNeutral Conductor — Shared Across Separate Branch Circuits
A neutral conductor may serve one branch circuit or one multiwire branch circuit, but it shall NOT be shared across more than one branch circuit or more than one set of ungrounded feeder conductors unless specifically permitted by the Code.
NEC 200.4(A)Términos Clave
Purpose of the NEC (NEC 90.2(A)) NEC 90.2(A)
The practical safeguarding of persons and property from hazards arising from the use of electricity; the Code is not a design specification or instruction manual for untrained persons.
NEC Scope Exclusions (Article 90.2(B)/(D)) Article 90.2(D)
The NEC does NOT cover installations in ships, watercraft (other than floating buildings), railway rolling stock, aircraft, or automotive vehicles other than mobile homes and recreational vehicles.
Mandatory Rule Language (NEC 90.5(A)) NEC 90.5(A)
Rules that are specifically required or prohibited are characterized by the terms 'shall' or 'shall not' and are enforceable.
Informational Note (NEC 90.5(C)) NEC 90.5(C)
Informational notes appearing in the NEC are informational only and are not enforceable as requirements of the Code.
NEC Measurement System of Preference (NEC 90.9(A)/(B)) NEC 90.9(A), 90.9(B)
The NEC uses SI (metric) units as the system of preference; SI units appear first and inch-pound units immediately follow in parentheses.
Grounded Conductor Continuity (NEC 200.2(B)) NEC 200.2(B)
The continuity of a grounded conductor shall not depend on connection to a metal enclosure, raceway, or cable armor; continuity must be maintained independently.
Grounded Conductor Terminal Identification (NEC 200.9 / 200.10(B)) NEC 200.9
Terminals for grounded conductors on receptacles, plugs, and connectors shall be identified by a white or silver metal coating, or by the word 'white' or letter 'W' adjacent to the terminal.
Screw Shell Device Polarity (NEC 200.10(C)) NEC 200.10(C)
For screw shell devices, the grounded conductor shall be connected to the terminal that is connected to the screw shell to ensure correct polarity.
Equipment Grounding Conductor Color — Flexible Cord (NEC 250.119(D) / NEC 400.23) NEC 250.119(D), NEC 400.23
Equipment grounding conductors in flexible cords must have a continuous green insulation finish or green with one or more yellow stripes, and these colors shall not be used for any other purpose.
Free Conductor Length at Outlet/Junction (NEC 300.14) NEC 300.14
At least 150 mm (6 in.) of free conductor, measured from where it exits the raceway or cable sheath, must be left at each outlet, junction, and switch point.
AFCI Protection Requirement — Dwelling Units (NEC 210.12(B)) NEC 210.12(B)
All 120-volt, single-phase, 10-, 15-, and 20-ampere branch circuits supplying outlets or devices in specified dwelling unit locations (including bedrooms) must be AFCI protected.
Laundry Circuit Requirement (NEC 210.11(C)(2)) NEC 210.11(C)(2)
Dwelling units must have at least one dedicated 20-ampere branch circuit provided solely to supply the laundry receptacle outlet(s).
Household Range Minimum Branch-Circuit Rating (NEC 210.19(C)) NEC 210.19(C)
Branch circuits supplying household ranges or cooking appliances rated 8¾ kW or more must have a minimum branch-circuit rating of 40 amperes.
Voltage Drop Recommendation — Branch Circuits (NEC 210.19 Informational Note) NEC 210.19, Informational Note
The NEC recommends (but does not mandate) that branch-circuit voltage drop not exceed 3% at the farthest outlet for reasonable efficiency of operation.
Maximum Voltage — Dwelling Unit Cord-and-Plug Loads ≤1440 VA (NEC 210.6(A)) NEC 210.6(A)
In dwelling units, the voltage between conductors supplying cord-and-plug-connected loads of 1440 VA or less shall not exceed 120 volts nominal.
Plug Fuse ≤15 A Physical Identification (NEC 240.50(C)) NEC 2023, Section 240.50(C)
Plug fuses rated 15 amperes and lower must be identified by a hexagonal configuration of the window, cap, or other prominent part to distinguish them from higher-rated fuses.
Fórmulas que Debes Saber
Minimum Branch-Circuit Conductor Ampacity (Continuous + Noncontinuous Loads)
Ampacity ≥ (Noncontinuous Load) + 1.25 × (Continuous Load)Neutral Conductor Ampacity — 3-Wire Range Circuit (minimum)
Neutral Ampacity ≥ 0.70 × Branch-Circuit Rating (and ≥ 10 AWG)Voltage Drop Percentage
VD% = (Voltage Drop ÷ Source Voltage) × 100 [NEC recommends ≤3% for branch circuits, ≤5% total]10-Foot Feeder Tap — Minimum Tap Conductor Ampacity
Tap Ampacity ≥ Combined Calculated Load of Circuits Supplied AND ≥ Rating of OCPD at Termination of TapFree Conductor Length at Box
Free Length ≥ 150 mm (6 in.) measured from point of exit from raceway or cable sheathAFCI Wiring Length Limit (14 AWG, Outlet Branch-Circuit Type)
Length from OCPD to first outlet ≤ 50 ft (15.2 m) for 14 AWG conductor