Hoja de Referencia del Examen · Referencia Rápida
Louisiana Electrical Statewide
Louisiana · 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
100
Puntaje de aprobación
70%
Tiempo del examen
240 min
Administrado por
PSI Services Contractor
Formato
Se permiten materiales de referencia
Porción Estatal de Louisiana 100 preguntas
Conocimientos Generales
4 Q · 4%
Ohm's Law formulas and calculations (voltage, current, resistance, power)Series, parallel, and combination circuit analysisElectrical formulas for AC and DC systems (amperes, kilowatts, kVA, horsepower)Kirchhoff's Current and Voltage LawsThree-phase and single-phase power calculations and distribution systemsImpedance, inductive reactance, and capacitive reactanceNEC Article 90 scope, purpose, code arrangement, and enforcementSelecting and using test instruments (multimeters, clamp-on ammeters, non-contact voltage testers)
Conocimientos Eléctricos Generales
10 Q · 10%
Ohm's Law formulas and calculations (voltage, current, resistance, power)Series, parallel, and combination circuit analysisVoltage drop calculations for single-phase and three-phase circuitsElectrical formulas for amperes, kilowatts, kVA, and horsepower (DC, single-phase, three-phase)Impedance, reactance, inductance, and capacitance in AC circuitsPower factor, apparent power, and power factor correctionCommon electrical distribution systems and conductor color codingNEC scope, arrangement, and mandatory vs. permissive rule language
Requisitos de Instalación Eléctrica
10 Q · 10%
Branch circuit ratings, types, and voltage limitationsGrounding and bonding requirements for electrical systems and equipmentOvercurrent protection sizing and device placementService entrance conductor sizing, installation, and clearancesLoad calculations for branch circuits, feeders, and servicesWiring methods and raceway selection (EMT, RMC, IMC, PVC, FMC, LFMC)Cable assembly installation requirements (NM, MC, AC, SE/USE)GFCI and AFCI protection requirements by location and occupancy
Acometidas, Alimentadores y Circuitos Ramales
10 Q · 10%
Branch-circuit load calculations for dwelling and non-dwelling occupanciesFeeder and service load calculations including demand factorsGFCI and AFCI protection requirements by location and occupancy typeService conductor sizing, ampacity, and wiring methodsOvercurrent protection: ratings, location, and tap conductor rulesGrounding electrode system, conductor sizing, and bonding requirementsConductor ampacity correction and adjustment factorsVoltage drop calculations for branch circuits and feeders
Protección contra Sobrecorriente
9 Q · 9%
Standard ampere ratings for fuses and circuit breakers (Table 240.6)Protection of conductors by overcurrent device ratings (240.4 small conductor rules and next-size-up provisions)Location of overcurrent protective devices in circuits including feeder and transformer secondary tap rules (240.21)Motor branch-circuit short-circuit and ground-fault protection ratings and device selection (Table 430.52)Motor overload protection requirements and trip current percentages (430.32)Transformer overcurrent protection requirements (Tables 450.3(A) and 450.3(B))Fire pump overcurrent protection special rules (no overload protection, locked-rotor carry requirements)Overcurrent protection for systems over 1000 volts including high-voltage fuses and circuit breakers (Article 245)
Puesta a Tierra y Unión
10 Q · 10%
Grounding electrode system types and installation requirements (NEC 250.52–250.54)Sizing of grounding electrode conductors for AC systems (Table 250.66)Equipment grounding conductor types, sizing, and identification (NEC 250.118–250.122)Main bonding jumper and system bonding jumper requirements (NEC 250.28)Sizing of grounded conductor, main bonding jumper, and supply-side bonding jumper (Table 250.102(C)(1))Bonding of piping systems, structural metal, and service equipment (NEC 250.92–250.104)Grounding of separately derived AC systems (NEC 250.30)Identification and use of grounded conductors (NEC Article 200)
Conductores y Cables
8 Q · 8%
Conductor insulation types, temperature ratings, and application provisions (Table 310.4)Ampacity tables for conductors in raceways, cables, and free air (Tables 310.16–310.21)Ampacity correction factors for ambient temperature and adjustment factors for more than three current-carrying conductorsConductor material, minimum size, stranding, and parallel installation requirementsCable type uses permitted and uses not permitted (NM, MC, AC, MI, SE/USE, UF, TC, ITC, FC, FCC, MV)Securing, supporting, and bending radius requirements for cable typesGrounded conductor identification methods and color coding (Article 200)Voltage drop calculations and conductor sizing for single-phase and three-phase circuits
Canaletas y Cajas
7 Q · 7%
Conduit fill calculations and conductor count limits by raceway typeSecuring and support intervals for conduit and tubing typesPermitted and prohibited uses for each raceway type (RMC, IMC, EMT, FMC, LFMC, PVC, ENT, LFNC, FMT, HDPE, RTRC, NUCC)Box fill calculations and minimum box volume requirementsPull and junction box sizing for conductors 4 AWG and largerUnderground installation requirements and minimum cover depths for racewaysProtection of raceways and cables against physical damageGrounding and bonding requirements for metal raceways and boxes
Ocupaciones y Equipos Especiales (Incluidas Albercas)
10 Q · 10%
Swimming pool bonding and equipotential bonding requirementsGFCI and SPGFCI protection for pools, spas, fountains, and similar installationsUnderwater luminaires and junction box installation requirementsHazardous location classification (Class I, II, III; Division 1 and 2; Zone 0/1/2)Wiring methods and sealing requirements for hazardous classified locationsHealth care facility essential electrical systems and patient care space wiringSpecial occupancy wiring requirements for garages, marinas, motor fuel dispensing, and agricultural buildingsElectrical installations for elevators, fire pumps, cranes, and electric vehicle supply equipment
Bajo Voltaje, Alarmas, Sistemas de Señalización y Comunicaciones
2 Q · 2%
Fire alarm circuit wiring methods and cable types (NPLFA and PLFA)Power sources and branch circuit requirements for fire alarm systemsSeparation and mixing rules for low-voltage circuit conductors with other systemsClass 2 and Class 3 power-limited circuit installation and power source requirementsCommunications cable types, applications, and substitution hierarchyGrounding and bonding of communications system entrance cablesOptical fiber cable types, applications, and installation in buildingsClass 4 fault-managed power systems installation and listing requirements
Iluminación y Letreros
10 Q · 10%
Luminaire installation requirements by location (wet, damp, corrosive, closets, bathtub/shower zones)Recessed luminaire clearances, thermal protection, and Type IC vs. non-IC classificationsLighting track installation, construction requirements, and prohibited locationsElectric sign and outline lighting disconnecting means, branch circuit requirements, and grounding/bondingNeon secondary-circuit wiring requirements (1000 volts or less and over 1000 volts)Low-voltage lighting system voltage limitations, isolation, and branch circuit requirementsFixture wire types, ampacity, minimum size, and permitted usesStage and theater lighting wiring methods, dimmers, and equipment grounding
Seguridad
4 Q · 4%
Lockout/tagout procedures and establishing an electrically safe work conditionElectrical shock protection boundaries (limited and restricted approach)Arc-flash hazard assessment and PPE categories by arc ratingGround-fault circuit interrupter (GFCI) and assured equipment grounding conductor program requirementsWorking clearances and minimum depth of clear working space at electrical equipmentPersonal protective equipment for electrical work (rubber insulating gloves, sleeves, blankets, and classes)Fall protection systems for electrical construction work (personal fall arrest, positioning, guardrail)Ladder and stairway safety requirements on construction sites
Motores y Transformadores
6 Q · 6%
Motor branch-circuit conductor sizing (125% of full-load current rule)Motor branch-circuit short-circuit and ground-fault protective device ratings (Table 430.52)Motor overload protection requirements and trip current percentages (430.32)Motor disconnecting means types, ratings, and location requirements (430.109/430.110)Motor feeder conductor sizing and overcurrent protection for multiple motors (430.24/430.62)Transformer overcurrent protection ratings for primary and secondary (Article 450/Table 450.3)Transformer sizing, kVA calculations, and primary/secondary current calculationsMotor controller ratings, marking requirements, and motor control centers (430.8/430.83/430.98)
Distinciones Clave
Type SJ flexible cordvsType SO flexible cord
Type SJ is rated for hard usage up to 300 V in damp locations, while Type SO is rated for extra-hard usage up to 600 V.
Table 400.4Type SPT-1 flexible cordvsType SJ flexible cord
Type SPT-1 is rated for light (not hard) usage at a maximum of 300 V, whereas Type SJ is rated for hard usage.
Table 400.4Portable power feeder cable Types G, SHD-PCG, SHD-CGCvsPortable power feeder cable Types SH, SHD, SHD-GC
Types G, SHD-PCG, and SHD-CGC are permitted only from 2000 V to 5000 V, while Types SH, SHD, and SHD-GC are permitted from 2000 V up to 25,000 V.
NEC 400.50Ammeter (M1)vsVoltmeter (M2)
An ammeter is connected in series with very low internal resistance to measure current, while a voltmeter is connected in parallel with very high internal resistance to measure potential difference.
Stranded conductors (8 AWG and larger in raceways)vsSolid conductors
Conductors 8 AWG and larger installed in raceways must be stranded, unless the Code specifically permits or requires solid conductors.
NEC 2023, Section 310.3(C)Plug fuses 15 A and lowervsPlug fuses above 15 A
Plug fuses rated 15 A and lower are identified by a hexagonal configuration of the window, cap, or other prominent part to distinguish them from higher-rated fuses.
NEC 2023, Section 240.50(C)Non-Type IC recessed luminairevsSurface-mounted incandescent/LED luminaire in clothes closet
Non-Type IC recessed luminaires require at least 13 mm (1/2 in.) clearance from combustible material, while surface-mounted incandescent or LED luminaires with enclosed sources in clothes closets require at least 300 mm (12 in.) clearance from storage space.
NEC 410.116(A)(1)Direct-buried cable (underground)vsRigid metal conduit or IMC (underground)
Direct-buried cable requires a minimum cover of 600 mm (24 in.) in general locations, while rigid metal conduit or IMC requires only 150 mm (6 in.) of minimum cover.
NEC Table 300.5(A)Flexible cord used as fixed wiringvsFlexible cord used for portable/pendant applications
Flexible cords are explicitly prohibited as a substitute for the fixed wiring of a structure but are permitted for portable or pendant uses as listed in Table 400.4.
NEC 400.12(1)NEC purpose (safety)vsNEC as a design specification
The NEC is intended for the practical safeguarding of persons and property from electrical hazards; it is explicitly NOT intended as a design specification or instruction manual for untrained persons.
NEC 90.1(A)Office furnishing interconnection flexible cord (605.5)vsFlexible power supply cord for freestanding office furnishings (605.9(A))
Both are limited to 600 mm (2 ft), but 605.5 applies to cord connections between office furnishings while 605.9(A) applies to the power supply cord connecting freestanding furnishings to the outlet.
NEC 605.5Three-way wall switch symbol (S3)vsSingle-pole wall switch symbol (S)
A three-way switch is represented on blueprints as 'S' with a subscript '3' (S3), while a single-pole switch is represented by a plain 'S'.
Términos Clave
Stranded conductor requirement in raceways (NEC 310.3(C)) NEC 2023, Section 310.3(C)
Per NEC 310.3(C), conductors 8 AWG and larger installed in raceways shall be stranded unless the Code specifically permits or requires solid conductors.
Plug fuse identification (NEC 240.50(C)) NEC 2023, Section 240.50(C)
Per NEC 240.50(C), plug fuses rated 15 A and lower must have a hexagonal configuration of the window, cap, or other prominent part to distinguish them from higher-rated fuses.
Office furnishing cord length limit (NEC 605.5 / 605.9(A)) NEC 605.5
Per NEC 605.5 and 605.9(A), flexible cords used for office furnishing interconnections and power supply connections shall not exceed 600 mm (2 ft) in length.
Minimum free conductor length at outlet (NEC 300.14) NEC 300.14
Per NEC 300.14, at least 150 mm (6 in.) of free conductor shall be left at each outlet, junction, and switch point for splices or device connections.
Branch-circuit conductor insulation near ballasts (NEC 410.68) NEC 410.68
Per NEC 410.68, branch-circuit conductors within 75 mm (3 in.) of a ballast, LED driver, power supply, or transformer must have an insulation temperature rating of not less than 90°C (194°F).
Switch handle height limit (NEC 404.8(A)) NEC 404.8(A)
Per NEC 404.8(A), the center of the grip of a switch or circuit breaker operating handle in its highest position shall not be more than 2.0 m (6 ft 7 in.) above the floor.
Minimum fixture wire size (NEC 402.6) NEC 402.6
Per NEC 402.6, fixture wires shall not be smaller than 18 AWG.
Autotransformer branch circuit condition (NEC 210.9) NEC 210.9
Per NEC 210.9, branch circuits shall not be derived from autotransformers unless the supplied circuit has a grounded conductor electrically connected to the grounded conductor of the supplying system.
Nonmetallic-sheathed cable sheath extension into box (NEC 314.17(B)(2)) NEC 314.17(B)(2)
Per NEC 314.17(B)(2), nonmetallic cable sheath must extend not less than 6 mm (1/4 in.) inside the box and 6 mm (1/4 in.) beyond any cable clamp.
Overhead service conductor clearance over residential property (NEC 230.24(B)) NEC 230.24(B)
Per NEC 230.24(B), overhead service conductors must maintain a minimum vertical clearance of 3.7 m (12 ft) over residential property and driveways where voltage does not exceed 300 V to ground.
Raceway-supported enclosure size limit (NEC 314.23(E)) NEC 314.23(E)
Per NEC 314.23(E), an enclosure supported only by entering raceways that contains no devices (other than splicing devices) and no luminaires shall not exceed 1650 cm³ (100 in.³).
Type FFH-2 fixture wire maximum temperature NEC Table 402.13
Per NEC Table 402.13, Type FFH-2 heat-resistant rubber-covered fixture wire has a maximum operating temperature of 75°C (167°F).
Portable power feeder cable ampacity correction factor (Table 400.51(A)(3)) Table 400.51(A)(3)
Per NEC Table 400.51(A)(3), when a portable power feeder cable has 2 layers wound on a reel, a multiplying correction factor of 0.65 must be applied to the ampacity.
Flexible cord marking interval (NEC 400.6(A)) NEC 400.6(A)
Per NEC 400.6(A), flexible cords must be durably marked on the surface with type designation, size, and number of conductors at intervals not exceeding 610 mm (24 in.).
Freestanding office furnishing maximum assembled length (NEC 605.9) NEC 605.9
Per NEC 605.9, freestanding office furnishings that are electrically connected and mechanically contiguous shall not exceed 9.0 m (30 ft) when assembled if connected by a single flexible cord and plug.
Fórmulas que Debes Saber
Ohm's Law – Voltage
E (V) = I (A) × R (Ω)Ohm's Law – Current
I (A) = E (V) ÷ R (Ω)Ohm's Law – Resistance
R (Ω) = E (V) ÷ I (A)Series circuit – Total resistance
R_total = R1 + R2 + R3 + …Parallel circuit – Total resistance (two resistors)
R_total = (R1 × R2) ÷ (R1 + R2)Ampacity correction – Cable on reel
Adjusted ampacity = Rated ampacity × Correction factor (e.g., 0.65 for 2 layers)Power formula
P (W) = E (V) × I (A)