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Test allowing reference materials, like the NEC.
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Journeyman Electrician Exam (NEC) — key terms, tricks & tips
Everything from the course in one searchable place: 343 entries. Use it to review before a practice test or look up a word you forgot.
343 results · showing first 300, refine your search
Code-Based Question
Requires finding specific rules or facts in the NEC.
Getting Started: Exam Overview
Calculation-Based Question
Requires mathematical computation using NEC formulas.
Getting Started: Exam Overview
NEC Navigation
Skill of efficiently finding information within the NEC.
Getting Started: Exam Overview
Table of Contents
Lists NEC chapters and articles for quick reference.
Getting Started: Exam Overview
Index
Alphabetical listing of keywords and their NEC locations.
Getting Started: Exam Overview
Ampacity
Maximum current a conductor can carry safely.
Getting Started: Exam Overview
Grounding Electrode System
Components connecting electrical system to earth.
Getting Started: Exam Overview
Understanding the Journeyman Exam Structure
To remember the exam structure: 'C.A.T.S.' — Code, Calculations, Time, and Search (for NEC).
Getting Started: Exam Overview
Understanding the Journeyman Exam Structure
The California Journeyman Electrician Exam heavily emphasizes the NEC. Be prepared for a significant number of questions requiring direct code lookup, especially from Chapters 1-4, and calculations involving load, conduit fill, and motor circuits. Pay close attention to California amendments if applicable to your test.
Getting Started: Exam Overview
Understanding the Journeyman Exam Structure
Spending too much time trying to memorize the entire NEC instead of learning how to navigate it.
Getting Started: Exam Overview
Understanding the Journeyman Exam Structure
Not practicing with timed exams, leading to poor time management on test day.
Getting Started: Exam Overview
Understanding the Journeyman Exam Structure
Neglecting the index and table of contents, making code lookups inefficient.
Getting Started: Exam Overview
Understanding the Journeyman Exam Structure
Failing to tab your NEC, which slows down critical information retrieval.
Getting Started: Exam Overview
NEC
National Electrical Code, governing electrical installations.
Getting Started: Exam Overview
Article
A major division within a NEC chapter, addressing a specific topic.
Getting Started: Exam Overview
Section
A detailed rule or requirement within an NEC article.
Getting Started: Exam Overview
Cross-reference
A notation in the NEC directing to related information elsewhere.
Getting Started: Exam Overview
Exception
A statement permitting an alternative or modifying a general rule.
Getting Started: Exam Overview
Shall
Indicates a mandatory requirement in the NEC.
Getting Started: Exam Overview
Navigating the National Electrical Code (NEC)
To remember the NEC structure: 'C-A-S-S' for Chapters, Articles, Sections, Subsections. It's like a cascading waterfall of rules!
Getting Started: Exam Overview
Navigating the National Electrical Code (NEC)
The California Electrical Code (CEC) is based on the NEC but includes specific California amendments. For the exam, always refer to the specific edition of the NEC adopted by California, and be aware that some articles may have state-specific modifications. Pay attention to any 'CA' notations in the margins.
Getting Started: Exam Overview
Navigating the National Electrical Code (NEC)
Not using the Index for specific searches, wasting time flipping pages.
Getting Started: Exam Overview
Navigating the National Electrical Code (NEC)
Ignoring cross-references, leading to incomplete understanding of a rule.
Getting Started: Exam Overview
Navigating the National Electrical Code (NEC)
Forgetting to check for Exceptions, which can change how a rule applies.
Getting Started: Exam Overview
Ohm's Law
V=I×R, relating voltage, current, and resistance.
Fundamentals of Electrical Theory
Kirchhoff's Voltage Law
Sum of voltages in a series loop equals zero.
Fundamentals of Electrical Theory
Kirchhoff's Current Law
Current entering a node equals current leaving.
Fundamentals of Electrical Theory
Watt (W)
Unit of electrical power.
Fundamentals of Electrical Theory
Power (P)
Rate at which electrical energy is converted.
Fundamentals of Electrical Theory
Node
A junction point where multiple circuit branches meet.
Fundamentals of Electrical Theory
Ohm's Law, Kirchhoff's Laws, and Power
Remember 'VIR' (Voltage = Current x Resistance) and 'PIV' (Power = Current x Voltage) like a 'VIP' at a 'P.I.V.' party!
Fundamentals of Electrical Theory
Ohm's Law, Kirchhoff's Laws, and Power
The California Journeyman Electrician Exam heavily emphasizes practical application of these laws. Expect questions that require you to calculate missing values in series and parallel circuits, often involving combined loads and voltage drops, as per NEC Articles 210 and 220.
Fundamentals of Electrical Theory
Ohm's Law, Kirchhoff's Laws, and Power
Confusing series and parallel circuit rules for voltage and current.
Fundamentals of Electrical Theory
Ohm's Law, Kirchhoff's Laws, and Power
Incorrectly applying Ohm's Law or power formulas (e.g., mixing up V, I, R).
Fundamentals of Electrical Theory
Ohm's Law, Kirchhoff's Laws, and Power
Forgetting to account for continuous load factors (125%) when sizing overcurrent protection.
Fundamentals of Electrical Theory
Direct Current (DC)
Electric current flowing in one direction only.
Fundamentals of Electrical Theory
Alternating Current (AC)
Electric current that periodically reverses direction.
Fundamentals of Electrical Theory
Voltage (V)
Electrical pressure that pushes electrons; measured in Volts.
Fundamentals of Electrical Theory
Current (I)
Flow rate of electric charge; measured in Amperes.
Fundamentals of Electrical Theory
Resistance (R)
Opposition to electric current flow; measured in Ohms.
Fundamentals of Electrical Theory
Circuit
A complete path for electric current to flow.
Fundamentals of Electrical Theory
Load
A device that consumes electrical energy.
Fundamentals of Electrical Theory
Conductor
Material that allows electric current to flow easily.
Fundamentals of Electrical Theory
AC/DC Circuits and Basic Electrical Principles
To remember AC vs. DC: Imagine a 'D' (Direct) as a straight line, always going one way. An 'A' (Alternating) has a wavy line, going back and forth!
Fundamentals of Electrical Theory
AC/DC Circuits and Basic Electrical Principles
The California Electrician Exam often includes questions on the fundamental differences between AC and DC, especially regarding their applications (e.g., household vs. battery power) and how they are measured. Be prepared to identify common AC and DC sources and loads.
Fundamentals of Electrical Theory
AC/DC Circuits and Basic Electrical Principles
Confusing AC and DC applications, especially when connecting sensitive electronics.
Fundamentals of Electrical Theory
AC/DC Circuits and Basic Electrical Principles
Not understanding that an 'open circuit' means no current flow, even if voltage is present.
Fundamentals of Electrical Theory
AC/DC Circuits and Basic Electrical Principles
Ignoring safety precautions when working with AC, assuming it's 'just like' DC.
Fundamentals of Electrical Theory
Voltage Drop
Reduction in voltage along a conductor due to resistance.
Fundamentals of Electrical Theory
Circular Mil (CM)
Unit of area for conductors, equal to the area of a circle with a diameter of 1 mil.
Fundamentals of Electrical Theory
K Factor
Resistivity constant for conductor material (e.g., copper, aluminum).
Fundamentals of Electrical Theory
Derating
Reducing a conductor's ampacity due to adverse conditions like high ambient temperature or bundling.
Fundamentals of Electrical Theory
Feeder
Circuit conductors between the service equipment and the branch-circuit overcurrent device.
Fundamentals of Electrical Theory
Branch Circuit
Circuit conductors between the final overcurrent device and the outlets.
Fundamentals of Electrical Theory
Voltage Drop and Conductor Sizing
VD = 2KIL/CM. Think 'Very Dumb Kid In Love with a Crazy Monster' for the single-phase formula components.
Fundamentals of Electrical Theory
Voltage Drop and Conductor Sizing
The California Electrician Exam heavily emphasizes NEC Article 310 for conductor sizing and ampacity, and you will encounter voltage drop calculations. Memorize the voltage drop formulas and know the K factors for copper and aluminum. Be prepared to apply derating factors from NEC tables.
Fundamentals of Electrical Theory
Voltage Drop and Conductor Sizing
Forgetting to use the one-way circuit length (L) in voltage drop calculations.
Fundamentals of Electrical Theory
Voltage Drop and Conductor Sizing
Not applying derating factors for ambient temperature or number of conductors when determining ampacity.
Fundamentals of Electrical Theory
Voltage Drop and Conductor Sizing
Confusing the 3% recommended voltage drop for general circuits with the 5% for motor circuits.
Fundamentals of Electrical Theory
Voltage Drop and Conductor Sizing
Failing to check both ampacity and voltage drop; sometimes a wire sized for ampacity is too small for voltage drop.
Fundamentals of Electrical Theory
Blueprint
Detailed technical drawing of a design.
Fundamentals of Electrical Theory
Legend
Key explaining symbols and abbreviations.
Fundamentals of Electrical Theory
Scale
Ratio of drawing size to actual size.
Fundamentals of Electrical Theory
Symbol
Standardized graphic for electrical components.
Fundamentals of Electrical Theory
Floor Plan
Overhead view of a building's layout.
Fundamentals of Electrical Theory
Schematic Diagram
Illustrates circuit connections logically.
Fundamentals of Electrical Theory
Title Block
Contains project info, dates, and revisions.
Fundamentals of Electrical Theory
Dimension Line
Indicates specific measurements on a drawing.
Fundamentals of Electrical Theory
Blueprint Reading and Electrical Symbols
LEGEND is your 'LEG' to 'END' confusion: Always check the legend to understand what symbols mean before you begin work.
Fundamentals of Electrical Theory
Blueprint Reading and Electrical Symbols
The California exam may present a partial blueprint and ask you to identify a specific symbol, count fixtures, or determine the type of circuit protection required for a given area. Pay attention to the legend and any notes.
Fundamentals of Electrical Theory
Blueprint Reading and Electrical Symbols
Ignoring the legend: Symbols can vary between projects; always check the specific blueprint's legend.
Fundamentals of Electrical Theory
Blueprint Reading and Electrical Symbols
Not checking the scale: Misinterpreting distances can lead to incorrect material orders and installation errors.
Fundamentals of Electrical Theory
Blueprint Reading and Electrical Symbols
Overlooking notes and annotations: Critical details about installation methods or material types are often found in small print.
Fundamentals of Electrical Theory
Raceway
Enclosed channel for wires, cables, or busbars.
Wiring Methods and Materials Mastery
Conduit
A type of raceway; rigid or flexible tubing.
Wiring Methods and Materials Mastery
Conduit Fill
Maximum percentage of raceway area occupied by conductors.
Wiring Methods and Materials Mastery
EMT
Electrical Metallic Tubing; light-gauge conduit.
Wiring Methods and Materials Mastery
RMC
Rigid Metal Conduit; heavy-duty, threaded conduit.
Wiring Methods and Materials Mastery
Conduit Body
Fitting with removable cover for access or changes in direction.
Wiring Methods and Materials Mastery
Box Fill
Volume required in a box for conductors, devices, and fittings.
Wiring Methods and Materials Mastery
Fittings
Components connecting raceways to boxes or other raceways.
Wiring Methods and Materials Mastery
Raceways, Boxes, Fittings, and Conduit Fill
Remember 'RACER' for raceway types: RMC, Aluminum (rigid), Conduit (PVC), EMT, and Rigid (IMC).
Wiring Methods and Materials Mastery
Raceways, Boxes, Fittings, and Conduit Fill
The California Electrical Code (CEC) generally adopts the NEC with specific amendments. Pay close attention to local amendments regarding seismic bracing for raceways and specific material requirements for certain installations, which might differ from the general NEC. Always check local AHJ requirements.
Wiring Methods and Materials Mastery
Raceways, Boxes, Fittings, and Conduit Fill
Overfilling conduit, leading to damaged insulation and overheating.
Wiring Methods and Materials Mastery
Raceways, Boxes, Fittings, and Conduit Fill
Not properly supporting raceways, causing sagging and potential damage.
Wiring Methods and Materials Mastery
Raceways, Boxes, Fittings, and Conduit Fill
Using incorrect box sizes for the number of conductors and devices.
Wiring Methods and Materials Mastery
Raceways, Boxes, Fittings, and Conduit Fill
Failing to bond metallic raceways, creating a shock hazard.
Wiring Methods and Materials Mastery
Cable
Assembly of insulated conductors in a jacket.
Wiring Methods and Materials Mastery
Flexible Cord
Cord for temporary wiring or portable equipment.
Wiring Methods and Materials Mastery
NM-B Cable
Nonmetallic-sheathed cable for dry, concealed locations.
Wiring Methods and Materials Mastery
AWG
American Wire Gauge, conductor size standard.
Wiring Methods and Materials Mastery
Conductors, Cables, Flexible Cords, and Ampacity
To remember derating factors: 'N.A.C.' - Number of conductors, Ambient temperature, Continuous loads. If you have N.A.C. problems, you need to derate!
Wiring Methods and Materials Mastery
Conductors, Cables, Flexible Cords, and Ampacity
The California Electrical Code (CEC) generally adopts the NEC with specific amendments. Pay close attention to any California-specific modifications to ampacity tables or conductor usage, especially concerning renewable energy systems or particular types of construction not explicitly covered by the NEC's general rules. Keywords to spot: 'California amendments,' 'Title 24,' 'CEC.'
Wiring Methods and Materials Mastery
Conductors, Cables, Flexible Cords, and Ampacity
Using the 90°C ampacity column when the terminals are rated for 75°C or 60°C, leading to undersized conductors for the termination.
Wiring Methods and Materials Mastery
Conductors, Cables, Flexible Cords, and Ampacity
Forgetting to apply derating factors for multiple conductors in a raceway or high ambient temperatures, resulting in overheating.
Wiring Methods and Materials Mastery
Conductors, Cables, Flexible Cords, and Ampacity
Using flexible cords for permanent wiring or in applications where they are subject to physical damage, violating NEC rules.
Wiring Methods and Materials Mastery
Splice
Joining two or more conductors to create a continuous electrical path.
Wiring Methods and Materials Mastery
Termination
Connecting a conductor to an electrical device or component.
Wiring Methods and Materials Mastery
Wire Nut
Insulated connector used to join multiple conductors by twisting.
Wiring Methods and Materials Mastery
Crimp Connector
Terminal or splice applied with a specialized tool for a gas-tight connection.
Wiring Methods and Materials Mastery
Torque
Rotational force applied to tighten a fastener, often specified by manufacturers.
Wiring Methods and Materials Mastery
NEC 110.14(B)
Code section requiring secure and insulated conductor splices.
Wiring Methods and Materials Mastery
NEC 300.15
Code section requiring splices and terminations to be in approved enclosures.
Wiring Methods and Materials Mastery
Splices, Terminations, and Support Requirements
S.T.S. - Splices, Terminations, Support. Remember, Safety Through Security!
Wiring Methods and Materials Mastery
Splices, Terminations, and Support Requirements
Pay close attention to NEC Article 110.14 (Electrical Connections) and Article 300.11 (Securing and Supporting) for specific distances and methods. Questions often involve identifying correct wire stripping lengths or support intervals for common cable types like NM or AC.
Wiring Methods and Materials Mastery
Splices, Terminations, and Support Requirements
Leaving bare copper exposed beyond the insulation of a splice or termination.
Wiring Methods and Materials Mastery
Splices, Terminations, and Support Requirements
Over-tightening or under-tightening screw terminals, damaging the wire or causing a loose connection.
Wiring Methods and Materials Mastery
Splices, Terminations, and Support Requirements
Not supporting cables within the required distance of boxes or at specified intervals.
Wiring Methods and Materials Mastery
Hazardous Location
Areas with flammable gases, dusts, or fibers.
Wiring Methods and Materials Mastery
Class I
Location where flammable gases or vapors are present.
Wiring Methods and Materials Mastery
Division 1
Hazardous material present under normal operating conditions.
Wiring Methods and Materials Mastery
Explosion-Proof
Equipment designed to contain internal explosions.
Wiring Methods and Materials Mastery
Intrinsically Safe
System limiting energy to prevent ignition of hazards.
Wiring Methods and Materials Mastery
Sealing Fitting
Device preventing passage of gases/vapors in conduit.
Wiring Methods and Materials Mastery
Pressurization
Maintaining positive pressure to exclude hazardous substances.
Wiring Methods and Materials Mastery
Wiring in Hazardous Locations and Special Conditions
To remember the Classes: 'Gases' (Class I), 'Dusts' (Class II), 'Fibers' (Class III) – GDF! Think 'Good Day, Friend' for the order of increasing hazard type.
Wiring Methods and Materials Mastery
Wiring in Hazardous Locations and Special Conditions
The California Electrical Code (CEC) adopts NEC Article 500-517 for hazardous locations, and Article 547 for agricultural buildings, often with minor state-specific amendments. Pay close attention to any California amendments that might modify equipment listing requirements or specific installation practices for these areas. For example, some local fire marshals may have stricter interpretations or require additional documentation for hazardous area installations.
Wiring Methods and Materials Mastery
Wiring in Hazardous Locations and Special Conditions
Using general-purpose wiring methods (e.g., EMT, NM cable) in hazardous locations.
Wiring Methods and Materials Mastery
Wiring in Hazardous Locations and Special Conditions
Failing to install proper sealing fittings in conduit runs entering or leaving hazardous areas.
Wiring Methods and Materials Mastery
Wiring in Hazardous Locations and Special Conditions
Not verifying the specific Class, Division, and Group rating before selecting equipment.
Wiring Methods and Materials Mastery
Wiring in Hazardous Locations and Special Conditions
Ignoring the unique environmental challenges in special conditions like agricultural buildings.
Wiring Methods and Materials Mastery
Continuous Load
Load operating for 3 hours or more at a time.
Wiring Methods and Materials Mastery
Correction Factor
Multiplier for ambient temperature effect on ampacity.
Wiring Methods and Materials Mastery
Adjustment Factor
Multiplier for number of current-carrying conductors.
Wiring Methods and Materials Mastery
kcmil
Thousand circular mils, unit for larger conductor sizes.
Wiring Methods and Materials Mastery
Selecting and Sizing Wiring Materials
To remember the factors affecting ampacity: 'T-I-C-A': Temperature, Insulation, Conductor count, Area (size).
Wiring Methods and Materials Mastery
Selecting and Sizing Wiring Materials
An official exam-objective tip for this lesson: The California Electrical Code (CEC) often includes amendments to NEC tables, especially regarding ampacity and derating factors. Always consult the specific CEC version for any local modifications to NEC 310.15(B)(2)(a) or 310.15(C)(1) for ambient temperature and conductor count adjustments.
Wiring Methods and Materials Mastery
Selecting and Sizing Wiring Materials
Forgetting to apply the 125% rule for continuous loads when sizing overcurrent protection and conductors.
Wiring Methods and Materials Mastery
Selecting and Sizing Wiring Materials
Ignoring ambient temperature or the number of conductors in a raceway, leading to undersized wiring.
Wiring Methods and Materials Mastery
Selecting and Sizing Wiring Materials
Neglecting voltage drop calculations on long circuit runs, resulting in poor system performance.
Wiring Methods and Materials Mastery
Selecting and Sizing Wiring Materials
Using the 60°C or 75°C column of Table 310.16 for a conductor with 90°C insulation when the terminations are only rated for 75°C.
Wiring Methods and Materials Mastery
Overcurrent
Any current exceeding the rated current of equipment or conductor.
Electrical Equipment and Devices
Overload
Operation of equipment in excess of its normal, full-load rating.
Electrical Equipment and Devices
Short Circuit
An abnormal connection between two points of different potential.
Electrical Equipment and Devices
Ground Fault
An unintentional electrical path between a phase conductor and ground.
Electrical Equipment and Devices
Fuse
An OCPD with a fusible link that melts to open the circuit.
Electrical Equipment and Devices
Circuit Breaker
A reusable OCPD that automatically opens a circuit during an overcurrent.
Electrical Equipment and Devices
Disconnecting Means
A device to disconnect conductors from their source of supply.
Electrical Equipment and Devices
Overcurrent Protection and Disconnecting Means
Fuses are like 'Fired Once, Replaced.' Circuit breakers are 'Can Be Reset.' Disconnects 'Definitely Cut Power.'
Electrical Equipment and Devices
Overcurrent Protection and Disconnecting Means
The California Electrical Code (CEC) adopts the NEC with specific amendments. For overcurrent protection, pay close attention to local amendments regarding GFCI and AFCI requirements in dwelling units and specific commercial occupancies. The exam often tests on the general NEC rules, but being aware of California-specific additions for these devices is crucial.
Electrical Equipment and Devices
Overcurrent Protection and Disconnecting Means
Oversizing an OCPD for a conductor, which can lead to conductor overheating and fire.
Electrical Equipment and Devices
Overcurrent Protection and Disconnecting Means
Not providing a readily accessible disconnecting means within sight of equipment, violating NEC safety standards.
Electrical Equipment and Devices
Overcurrent Protection and Disconnecting Means
Failing to properly lock out/tag out a disconnecting means before working on equipment.
Electrical Equipment and Devices
Single-Pole Switch
Controls a load from one location.
Electrical Equipment and Devices
Three-Way Switch
Used in pairs to control a load from two locations.
Electrical Equipment and Devices
Four-Way Switch
Controls a load from three or more locations.
Electrical Equipment and Devices
Receptacle
An outlet for connecting portable electrical equipment.
Electrical Equipment and Devices
GFCI
Ground-Fault Circuit Interrupter for shock protection.
Electrical Equipment and Devices
AFCI
Arc-Fault Circuit Interrupter for fire protection.
Electrical Equipment and Devices
Luminaire
A complete lighting unit, or light fixture.
Electrical Equipment and Devices
Switches, Re Receptacles, and Luminaires
For Receptacle Spacing: 'Six Feet Apart' – remember that no point along a wall should be more than 6 feet from a receptacle (meaning 12 feet between receptacles).
Electrical Equipment and Devices
Switches, Re Receptacles, and Luminaires
The California Electrical Code (CEC) generally adopts the NEC with some amendments. Pay close attention to specific California amendments regarding smoke and carbon monoxide detector requirements, which often integrate with luminaire and receptacle circuits, and energy efficiency standards for lighting controls.
Electrical Equipment and Devices
Switches, Re Receptacles, and Luminaires
Incorrectly wiring three-way or four-way switches, leading to improper light control.
Electrical Equipment and Devices
Switches, Re Receptacles, and Luminaires
Failing to install GFCI or AFCI protection where required by the NEC, risking shock or fire.
Electrical Equipment and Devices
Switches, Re Receptacles, and Luminaires
Overfilling electrical boxes, which can cause overheating and violate code.
Electrical Equipment and Devices
Appliance
Utilization equipment, typically non-industrial, performing functions.
Electrical Equipment and Devices
Motor FLA
Motor Full-Load Amperes, current drawn at rated load.
Electrical Equipment and Devices
Overload Protection
Protects motor from overheating due to excessive current.
Electrical Equipment and Devices
Transformer
Device changing AC voltage/current via induction.
Electrical Equipment and Devices
Autotransformer
Transformer with a single winding for primary and secondary.
Electrical Equipment and Devices
Service Factor
Motor's ability to handle temporary overloads.
Electrical Equipment and Devices
Appliances, Motors, and Transformers
To remember motor protection elements: 'SOCS' – Short-circuit, Overload, Control, and Starting. (Okay, 'Starting' isn't protection, but it helps remember the 'C' for Control!)
Electrical Equipment and Devices
Appliances, Motors, and Transformers
The California Electrical Code (CEC) generally adopts the NEC. For motors, pay close attention to Article 430, specifically sizing of conductors, overcurrent protection, and disconnects. The exam often tests on the calculation of motor branch-circuit short-circuit and ground-fault protection.
Electrical Equipment and Devices
Appliances, Motors, and Transformers
Incorrectly sizing motor overcurrent protection based on the wrong percentage of FLA or using general conductor ampacity tables instead of Article 430.
Electrical Equipment and Devices
Appliances, Motors, and Transformers
Forgetting to provide a readily accessible disconnecting means for fixed appliances rated over 300 VA or 1/8 HP.
Electrical Equipment and Devices
Appliances, Motors, and Transformers
Not understanding the difference between primary and secondary overcurrent protection requirements for transformers.
Electrical Equipment and Devices
Generator
Device converting mechanical to electrical energy.
Electrical Equipment and Devices
Transfer Switch
Device isolating generator from utility, preventing backfeeding.
Electrical Equipment and Devices
Control Device
Component managing electrical flow to equipment.
Electrical Equipment and Devices
Utilization Equipment
Equipment using electrical energy for work.
Electrical Equipment and Devices
Motor Starter
Device to start/stop motors and provide overload protection.
Electrical Equipment and Devices
Contactor
Heavy-duty relay for switching high-current loads.
Electrical Equipment and Devices
Backfeeding
Dangerous flow of power from generator to utility grid.
Electrical Equipment and Devices
Generators, Control Devices, and Utilization Equipment
GUTS: Generators, Utilization, Transfer switches, and Safety – remember these core concepts for this lesson!
Electrical Equipment and Devices
Generators, Control Devices, and Utilization Equipment
The California Electrician Certification Exam frequently tests on the requirements for standby and emergency generators, particularly regarding transfer switches and grounding. Pay close attention to NEC Articles 700, 701, and 702, and the specific grounding requirements in Article 250 for separately derived systems.
Electrical Equipment and Devices
Generators, Control Devices, and Utilization Equipment
Failing to install a transfer switch when connecting a generator to a building's wiring.
Electrical Equipment and Devices
Generators, Control Devices, and Utilization Equipment
Improperly sizing overcurrent protection for motors or other utilization equipment.
Electrical Equipment and Devices
Generators, Control Devices, and Utilization Equipment
Neglecting to properly ground a generator, especially a separately derived system.
Electrical Equipment and Devices
Stator
The stationary part of an electric motor.
Motor Control and Theory
Rotor
The rotating part of an electric motor.
Motor Control and Theory
Overload Relay
Protective device against excessive motor current.
Motor Control and Theory
Holding Circuit
Maintains power to a contactor after button release.
Motor Control and Theory
Electromagnetism
Principle of magnetic fields created by electric current.
Motor Control and Theory
Full-Load Amps (FLA)
Current drawn by a motor at rated horsepower.
Motor Control and Theory
Motor Theory and Control Circuits
To remember the basic motor parts: 'S'tator is 'S'tationary, 'R'otor 'R'otates. It's that simple!
Motor Control and Theory
Motor Theory and Control Circuits
The California exam frequently tests knowledge of motor control circuit diagrams (ladder diagrams). Be prepared to identify components, trace current paths, and understand the sequence of operation for start/stop circuits and basic reversing circuits.
Motor Control and Theory
Motor Theory and Control Circuits
Incorrectly wiring normally open (NO) and normally closed (NC) contacts, leading to circuits that don't start or can't be stopped.
Motor Control and Theory
Motor Theory and Control Circuits
Setting overload relays incorrectly, either too high (no protection) or too low (nuisance tripping).
Motor Control and Theory
Motor Theory and Control Circuits
Failing to understand the sequence of operation in a control circuit, especially the role of holding contacts.
Motor Control and Theory
Inrush Current
High current drawn by a motor at the moment of starting.
Motor Control and Theory
Thermal Overload
Overload protection using heat-sensitive elements to trip.
Motor Control and Theory
Reduced Voltage Starter
Limits starting current by applying less than full voltage initially.
Motor Control and Theory
Motor Starters and Overload Protection
O-L-D: OverLoad Damage. Remember that OverLoad protection prevents motor Damage.
Motor Control and Theory
Motor Starters and Overload Protection
The California exam frequently tests on NEC Article 430, particularly the sizing of overload protection based on motor nameplate FLA and service factor. Memorize the tables and exceptions for continuous duty motors.
Motor Control and Theory
Motor Starters and Overload Protection
Confusing overload protection with short-circuit protection (fuses/breakers). They serve different purposes.
Motor Control and Theory
Motor Starters and Overload Protection
Incorrectly sizing overload relays based on circuit breaker size instead of motor FLA.
Motor Control and Theory
Motor Starters and Overload Protection
Ignoring the motor's service factor when calculating overload settings, leading to nuisance trips or inadequate protection.
Motor Control and Theory
Within Sight
Visible and not more than 50 feet from the equipment.
Motor Control and Theory
Full-Load Current (FLC)
Current drawn by a motor operating at rated horsepower.
Motor Control and Theory
Branch-Circuit Conductors
Wires supplying power from OCPD to the motor controller.
Motor Control and Theory
Overcurrent Protection Device (OCPD)
Protects against short circuits and ground faults.
Motor Control and Theory
Motor Controller
Device that controls the motor's starting, stopping, and speed.
Motor Control and Theory
Lockable Disconnect
A disconnect switch that can be secured in the OFF position.
Motor Control and Theory
Motor Disconnecting Means and Branch Circuits
DISCO for Disconnect: D-istance (within sight/lockable), I-solation (of motor/controller), S-afety (for maintenance), C-apacity (rated for motor), O-vercurrent (protection coordination).
Motor Control and Theory
Motor Disconnecting Means and Branch Circuits
For motor branch-circuit conductors, remember the 125% rule is a minimum. Always round up to the next standard wire size that meets or exceeds this ampacity. Pay close attention to the specific motor type (single-phase, three-phase) and voltage in exam questions when looking up FLC values in NEC tables.
Motor Control and Theory
Motor Disconnecting Means and Branch Circuits
Failing to install a disconnect within sight or a lockable one if out of sight.
Motor Control and Theory
Motor Disconnecting Means and Branch Circuits
Confusing motor overload protection with branch-circuit short-circuit and ground-fault protection.
Motor Control and Theory
Motor Disconnecting Means and Branch Circuits
Using the motor nameplate current for conductor sizing instead of the FLC from NEC tables for continuous duty.
Motor Control and Theory
Motor Feeder
Circuit supplying power from service to motor branch OCPD.
Motor Control and Theory
Variable Frequency Drive (VFD)
Electronic device controlling motor speed by varying frequency/voltage.
Motor Control and Theory
Harmonics
Distorted waveforms in electrical systems, often from VFDs.
Motor Control and Theory
Rectifier
VFD component converting AC input to DC.
Motor Control and Theory
Inverter
VFD component converting DC to variable AC for the motor.
Motor Control and Theory
Electromagnetic Interference (EMI)
Electrical noise generated by VFDs affecting other equipment.
Motor Control and Theory
Motor Feeders and Variable Frequency Drives
VFD: Very Fast Drive, also Voltage, Frequency, Drive! Remember it controls all three.
Motor Control and Theory
Motor Feeders and Variable Frequency Drives
The California Electrical Code (CEC) adopts the NEC with specific amendments. For motor feeders and VFDs, pay close attention to Article 430 and any local amendments regarding conductor sizing, overcurrent protection, and harmonic mitigation requirements, as these can sometimes be more stringent.
Motor Control and Theory
Motor Feeders and Variable Frequency Drives
Under-sizing feeder conductors by not applying the 125% rule to the largest motor.
Motor Control and Theory
Motor Feeders and Variable Frequency Drives
Using standard motor cables for VFD applications, leading to premature insulation failure or EMI issues.
Motor Control and Theory
Motor Feeders and Variable Frequency Drives
Ignoring harmonic mitigation when installing multiple VFDs, causing power quality problems.
Motor Control and Theory
Class I Location
Contains flammable gases or vapors.
Special Occupancies and Conditions
Class II Location
Contains combustible dusts.
Special Occupancies and Conditions
Class III Location
Contains ignitable fibers or flyings.
Special Occupancies and Conditions
Division 2
Hazardous materials are present only under abnormal conditions.
Special Occupancies and Conditions
Essential Electrical System
Backup power system for critical loads in health care facilities.
Special Occupancies and Conditions
Hospital-Grade Receptacle
Receptacle with enhanced durability and grounding reliability for healthcare.
Special Occupancies and Conditions
Hazardous Locations and Health Care Facilities
To remember the Classes: 'Gases' (Class I) 'Dust' (Class II) 'Fibers' (Class III) – GDF. Think of a 'Good Darn Fire' hazard!
Special Occupancies and Conditions
Hazardous Locations and Health Care Facilities
The California Electrical Code (CEC) adopts NEC Article 517 with some state-specific amendments, particularly regarding seismic bracing and additional requirements for OSHPD (Office of Statewide Health Planning and Development) regulated facilities. Always check Title 24, Part 3 for specific California modifications to health care facility wiring.
Special Occupancies and Conditions
Hazardous Locations and Health Care Facilities
Using general-purpose equipment in a hazardous location without proper safeguards.
Special Occupancies and Conditions
Hazardous Locations and Health Care Facilities
Failing to install proper seals in conduit runs in Class I locations.
Special Occupancies and Conditions
Hazardous Locations and Health Care Facilities
Not understanding the difference between general care and critical care areas in health care facilities.
Special Occupancies and Conditions
Place of Assembly
Location for 100+ persons, specific wiring rules.
Special Occupancies and Conditions
Shore Power
Electrical supply for boats at marinas.
Special Occupancies and Conditions
Equipotential Bonding
Connecting metal parts to reduce voltage gradients.
Special Occupancies and Conditions
GFCI Protection
Device protecting against ground faults, critical in wet areas.
Special Occupancies and Conditions
Electric Shock Drowning (ESD)
Shock from voltage gradients in water, especially marinas.
Special Occupancies and Conditions
Underwater Luminaire
Lighting fixture designed for use underwater in pools.
Special Occupancies and Conditions
Accessible Disconnecting Means
Switch or breaker allowing quick power cutoff.
Special Occupancies and Conditions
Special Occupancies: Assembly, Marinas, Pools
AMP up safety! Assembly (A), Marinas (M), Pools (P) all require special attention to prevent hazards.
Special Occupancies and Conditions
Special Occupancies: Assembly, Marinas, Pools
The California Electrical Code (CEC) largely adopts NEC Articles 518, 555, and 680. Pay close attention to the specific distances for GFCI protection around pools and the bonding requirements for metal parts, as these are frequently tested.
Special Occupancies and Conditions
Special Occupancies: Assembly, Marinas, Pools
Using standard wiring methods (e.g., exposed NM cable) in places of assembly.
Special Occupancies and Conditions
Special Occupancies: Assembly, Marinas, Pools
Failing to provide GFCI protection for all required receptacles near pools or at marinas.
Special Occupancies and Conditions
Special Occupancies: Assembly, Marinas, Pools
Not properly bonding all metal parts around a pool or in a marina environment.
Special Occupancies and Conditions
Temporary Wiring
Electrical installations permitted for limited periods and specific purposes.
Special Occupancies and Conditions
Emergency System
Legally required power for life safety, with fast automatic transfer.
Special Occupancies and Conditions
Legally Required Standby
Power for systems preventing hazards or aiding rescue, slower transfer.
Special Occupancies and Conditions
Optional Standby
Non-mandated power for convenience or economic protection.
Special Occupancies and Conditions
Temporary Installations and Emergency Systems
For Emergency, Legally Required, Optional systems, think ELO: Emergency is life-safety (10s), Legally Required is hazard prevention (60s), Optional is just for convenience (no time limit).
Special Occupancies and Conditions
Temporary Installations and Emergency Systems
The California Electrical Code (CEC) generally adopts NEC Articles 590, 700, 701, and 702 with few state-specific amendments. Pay close attention to the 10-second transfer time for emergency systems (Article 700) and the 60-second transfer for legally required standby systems (Article 701). Memorize the GFCI requirements for temporary 125V, 15/20A receptacles.
Special Occupancies and Conditions
Temporary Installations and Emergency Systems
Failing to provide GFCI protection for all required temporary receptacles.
Special Occupancies and Conditions
Temporary Installations and Emergency Systems
Not ensuring complete wiring separation for emergency and legally required standby systems.
Special Occupancies and Conditions
Temporary Installations and Emergency Systems
Improperly sizing or installing transfer switches, leading to backfeeding hazards.
Special Occupancies and Conditions
PLFA Circuit
Power-Limited Fire Alarm circuit, limited power, less stringent wiring.
Special Occupancies and Conditions
NPLFA Circuit
Nonpower-Limited Fire Alarm circuit, follows general wiring methods.
Special Occupancies and Conditions
Article 760
NEC article covering fire alarm systems.
Special Occupancies and Conditions
Article 690
NEC article covering solar photovoltaic systems.
Special Occupancies and Conditions
Rapid Shutdown
De-energizes PV array conductors quickly for safety.
Special Occupancies and Conditions
Dedicated Branch Circuit
A circuit serving only one piece of equipment.
Special Occupancies and Conditions
Circuit Integrity
Ability of a circuit to continue functioning during a fault.
Special Occupancies and Conditions
Fire Alarm & Solar Photovoltaic Systems
For Fire Alarms, think '760 is a Fire Hazard number.' For Solar PV, think '690 is Sunny and Hot.'
Special Occupancies and Conditions
Fire Alarm & Solar Photovoltaic Systems
Pay close attention to specific California amendments regarding rapid shutdown requirements (e.g., California Residential Code R324) and any local fire department requirements that may exceed NEC minimums for both fire alarm and PV systems. The exam often tests on these local variations.
Special Occupancies and Conditions
Fire Alarm & Solar Photovoltaic Systems
Failing to separate fire alarm circuits from power circuits, leading to interference or compromised integrity.
Special Occupancies and Conditions
Fire Alarm & Solar Photovoltaic Systems
Incorrectly sizing overcurrent protection devices for DC PV circuits, which can cause equipment damage or fire.
Special Occupancies and Conditions
Fire Alarm & Solar Photovoltaic Systems
Neglecting rapid shutdown requirements for PV systems, endangering emergency responders.
Special Occupancies and Conditions
Fire Alarm & Solar Photovoltaic Systems
Using incorrect cable types for fire alarm or PV systems that are not rated for the application or environment.
Special Occupancies and Conditions
Grounding Electrode Conductor (GEC)
Connects service to grounding electrode system.
Grounding and Bonding Essentials
Equipment Grounding Conductor (EGC)
Provides fault path for non-current-carrying parts.
Grounding and Bonding Essentials
System Grounding
Connecting the electrical system to earth.
Grounding and Bonding Essentials
Equipment Grounding
Connecting metal enclosures to the earth via EGC.
Grounding and Bonding Essentials
Ufer Ground
Concrete-encased electrode, typically rebar.
Grounding and Bonding Essentials
Ground Rod
Metal rod driven into the earth for grounding.
Grounding and Bonding Essentials
Grounding Electrode Systems and Equipment Grounding
GEC connects to the G.E.S. (Grounding Electrode System). EGC protects the E.Q.U.I.P.ment.
Grounding and Bonding Essentials
Grounding Electrode Systems and Equipment Grounding
The California Electrical Code (CEC) adopts the NEC with some amendments. For grounding electrode systems, pay close attention to local utility requirements for connection points and specific types of electrodes, as these can sometimes be more stringent than the NEC minimums. Always check with the Authority Having Jurisdiction (AHJ) for any local variations.
Grounding and Bonding Essentials
Grounding Electrode Systems and Equipment Grounding
Using an undersized grounding electrode conductor (GEC) or equipment grounding conductor (EGC).
Grounding and Bonding Essentials
Grounding Electrode Systems and Equipment Grounding
Not bonding all available grounding electrodes together to form a complete system.
Grounding and Bonding Essentials
Grounding Electrode Systems and Equipment Grounding
Making splices in the GEC where not permitted, or using unapproved connectors.
Grounding and Bonding Essentials
Bonding
Permanent joining of metallic parts to form a conductive path.
Grounding and Bonding Essentials
Fault Current
Unintended current flowing through an abnormal path.
Grounding and Bonding Essentials
Bonding Jumper
Conductor ensuring electrical conductivity between metal parts.
Grounding and Bonding Essentials
Main Bonding Jumper
Connects neutral to service enclosure and EGC at service.
Grounding and Bonding Essentials
Low-Impedance Path
A circuit path designed to allow high current flow quickly.
Grounding and Bonding Essentials
Overcurrent Protective Device
A device like a circuit breaker or fuse that opens a circuit.
Grounding and Bonding Essentials
Bonding and Fault Current Paths
Think of 'Bonding' as 'Bringing Objects Near, Done Safely.' It's about connecting things together for safety.
Grounding and Bonding Essentials
Bonding and Fault Current Paths
The California Electrician Exam frequently tests the distinction between grounding and bonding, and the specific requirements for bonding various metallic systems (e.g., water pipes, gas pipes, structural steel) to the electrical service. Pay close attention to NEC Article 250 sections on bonding jumpers and methods.
Grounding and Bonding Essentials
Bonding and Fault Current Paths
Confusing bonding with grounding: Grounding connects to the earth; bonding connects metal parts together.
Grounding and Bonding Essentials
Bonding and Fault Current Paths
Not properly sizing bonding jumpers: Undersized jumpers won't safely conduct fault current.
Grounding and Bonding Essentials
Bonding and Fault Current Paths
Failing to bond all required metallic systems: Leaving out water pipes or gas lines creates shock hazards.
Grounding and Bonding Essentials
Separately Derived System
Power source with no direct connection to service conductors, with its own GEC.
Grounding and Bonding Essentials
Neutral-to-Ground Bond
Connection between the neutral and equipment grounding conductor.
Grounding and Bonding Essentials
Lightning Protection System
System to protect structures from lightning strikes.
Grounding and Bonding Essentials
Air Terminal
Part of a lightning protection system that intercepts strikes.
Grounding and Bonding Essentials
Down Conductor
Connects air terminal to grounding electrode in lightning protection.
Grounding and Bonding Essentials
Separately Derived Systems & Lightning Protection
Separate Systems = Separate Grounding. Remember the 'S' for both: Separately Derived Systems need their own Source-side grounding.
Grounding and Bonding Essentials
Separately Derived Systems & Lightning Protection
The California Electrical Code (CEC) adopts the NEC with some amendments. For separately derived systems, pay close attention to Article 250.30. The exam will test your ability to identify when a system is separately derived and apply the correct grounding and bonding rules at the source.
Grounding and Bonding Essentials
Separately Derived Systems & Lightning Protection
Failing to make the neutral-to-ground bond at the source of the separately derived system.
Grounding and Bonding Essentials
Separately Derived Systems & Lightning Protection
Treating a separately derived system's grounding like a branch circuit, rather than a service.
Grounding and Bonding Essentials
Separately Derived Systems & Lightning Protection
Not establishing a proper grounding electrode conductor for the separately derived system.
Grounding and Bonding Essentials
Grounding
Connecting to earth to limit voltage.
Grounding and Bonding Essentials
Ground-Fault Current Path
Low-impedance path for fault current.
Grounding and Bonding Essentials
Grounding Electrode
Conductor providing connection to earth.
Grounding and Bonding Essentials