Browse 30 essential 24 hour electrician terms and definitions used by professionals in Santa Ana.
Term Index
Open any term below for a dedicated definition page.
Alternating Current is electric current that repeatedly changes direction and varies in magnitude over time. Most utility power uses alternating current because transformers can change its voltage efficiently for transmission and building service. In North America, household power commonly operates at 60 hertz, meaning the current completes 60 cycles each second.
Ampacity is the maximum current, measured in amperes, that a conductor can carry continuously under stated conditions without exceeding its temperature rating. The value depends on conductor material, wire size, insulation rating, ambient temperature, installation method, and nearby conductors. Electrical codes use ampacity to select safe wiring and overcurrent protection.
Amperage is the amount of electric current flowing through a circuit, measured in amperes or amps. Amperage describes the rate of charge movement. While voltage provides the electrical pressure that drives current. A circuit's wire size, protective device, and connected equipment must support the expected amperage to operate safely.
Arc-Fault Circuit Interrupter is a protective device that detects dangerous electrical arcing in a circuit and disconnects power before the arc can ignite nearby materials. An AFCI monitors current patterns for irregular signals caused by damaged, loose, or pinched wiring. AFCI protection helps reduce fire risk in residential branch circuits.
AWG is the American Wire Gauge system used to identify the diameter and cross-sectional area of electrical wire. The system assigns smaller numbers to thicker conductors and larger numbers to thinner conductors. AWG helps electricians select wire for current capacity, voltage drop, terminals, conduit space, and equipment connections.
Branch Circuit is the wiring between the final overcurrent device, such as a circuit breaker, and the outlets, lights, or equipment it supplies. A branch circuit includes the circuit conductors, grounding path, and connected loads. Common ratings include 15, 20, 30, and 50 amperes, selected for the load and wire size.
Busbar is a rigid conductor made from copper or aluminum that distributes electrical power within a panelboard, switchboard, switchgear assembly, or other equipment. Busbars may be bare or insulated and usually have a rectangular, tubular, or solid form. Their size, material, spacing, and temperature rating determine safe current capacity.
CALGreen is California's mandatory green building code for covered residential and nonresidential construction. It establishes statewide requirements for water efficiency, indoor air quality, material conservation, waste reduction, energy-related features, and electric vehicle readiness. The California Building Standards Commission publishes the code. While local building departments review plans and verify compliance.
Conduit is a tube or channel that protects and routes insulated electrical conductors. It may be made from metal, PVC, or other approved materials. Electricians select conduit by location, environmental exposure, conductor count, wire size, and required protection. Proper installation also supports grounding, physical protection, maintenance, and compliance with electrical codes.
Continuous Load is an electrical load expected to operate at its maximum current for three hours or longer. The National Electrical Code requires conductors and overcurrent devices to account.125 percent of the continuous portion, plus noncontinuous loads. Examples include lighting, electric vehicle charging, heating equipment, and commercial refrigeration.
Current is the movement of electric charge through a conductor, device, or circuit. Current is measured in amperes, often called amps, and results when voltage creates an electrical pressure across a path. The amount depends on voltage and resistance. Current may be direct or alternating, and excessive current can overheat conductors or damage equipment.
Electrical Grounding is a safety system that connects electrical equipment and circuits to earth or a grounding network. The connection provides a controlled path for fault current. Helping protective devices trip during insulation failure. Grounding also stabilizes voltage and reduces shock, fire, and equipment damage risks when wiring faults occur.
Electrical Permit is an official authorization from a building department that allows specified electrical installation, alteration, repair, or replacement work to proceed. The permit identifies the project scope, applicable electrical code, responsible parties, and required inspections. Approval confirms submitted plans meet local requirements, but final compliance depends on completed work passing inspection.
Electrical Service is the complete system that delivers electricity from a utility connection to a building’s distribution equipment and circuits. The term also describes expert work that installs, repairs, tests, or maintains this system. Electrical service includes the service conductors, meter equipment, main disconnect, grounding, bonding, and electrical panel.
Electric Vehicle Supply Equipment is the equipment that safely delivers electrical power from a building or utility connection to an electric vehicle. EVSE includes charging equipment, control circuits, connectors, cables, communication functions, and protective devices. The equipment manages the charging connection but doesn't include the vehicle’s onboard battery charger.
Ground-Fault Circuit Interrupter is a protective device that monitors current flowing through a circuit and disconnects power when some current leaves the intended path. The device helps protect people from electric shock, especially near water. A GFCI may be installed as a receptacle, circuit breaker, or portable device.
Grounding Electrode is a conductive object that connects an electrical system to the earth. Common examples include metal underground water pipe, a concrete-encased electrode, and one or more ground rods. The electrode connects to the grounding electrode conductor. Which carries fault current or lightning-related energy toward earth and helps stabilize system voltage.
Load Calculation is the process of estimating the electrical demand that a building, panel, feeder, or service will place on an electrical system. The calculation considers connected equipment, expected operating patterns, continuous loads, and demand factors. Electricians and engineers use the result to select service size, conductors, breakers, and equipment safely.
National Electrical Code is a safety standard published by the National Fire Protection Association that sets minimum requirements for electrical design, installation, and inspection. The code covers wiring methods, grounding, overcurrent protection, equipment, and special locations. Local governments adopt and amend its requirements, so the enforceable rules can vary by jurisdiction.
Neutral Wire is a current-carrying conductor that normally returns electricity from a load to the service panel in a single-phase circuit. It connects to the grounded conductor at the service disconnect and usually carries near-zero voltage to ground. Neutral wires commonly use white or gray insulation, but color alone can't prove safe identification.
Ohm is the SI unit of electrical resistance, written with the symbol Ω. One ohm of resistance allows one ampere of current to flow when one volt is applied. The unit describes how strongly a material or device opposes current, helping electricians select conductors, test circuits, and identify abnormal resistance.
Overcurrent Protection is a safety function that stops or limits electrical current when it exceeds a circuit’s rated capacity. Fuses and circuit breakers provide this protection by opening the circuit during overloads or short circuits. Proper protection helps prevent overheated conductors, damaged equipment, fires, and unsafe electrical conditions.
Phase is the position of an alternating-current waveform within its repeating cycle. Measured as an angle in degrees. In electrical systems, phase also describes a separate energized conductor or waveform, such as one phase in a single-phase circuit or one of three phase conductors in a three-phase system. Phase relationships affect voltage, current, motor operation, and power delivery.
Raceway is a channel, tube, or enclosed path that protects and routes electrical conductors. Common raceways include metal conduit, PVC conduit, surface raceway, and wireways. A raceway may be installed inside walls, above ceilings, underground, or on exposed surfaces. Its size and material must suit the conductors, environment, and applicable electrical code.
Service Entrance is the part of an electrical system that connects the utility supply to a building’s service equipment. It includes service conductors, the service point, meter equipment, and the main disconnecting means. This connection delivers utility power to the premises and establishes where utility and customer electrical responsibilities typically meet.
Short Circuit is a unintended low-resistance path that allows excessive electrical current to flow between conductors at different voltages. The fault may occur between hot and neutral wires, between hot wires, or between a conductor and ground. Excess current can create heat, damage equipment, trip a breaker, or start an electrical fire.
THHN Wire is a thermoplastic-insulated electrical conductor rated for dry locations and commonly installed inside conduit or other raceways. The abbreviation means thermoplastic high-heat-resistant nylon-coated wire. THHN conductors often use copper or aluminum and carry markings for conductor size, voltage rating, temperature rating, and applicable safety listings.
UL Listing is a certification mark showing that Underwriters Laboratories has evaluated a product against specific safety requirements. The evaluation may include testing, construction review, and factory inspections. A listed product meets the conditions identified for its intended use, but the mark doesn't approve every installation or guarantee suitability for every electrical system.
Voltage is the electrical potential difference between two points. Measured in volts, voltage provides the pressure that moves electric charge through a circuit. A source such as a battery, transformer, or utility system creates voltage. The amount present affects equipment operation, power delivery, insulation requirements, and the risk of electric shock.
Wire Nut is a twist-on connector that joins two or more electrical conductors inside an approved enclosure. Made from insulating plastic with an internal metal spring. A wire nut grips properly stripped wires and creates a secure electrical path. Its size must match the wire type, gauge, number of conductors, and circuit conditions.
