Plain definitions of 35 terms we use on the job in Victoria.
Term Index
Open any term below for a dedicated definition page.
An arc-fault circuit interrupter is a protective device that monitors electrical current for patterns linked to unintended arcing. The device opens the circuit when it detects a dangerous arc signature. This action can reduce the risk of wiring damage and electrical fires caused by loose connections, damaged insulation, or worn conductors.
Also called: AFCI
Ballast is a component in some fluorescent and high-intensity discharge light fixtures that controls electrical current through the lamp. A ballast helps the lamp start, maintains stable operation, and limits current after ignition. Older fixtures often use magnetic ballasts, while newer systems may use electronic ballasts designed for specific lamp types.
Battery Energy Storage is a power system that stores electricity in rechargeable batteries and releases that energy when needed. The system connects to a building’s electrical equipment through power conversion and control equipment. Home installations can supply selected critical circuits during an outage, helping keep essential loads operating when utility power is unavailable.
Also called: Home Battery
A bidirectional inverter is a power-conversion device that moves electrical energy in either direction between direct-current sources, such as a battery, and an alternating-current building system. The device converts battery power for household loads and converts building or charging power back into battery-compatible energy. Control settings manage each operating direction.
Bonding is the intentional connection of conductive electrical parts so they remain at a similar electrical potential. The connection creates a low-impedance path for fault current, helping protective devices respond when energized conductors contact metal enclosures, piping, or other conductive surfaces. Bonding works with grounding but serves a different function.
Also called: Electrical Bonding
A busbar is a conductive metal strip or bar that distributes electrical power to multiple circuits inside equipment such as a panelboard. The busbar connects incoming power with circuit breaker positions, allowing each breaker to receive power from a common supply point. Insulating supports keep the energized metal separated from the enclosure.
Also called: Bus Bar
Carbon Monoxide Sensor is a device component that detects carbon monoxide in the surrounding air and sends a signal when the gas reaches a sensed level. The sensor supports an alarm or monitoring system. Unlike a complete carbon monoxide detector, a sensor may not include the alarm, display, battery, or housing.
Also called: CO Sensor
A Ceiling Fan Capacitor is an electrical component that stores and releases energy to help a ceiling fan motor start, run, and change speed. The capacitor creates a phase shift between motor windings, which supports rotation and speed control. A weak or failed capacitor can cause humming, slow operation, or limited fan speeds.
Conduit is a protective raceway that carries and shields electrical wires or cables. Electricians install conduit along walls, ceilings, underground paths, and other routes where wiring needs physical protection or an organized path. Conduit may be made from metal or plastic, and its size and fittings must suit the wiring and installation conditions.
Also called: Electrical Conduit
A continuity test is an electrical check that determines whether a complete conductive path exists between two points. A meter sends a small test signal through the path and indicates whether current can pass. Electricians use the result to identify open wires, broken connections, faulty switches, and interrupted circuit paths during troubleshooting.
Also called: Continuity Check
A Critical Loads Panel is a separate electrical panel that supplies selected circuits during a utility outage or backup power event. The panel connects chosen loads to a battery system through appropriate switching and distribution equipment. It keeps essential circuits organized, limits backup demand, and separates supported loads from circuits that remain on normal utility power.
Also called: Backup Loads Panel
Current Draw is the amount of electrical current a device or circuit takes from its power source while operating. Current draw describes the electrical demand placed on wiring, breakers, power supplies, and other components. Technicians assess it alongside voltage and equipment ratings when investigating overloads, performance problems, or unexpected electrical behavior.
Also called: Amperage Draw
A dimmer switch is a wall control that adjusts the electrical power delivered to a compatible light fixture, allowing you to change light output from brighter to softer. Unlike a standard on-off switch, a dimmer provides variable lighting levels. Compatibility depends on the dimmer design, fixture type, lamp, and wiring arrangement.
Also called: Light Dimmer
Electrical Load is the amount of power that connected devices and equipment draw from an electrical system at a given time. The load includes lighting, receptacles, appliances, heating and cooling equipment, and other circuits. Electricians assess it to determine whether the service, panel, feeders, and wiring can support the connected demand.
Also called: Load Demand
A feeder is a circuit that carries power from a service disconnect or distribution panel to another panel, equipment group, or building area. A feeder includes ungrounded conductors and may include a neutral and equipment grounding conductor. Its size and protection depend on the electrical load, conductor length, and installation conditions.
Also called: Feeder Wire
A fuse is an overcurrent protection device that contains a metal element designed to melt when electrical current exceeds its rated limit. The melted element opens the circuit and stops current from reaching downstream wiring and equipment. A fuse must be replaced after operation because the protective element cannot be reset.
A ground fault is an unintended electrical path between an energized conductor and grounded material, such as a metal box, appliance frame, or wet surface. The fault diverts current away from its intended circuit path and can create shock, fire, or equipment hazards when protective devices do not interrupt the circuit.
Also called: Earth Fault
A grounding electrode is a conductive object that connects an electrical system to the earth. The electrode may be installed in soil or incorporated into a building’s foundation. Its connection provides a path for unwanted electrical energy and supports the grounding system during faults, surges, and other abnormal conditions.
Also called: Ground Rod
A junction box is an enclosed electrical container that protects wire connections where circuit conductors meet, split, or change direction. The box provides a controlled space for splices and helps keep connections accessible for inspection and future servicing. Junction boxes may be metal or nonmetallic and can be installed in walls, ceilings, attics, or exposed locations.
Also called: Electrical Junction Box
An LED driver is an electronic power supply that regulates electricity for light-emitting diodes. The driver converts incoming power into the voltage or current the LED fixture needs. It also helps maintain steady light output when normal electrical conditions change. A driver may be built into a lamp or installed as a separate component.
Also called: LED Power Supply
Line Voltage is the electrical potential supplied by a power source to a circuit, equipment, or building wiring system. Line voltage powers devices such as lighting, receptacles, motors, and heating equipment. The term distinguishes source voltage from lower control voltage used by thermostats, relays, doorbells, and similar control components.
Also called: Mains Voltage
A Load Center is an enclosure that receives electrical power and distributes it through circuit breakers to branch circuits. It usually contains a busbar, neutral connections, and grounding connections. The load center protects wiring by allowing breakers to interrupt circuits when current exceeds the circuit’s design capacity.
Also called: Breaker Panel
A neutral wire is a current-carrying conductor that completes an electrical circuit by returning current from a load to the service panel. It normally connects to the grounded neutral point at the electrical service. Neutral wires commonly serve receptacles, switches, lights, and appliances, but they are not interchangeable with equipment grounding conductors.
Also called: Neutral Conductor
A photocell is a light-sensitive electrical control that switches outdoor lighting on or off as surrounding brightness changes. It helps fixtures operate during dark conditions and remain off during daylight. Photocells commonly support automatic control for porch lights, security lights, pathway fixtures, and landscape lighting without requiring someone to operate a switch.
Also called: Photo Sensor
A photoelectric sensor is a light-based detection component that responds when particles or an object changes the light reaching a receiver. In smoke detectors, the sensor monitors a chamber for light scattered by smoke. The sensor then signals the alarm circuit. This operating method differs from ionization sensing, which responds to changes in an electrical current.
Also called: Photoelectric Smoke Sensor
Power Factor is a measure of how effectively an electrical system converts supplied power into useful work. The value compares real power used by equipment with apparent power carried by the circuit. Motors, transformers, and other inductive loads can lower power factor by causing current and voltage to fall out of step.
A recessed housing is the enclosure installed above a ceiling or behind a finished surface to hold a recessed light’s electrical connections and lamp or LED components. The housing supports the fixture, protects wiring, and helps the light fit the ceiling assembly. Housing type must match the fixture, ceiling, and installation conditions.
Also called: Can Light Housing
A service entrance is the point where electrical power enters a building from the utility system and connects to the building’s main electrical equipment. It includes the conductors, raceway or cable, meter connection, and related equipment that carry electricity to the service panel. The service entrance forms the boundary between utility supply and premises wiring.
Also called: Electrical Service Entrance
A surge protector is an electrical device that limits a sudden rise in voltage and redirects excess energy away from connected equipment. A surge protector may serve one receptacle or an entire electrical system. Whole-home models connect at the service equipment and help reduce damage from surges entering through utility lines or other connected wiring.
Also called: Surge Suppressor
A Tamper-Resistant Receptacle is an electrical outlet with internal shutters that block access to the energized contact openings. The shutters open when matching pressure is applied to both openings at once. This design helps prevent objects from entering one opening and reaching live electrical parts, while preserving normal plug use.
Also called: TR Receptacle
A Transfer Switch is an electrical switching device that connects selected building circuits to an alternate power source, such as a portable generator. The device directs those circuits to one source at a time and separates the alternate source from utility power. This arrangement supports controlled backup power for chosen loads during an outage.
Also called: Generator Transfer Switch
Voltage Drop is the reduction in electrical pressure that occurs as current travels through a conductor and connected components. The reduction results from resistance in the circuit. Excessive voltage drop can prevent equipment from receiving the voltage it needs, causing dim lights, weak motor performance, nuisance shutdowns, or unreliable operation.
A weatherproof box is an electrical enclosure designed to protect wire connections, switches, receptacles, or lighting controls installed outdoors. Its cover, fittings, and seals limit exposure to rain, moisture, dirt, and physical contact. The box supports safe, organized connections while allowing approved devices and wiring methods to function in exterior locations.
Also called: Outdoor Electrical Box
A Wire Connector is an insulated device that joins electrical conductors and keeps the connection secure. Common types include twist-on connectors, push-in connectors, and crimp connectors. The connector must match the conductors, connection method, and enclosure. A properly installed connector creates a continuous electrical path while reducing exposure to contact and moisture.
Also called: Wire Nut
Wire Gauge is a standardized way to describe a conductor’s diameter and current-carrying capacity. The gauge identifies how thick the metal conductor is, while insulation type, installation conditions, and circuit demand also affect proper wire selection. Smaller gauge numbers generally indicate thicker conductors, but electrical work must match the complete circuit design.
Also called: AWG
