Plain definitions of 35 terms we use on the job in Miami.
Term Index
Open any term below for a dedicated definition page.
Arc-Fault Circuit Interrupter is a protective device that detects electrical arcing and interrupts power before an arc can damage wiring or connected equipment. An arc can occur when current jumps across a damaged, loose, or deteriorated connection. The device monitors the circuit for the electrical pattern associated with arcing and disconnects the circuit when that pattern appears.
Also called: AFCI
An Automatic Transfer Switch is an electrical switching device that moves a connected load from normal utility power to a standby generator when utility power fails. The switch monitors the incoming supply, starts or signals the generator through compatible controls, and returns the load to utility power after normal service is restored.
Also called: ATS
Backstab Connection is a wiring method that holds a solid conductor in a spring-loaded terminal at the rear of an electrical receptacle or switch. The connection avoids the side screw terminal, but its holding force depends on the terminal design and wire condition. Electricians inspect it during outlet repair and wiring troubleshooting.
Also called: Push-In Connection
A branch circuit is a wiring path that carries electricity from a distribution panel to outlets, lighting, appliances, or other connected loads. The circuit includes conductors, overcurrent protection, and connected devices. Its capacity and wiring method must match the equipment it serves, the building layout, and the conditions of the installation.
A busbar is a rigid metal conductor inside an electrical panel that distributes power to circuit breakers and connected circuits. Unlike an individual wire, a busbar provides a shared connection point for multiple breakers. Insulating supports, panel covers, and clearances help keep the conductor positioned and separated from grounded metal.
Also called: Bus Bar
A capacitor is an electrical component that stores and releases energy in a circuit. In a ceiling fan, the capacitor helps create the phase difference needed for the motor’s windings to produce starting force and maintain rotation. Its condition can affect starting, speed control, and smooth operation.
Also called: Fan Capacitor
A Carbon Monoxide Alarm is a life-safety device that detects carbon monoxide in indoor air and gives an audible warning when the gas reaches a dangerous condition. Carbon monoxide is colorless and odorless, so the alarm provides warning that human senses cannot provide. The device may operate from batteries, building wiring, or both.
Also called: Carbon Monoxide Detector, CO Alarm
A ceiling fan downrod is a rigid metal tube that suspends a ceiling fan below its mounting surface. The downrod connects the fan motor to the ceiling canopy and mounting bracket. Its length sets the fan’s hanging height, which can improve clearance, appearance, and air movement in rooms with taller ceilings.
Also called: Fan Downrod
Circuit Tracer is a diagnostic tool that identifies which electrical circuit supplies a specific outlet, switch, fixture, or appliance. The tool sends a detectable signal through the circuit, then uses a receiver to locate that signal at a panel or wiring point. This process helps match field devices with their controlling breakers.
Also called: Circuit Finder
A conduit is a protective channel that routes and shields electrical conductors. Conduit may be made from metal or nonmetallic material, and it can run through walls, ceilings, outdoor areas, or exposed spaces. The channel helps protect wiring from physical damage while supporting an organized electrical installation.
Also called: Electrical Conduit
Copper Pigtail is a short copper conductor used to connect an aluminum wire to a compatible electrical device or wiring connection. The pigtail creates a copper termination at the device while the aluminum conductor remains joined through an approved connector. Proper installation depends on compatible materials, correct preparation, and a secure connection.
Also called: Copper Jumper
A dimmer switch is a wall control that adjusts the brightness of compatible light fixtures by regulating electrical power sent to the lamps. Unlike a standard light switch, which provides simple on and off control, a dimmer supports adjustable lighting levels. Compatibility depends on the switch, fixture, lamp type, and wiring.
Also called: Light Dimmer
Equipotential Bonding is an electrical connection that joins accessible conductive parts so they remain at nearly the same electrical potential. The connection helps limit voltage differences between metal components that a person could touch at the same time. In pool systems, bonding commonly connects conductive parts to create a shared electrical reference.
Also called: Equipotential Bonding Grid
EV Load Management is a control method that balances electric vehicle charging with the available capacity of a home’s electrical system. It monitors electrical demand and adjusts charging power when other equipment needs priority. The method can help coordinate an EV charger with backup power, household circuits, and bidirectional energy flow.
Also called: Electric Vehicle Load Management
A generator inlet is a permanently installed connection point that receives power from a portable generator and routes it into a building’s electrical system through approved wiring. The inlet usually sits outdoors and connects to a transfer switch or interlock, allowing selected circuits to receive backup power without running an extension cord through a door or window.
Also called: Generator Inlet Box
Ground-Fault Circuit Interrupter is a protective electrical device that disconnects power when current leaves its intended path, such as through a person or a damaged appliance. A GFCI monitors outgoing and returning current, then trips quickly when the amounts differ. It commonly protects receptacles in damp or wet locations.
Also called: GFCI
A grounding electrode is a conductive connection between an electrical system and the earth. Common forms include metal underground water piping, concrete-encased electrodes, and ground rods. The electrode provides a path for electrical energy during certain fault or surge conditions, while grounding conductors connect system equipment to the grounding electrode system.
Also called: Ground Electrode
A Hot Tub Disconnect is a dedicated switching device that lets you turn power to a hot tub off at a location near the equipment. The disconnect supports safer servicing and emergency shutoff. It may include overcurrent protection or work alongside a circuit breaker and ground-fault protection in the hot tub wiring system.
Also called: Spa Disconnect
Junction Box is an enclosed electrical enclosure that protects and contains connections where wires join, split, or change direction. The box provides space for approved connectors and keeps the splice accessible for inspection and service. A cover closes the enclosure, while cables enter through openings designed for the wiring method.
Also called: Electrical Junction Box
Landscape Lighting Transformer is a device that changes household voltage into lower-voltage power for outdoor lighting systems. The transformer connects to a power source and sends controlled power through landscape lighting cables. It may include timer or photocell controls, allowing path lights, accent lights, and other fixtures to operate on a planned schedule.
Also called: Low-Voltage Lighting Transformer
Level 2 Charging is a method of electric vehicle charging that uses higher-voltage alternating current than a standard household receptacle. An onboard vehicle charger converts that power for the battery. Level 2 equipment supports faster home charging and usually requires a properly sized branch circuit, suitable wiring, and compatible charging equipment.
Also called: Level 2 EV Charging
Load Calculation is an engineering assessment that estimates the electrical demand a property places on its service and distribution equipment. The assessment reviews existing circuits, fixed appliances, heating and cooling equipment, and planned additions. Electricians use the result to judge whether a panel and service can support the expected demand without unsafe overloading.
Also called: Electrical Load Calculation
A NEMA 14-50 Outlet is a receptacle designed for equipment that uses a matching NEMA 14-50 plug. The outlet has two energized slots, a neutral slot, and a grounding connection. Electric vehicle charging equipment commonly uses this configuration, although compatibility depends on the charger plug and the vehicle’s charging system.
Also called: 14-50 Receptacle
A neutral wire is a current-carrying conductor that provides the return path for electricity in many alternating-current circuits. It connects the load back to the electrical panel and normally stays near ground potential. The neutral wire works with a hot wire to complete a circuit, while a grounding conductor serves a different protective purpose.
Also called: Neutral Conductor
A photocell is a light-sensitive electrical control that switches outdoor lighting on when surrounding light becomes low and off when daylight returns. The device responds to ambient light, so fixtures can operate without manual switching. Photocells are commonly installed with landscape, security, parking, and other exterior lighting systems.
Also called: Dusk-to-Dawn Sensor, Photoelectric Sensor
Pool Bonding is the electrical connection of conductive metal parts around a swimming pool, spa, or related equipment. The connection helps place metal components at a similar electrical potential, which can reduce voltage differences between surfaces a person could touch. Bonding commonly involves pool shells, reinforcing steel, ladders, handrails, metal piping, and equipment enclosures.
Also called: Pool Equipotential Bonding
Recessed Light Housing is the structural enclosure that holds a recessed light fixture above or within a ceiling. The housing supports the light source, connects to the electrical wiring, and separates the fixture from surrounding building materials. Its design must match the ceiling construction, fixture type, and installation location.
Also called: Can Light Housing
Service Entrance Cable is a factory-assembled electrical cable that carries utility power from the service point to a building’s main electrical equipment. The cable contains insulated conductors and a protective covering suited to its installation. Electricians select its construction and size based on the service design, routing method, and equipment connection.
Also called: SE Cable
A smoke alarm is a self-contained device that detects smoke particles and produces an audible warning of a possible fire. It may use photoelectric or ionization sensing, and some models combine both methods. Smoke alarms can receive power from batteries, building wiring, or both, depending on the installation and model.
Also called: Smoke Detector
A Surge Protective Device is an electrical protection component that limits temporary voltage surges and directs excess energy away from connected wiring and equipment. Installed at a panel or other suitable point, the device helps reduce damage from events such as utility disturbances, switching activity, and nearby lightning. It does not replace circuit breakers.
Also called: SPD, Surge Protector
A Tamper-Resistant Receptacle is an electrical outlet with internal shutters that block access to the energized contacts unless a plug applies pressure to both openings at once. The design helps prevent objects from entering one opening, while preserving normal plug operation. It is commonly installed in homes, offices, and other occupied spaces.
Also called: Tamper-Resistant Outlet, TR Receptacle
Transfer Switch Interlock is a mechanical or listed electrical device that coordinates a generator connection with a building’s utility supply. The interlock permits the generator source to feed selected circuits only when the utility source is disconnected. Its main purpose is to prevent both power sources from being connected to the panel at the same time.
Also called: Generator Interlock Kit
Voltage Drop is a reduction in electrical voltage that occurs as current travels through a conductor, connection, or circuit component. The reduction leaves less voltage available at the load than at the source. Excessive voltage drop can affect equipment operation, cause dim lighting, and point to wiring, connection, or circuit design problems.
Also called: Voltage Loss
Wire Gauge is a sizing system that indicates a wire’s conductor diameter and current-carrying capacity. The gauge number describes the conductor size, while the wire material and insulation also affect the correct application. Electricians use gauge information to match wiring with circuit demands, protect equipment, and support safe electrical repairs.
Also called: Wire Size
A wire nut is a twist-on connector that joins compatible electrical wires inside an enclosure. Its internal spring grips the conductors as the cap turns, creating a compact connection that helps keep wire ends together. Wire nuts come in different sizes and materials, so the connector must match the wire type and connection.
Also called: Twist-On Wire Connector
