UT Electrician key terms

A model code published by the National Fire Protection Association that gives minimum requirements for the safe installation of electrical wiring and equipment; Utah adopts it with state amendments as enforceable law.

The organization, office, or individual responsible for approving equipment, installations, and procedures and for enforcing the electrical code in an area, often a city or county building department.

Equipment, materials, or services included in a published list by a nationally recognized testing laboratory, showing the item has been tested and found to meet a designated standard.

Equipment or material that carries an attached label, symbol, or other identifying mark from a recognized testing laboratory indicating it complies with appropriate standards, applied by that agency.

The relationship stating that voltage equals current multiplied by resistance (E = I x R), used to find any one of the three values when the other two are known.

The ratio of true power in watts to apparent power in volt-amperes in an alternating-current circuit; a value of 1.0 means voltage and current are perfectly in phase.

The reduction in voltage along conductors caused by their impedance and the current they carry; excessive drop can make equipment operate poorly and is limited by good design practice.

The maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

The ratio of the maximum demand of a system, or part of it, to the total connected load; used to size services and feeders based on expected use rather than everything running at once.

A load in which the maximum current is expected to continue for three hours or more; conductors and overcurrent devices serving it are generally sized at 125 percent of the load.

A factory assembly of two or more insulated conductors enclosed in an overall nonmetallic, flame-retardant jacket; widely used for residential branch circuits and required to be protected from physical damage where necessary.

A thin-walled metal raceway with a smooth interior through which conductors are pulled; it is joined with couplings and connectors and must be secured and supported as the code requires.

An enclosed channel of metal or nonmetallic material designed expressly for holding wires, cables, or busbars, such as conduit, tubing, or wireway.

The comparison of a box's calculated volume with the total volume required by the conductors, devices, fittings, and grounds it contains; a box must have enough cubic inches for its contents.

A device such as a fuse or circuit breaker that opens a circuit automatically when current exceeds a set value, protecting conductors and equipment from overheating.

A device that detects a small difference between current leaving and returning on a circuit and quickly opens the circuit to prevent shock; required in bathrooms, kitchens, outdoors, and other wet or damp areas.

A device that monitors a circuit for the signature of dangerous arcing and opens the circuit; required for most dwelling-unit branch circuits supplying outlets in rooms such as bedrooms and living areas.

The circuit conductors that carry power from the service equipment or another supply source to the final branch-circuit overcurrent devices, such as the conductors between a main panel and a subpanel.

The circuit conductors between the final overcurrent device protecting the circuit and the outlet or outlets it serves, such as the wiring from a breaker to the receptacles in a room.

A circuit conductor that is intentionally connected to ground, commonly called the neutral; in a standard 120/240-volt system it carries return current and is identified by white or gray insulation.

The conductive path installed to connect normally non-current-carrying metal parts of equipment to the system grounded conductor or the grounding electrode system, giving fault current a low-impedance path.

The conductor that connects the system grounded conductor, equipment, or both to the grounding electrode, such as the wire run from a service neutral to a ground rod.

A reliable conductor that ensures electrical continuity between metal parts that must be electrically connected, such as the main bonding jumper between the neutral and equipment ground at the service.

A wiring system whose power comes from a source with no direct electrical connection to the supply conductors, such as a transformer secondary or a generator, and that is generally grounded and bonded as a new source.

A complete lighting unit consisting of a light source and the parts needed to position, protect, and connect it, including the lamp, housing, reflector, and ballast or driver.

A single panel or group of panel units assembled in a cabinet with buses and automatic overcurrent devices, used to distribute and control power to branch circuits or feeders.

The current a motor draws when running at its rated horsepower, voltage, and speed under full load; for code calculations it is usually taken from code tables rather than the motor nameplate.

A device such as a thermal relay or heater that senses excessive current in a motor circuit and opens the control circuit to protect the motor from sustained overheating, separate from short-circuit protection.

A multiplier on a motor nameplate showing how much the motor can be overloaded continuously under rated conditions without damage; a service factor of 1.15 means 115 percent of rated load.

A switch or other device that opens all circuit conductors to a motor and its controller so the equipment can be safely serviced, usually sized at least 115 percent of the motor full-load current.

An area where fire or explosion hazards may exist because of flammable gases, vapors, dusts, or fibers; equipment installed there must be approved and marked for the class, division or zone, and group.

An installation location subject to saturation with water or other liquids, such as uncovered outdoor areas or the inside of a shower; wiring methods and equipment there must be approved for wet conditions.

A circuit supplied from a source with limited power output, such as a low-voltage transformer or power supply, that is considered low energy and carries reduced wiring and protection requirements.

A circuit that carries information-bearing signals, such as telephone, data, or cable television signals, rather than supplying power, and is covered by the code's communications provisions.

The state agency that licenses electricians and electrical contractors in Utah, administers examinations, issues and renews licenses, and enforces the state's professional licensing statutes and rules.

The portion of Utah Code, Title 58 Chapter 55, that sets licensing requirements for construction trades, including electricians and electrical contractors, and gives the state authority to regulate them.

In Utah, the highest level of electrician license, permitting the holder to perform and supervise electrical work of the trade and to serve as the qualifying party for an electrical contractor business.

In Utah, a licensed electrician who has completed the required experience and examination and may install, maintain, and repair electrical systems, typically working under a master electrician or contractor.

Ongoing training hours that Utah electricians must complete before renewing a license, covering code updates and safety topics, earned through approved course providers and reported to the state.