Electrical Terms (ESPINAS, ELAINE) Flashcards
Preparation for the Long Quiz
Admitting close approach; not guarded by locked
doors, elevation, or other effective means.
Accessible (as applied to equipment).
Capable of being removed or exposed without damaging the building structure
Accessible (as applied to wiring methods)
Capable of being reached quickly for operation,
renewal, or inspections without requiring those to whom ready access is requisite to take
actions such as to use tools (other than keys), to climb over or under, to remove obstacles or to
resort to portable ladders, and so forth.
Accessible, Readily (Readily Accessible)
Power conversion equipment that provides a means of adjusting the
speed of an electric motor.
Adjustable Speed Drive.
The current, in amperes, that a conductor can carry continuously under the
conditions of use without exceeding its temperature rating.
Ampacity.
Utilization equipment, generally other than industrial, that is normally built in
standardized sizes or types and is installed or connected as a unit to perform one or more
functions such as clothes washing, air conditioning, food mixing, deep frying, and so forth
Appliance.
Equipment and materials; and installation, testing and commissioning methods, recognized as acceptable by local and international standards-setting organizations - properly equipped and qualified for testing, inspections of the run of goods at factories, and service-value determination through field inspections – and/or as permitted by relevant and applicable government regulatory codes
Approved
An example of government regulatory codes
Philippine Electrical Code, Part 1 and Part 2
A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media
Askarel
Apparatus in which the circuits are not necessarily intrinsically safe themselves but that affects the energy in the intrinsically safe circuits and is relied on to maintain intrinsic safety
Associated Apparatus [as applied to Hazardous (Classified) Locations]
Apparatus in which the circuits are not necessarily nonincendive themselves but that affect the energy in nonincendive field wiring circuits and are relied upon to maintain nonincendive energy levels
Associated Nonincendive Field Wiring Apparatus [as applied to Hazardous (Classified) Locations]
has designated associated nonincendive field wiring apparatus connections for nonincendive field wiring apparatus and may also have connections for other electrical apparatus.
Associated nonincendive field wiring apparatus
A device that, by insertion in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle.
Attachment Plug (Plug Cap) (Plug)
Performing a function without the necessity of human intervention.
Automatic
An area including a basin with one or more of the following: a toilet, a tub, or a shower.
Bathroom
Interconnected battery subsystems consisting of one or more storage batteries and battery chargers, and can include inverters, converters, and associated electrical equipment.
Battery System
Connected to establish electrical continuity and conductivity.
Bonded (Bonding)
A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected.
Bonding Conductor or Jumper
The connection between two or more portions of the equipment grounding conductor.
Bonding Jumper, Equipment
The connection between the grounded circuit conductor and the equipment grounding conductor at the service.
Bonding Jumper, Main
The connection between the grounded circuit conductor and the equipment grounding conductor at a separately derived system.
Bonding Jumper, System
The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).
Branch Circuit
A branch circuit that supplies energy to one or more outlets to which appliances are to be connected and that has no permanently connected luminaires that are not a part of an appliance.
Branch Circuit, Appliance
A branch circuit that supplies two or more receptacles or outlets for lighting and appliances.
Branch Circuit, General-Purpose
A branch circuit that supplies only one utilization equipment
Branch Circuit, Individual
A branch circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is
Branch Circuit, Multiwire
A structure that stands alone or that is separated from adjoining structures by fire walls.
Building
The government official appointed by the Secretary of the Department of Public Works and who is responsible for enforcing the provisions of the National Building Code of the Philippines (NBC) created under Presidential Decree 1096 (PD 1096) and its Implementing Rules and Regulations; and charged with the duties of issuing building permits, notices and certificates.
Building Official
The place of business of the Building Official where processing of permits, notices, certificates and other related documents are undertaken. Also referred to as OBO in this Code.
Building Official, Office of the
A licensed electrical practitioner employed in the Office of the Building Official responsible for overseeing electrical installations and equipment for compliance to provisions of the Philippine Electrical Code, Part 1 (PEC1), and for the approval of electrical permits and certificates issuances. Also referred to as OBO/EE in this Code.
Building Official/EE, Office of the
A Registered Master Electrician (RME), Registered Electrical Engineer (REE) or Professional Electrical Engineer (PEE) under Republic Act 7920 or national electrical engineering law with their respective duties and responsibilities. See definition of Licensed Electrical Practitioner.
Licensed electrical practitioner
An enclosure that is designed for either surface mounting or flush mounting and is provided with a frame, mat, or trim in which a swinging door or doors are or can be hung.
Cabinet
A single channel or connected multiple channels, as well as associated fittings, forming a structural system that is used to support and route communications wires and cables, optical fiber cables, data cables associated with information technology and communications equipment, Class 2, Class 3, and Type PLTC cables, and power-limited fire alarm cables in plenum, riser, and general-purpose applications.
Cable Routing Assembly
Equipment that controls dc voltage or dc current, or both, and that is used to charge a battery or other energy storage device.
Charge Controller
A device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating.
Circuit Breaker
can be integral, direct acting with the circuit breaker, or remote from the circuit breaker when properly applied within its rating.
automatic opening
A qualifying term indicating that the circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range.
Adjustable (as applied to circuit breakers)
A qualifying term indicating that no delay is purposely introduced in the tripping action of the circuit breaker
Instantaneous Trip (as applied to circuit breakers)
A qualifying term indicating that there is purposely introduced a delay in the tripping action of the circuit breaker, which delay decreases as the magnitude of the current increases.
Inverse Time (as applied to circuit breakers)
A qualifying term indicating that the circuit breaker does not have any adjustment to alter the value of current at which it will trip or the time required for its operation.
Nonadjustable (as applied to circuit breakers
The value of current, time, or both, at which an adjustable circuit breaker is set to trip.
Setting (of circuit breakers)
A nonhabitable room or space intended primarily for storage of garments and apparel
Clothes Closet
A cylindrical assembly composed of a conductor centered inside a metallic tube or shield, separated by a dielectric material, and usually covered by an insulating jacket.
Coaxial Cable.
Dust particles that are 500 microns or smaller (i.e., material passing a U.S. No. 35 Standard Sieve as defined in ASTM E11-2015, Standard Specification for Woven Wire Test SieveCloth and Test Sieves ), and present a fire or explosion hazard when dispersed and ignited in air.
Combustible Dust [as applied to Hazardous (Classified) Locations].
Standard Test Method for Explosibility of Dust Clouds, or ISO 6184-1, Explosion protection systems — Part 1: Determination of explosion indices of combustible dusts in air, for procedures for determining the explosibility of dusts.
ASTM E1226-2012a
A protection technique utilizing stationary gas detectors in industrial establishments.
Combustible Gas Detection System [as applied to Hazardous (Classified) Locations].
The electronic equipment that performs the telecommunications operations for the transmission of audio, video, and data, and includes power equipment (e.g., dc converters, inverters, and batteries), technical support equipment (e.g., computers), and conductors dedicated solely to the operation of the equipment.
Communications Equipment
A cable containing optical fibers and current-carrying electrical conductors.
Composite Optical Fiber Cable
Rendered inaccessible by the structure or finish of the building. Wires in concealed raceways are considered concealed, even though they may become accessible by withdrawing them.
Concealed
A factory assembly of one or more optical fibers having an overall covering and containing non–current-carrying conductive member(s) such as metallic strength member(s), metallic vapor barrier(s), metallic armor or metallic sheath.
Conductive Optical Fiber Cable
A conductor having no covering or electrical insulation whatsoever.
Conductor, Bare.
A conductor encased within material of composition or thickness that is not recognized by this Code as electrical insulation.
Conductor, Covered.
A conductor encased within material of composition and thickness that is recognized by this Code as electrical insulation.
Conductor, Insulated.
A separate portion of a conduit or tubing system that provides access through a removable cover(s) to the interior of the system at a junction of two or more sections of the system or at a terminal point of the system. Boxes such as FS and FD or larger cast or sheet metal boxes are not classified as conduit bodies.
Conduit Body.
A device that establishes a connection between two or more conductors or between one or more conductors and a terminal by means of mechanical pressure and without the use of solder.
Connector, Pressure (Solderless).
A load where the maximum current is expected to continue for 3 hours or more.
Continuous Load
The circuit of a control apparatus or system that carries the electric signals directing the performance of the controller but does not carry the main power current.
Control Circuit
The circuit of a control apparatus or system that carries the electric signals directing the performance of the controller but does not carry the main power current.
Control Circuit
A drawing or other document provided by the manufacturer of the intrinsically safe or associated apparatus, or of the nonincendive field wiring apparatus or associated nonincendive field wiring apparatus, that details the allowed interconnections between the intrinsically safe and associated apparatus or between the nonincendive field wiring apparatus or associated nonincendive field wiring apparatus.
Control Drawing [as applied to Hazardous (Classified) Locations
A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected
Controller
A cooking appliance designed for mounting in or on a counter and consisting of one or more heating elements, internal wiring, and built-in or mountable controls.
Cooking Unit, Counter-Mounted.
Localization of an overcurrent condition to restrict outages to the circuit or equipment affected, accomplished by the selection and installation of overcurrent protective devices and their ratings or settings for the full range of available overcurrents, from overload to the maximum available fault current, and for the full range of overcurrent protective device opening times associated with those overcurrent.
Coordination, Selective (Selective Coordination)
Conductors drawn from a copper-clad aluminum rod with the copper metallurgically bonded to an aluminum core, where copper forms a minimum of 10 percent of the cross-sectional area of a solid conductor or each strand of a stranded conductor.
Copper-Clad Aluminum Conductors
A fitting intended to terminate a cord to a box or similar device and reduce the strain at points of termination and may include an explosionproof, a dust- ignitionproof, or a flameproof seal.
Cord Connector [as applied to Hazardous (Classified) Locations].
An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the enclosure.
Cutout Box.
Without live parts exposed to a person on the operating side of the equipment.
Dead Front
The ratio of the maximum demand of a system, or part of a system, to the total connected load of a system or the part of the system under consideration.
Demand Factor
A unit of an electrical system, other than a conductor, that is intended to carry or control but not utilize electric energy.
Device
A device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply.
Disconnecting Means
Equipment enclosed in a manner that excludes dusts and does not permit arcs, sparks, or heat otherwise generated or liberated inside of the enclosure to cause ignition of exterior accumulations or atmospheric suspensions of a specified dust on or in the vicinity of the enclosure.
Dust-Ignition proof [as applied to Hazardous (Classified) Locations
Enclosures constructed so that dust will not enter the enclosing case under specified test conditions.
Dusttight
Operation at a substantially constant load for an indefinitely long time.
Duty, Continuous
operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest.
Duty, Intermittent
Intermittent operation in which the load conditions are regularly recurrent.
Duty, Periodic.
Operation at a substantially constant load for a short and definite, specified time.
Duty, Short-Time
Operation at loads, and for intervals of time, both of which may be subject to wide variation.
Duty, Varying
A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation.
Dwelling Unit.
A building that consists solely of one dwelling unit.
Dwelling, One-Family
A building that consists solely of two dwelling units.
Dwelling, Two-Family
A building that contains three or more dwelling units.
Dwelling, Multifamily
An intentionally constructed, low-impedance electrically conductive path designed and intended to carry current underground-fault conditions from the point of a guard fault on a wiring system to the electrical supply source and that facilitates the operation of the overcurrent protective device or ground0fault detectors.
Effective Ground-Fault Current Path
Power production, distribution, and utilization equipment and facilities, such as electric utility systems that deliver electric power to the connected loads, that are external to and not controlled by an interactive system.
Effective Power Production and Distribution Network
A fixed, stationary, or portable self- contained, electrically operated and/or electrically illuminated utilization equipment with words or symbols designed to convey information or attract attention.
Electric Sign
Systems of illumination utilizing fluorescent lamps, high-intensity discharge (HID) lamps, or neon tubing
Electric Discharged Lighting
A Registered Master Electrician (RME), Registered Electrical Engineer (REE) or Professional Electrical Engineer (PEE) who has a knowledge of electrical engineering and/ or training in electrical installations and practices, and has complied with the requirements of the Republic Act 7920 or national electrical engineering law.
Electrical Practitioner, Licensed.
An overcurrent protective device that generally consists of a control module that provides current-sensing, electronically derived time-current characteristics, energy to initiate tripping, and an interrupting module that interrupts current when an overcurrent occurs. Such fuses may or may not operate in a current-limiting fashion, depending on the type of control selected.
Electronically Actuated Fuse
Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts.
Enclosed
The case or housing of apparatus, or the fence or walls surrounding an installation to prevent personnel from accidentally contacting energized parts or to protect the equipment from physical damage.
Enclosure
Electrically connected to a source of voltage.
Energized
A general term including material, fittings, devices, appliances, luminaires, apparatus, and the like used as a part of, or in connection with, an electrical installation.
Equipment
Equipment enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby.
Explosion proof Equipment
Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to parts that are not suitably guarded, isolated, or insulated.
Exposed (as applied to live parts).
On or attached to the surface or behind panels designed to allow access.
Exposed (as applied to wiring methods).
Capable of being operated without exposing the operator to contact with live parts.
Externally Operable.
All circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device.
Feeder
A string of outdoor lights that is suspended between two points.
Festoon Lighting
An accessory such as a locknut, bushing, or other part of a wiring system that is intended primarily to perform a mechanical rather than an electrical function.
Fitting
A building or portion of a building in which one or more self-propelled vehicles can be kept for use, sale, storage, rental, repair, exhibition, or demonstration purposes.
Garage
The earth.
Ground
Connected (connecting) to earth or to some conducting body that serves in place of the earth.
Grounded (Grounding).
Connected to ground without inserting any resistor or impedance device.
Grounded, Solidly.
A system or circuit conductor that is intentionally grounded.
Grounded Conductor.
A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A device.
Ground-Fault Circuit Interrupter (GFCI)
An electrically conductive path from the point of a ground fault on a wiring system through normally non-current-carrying conductors, equipment, or the earth to electrical supply source.
Ground-Fault Current Path
A system intended to provide protection of equipment from damaging line-to-ground fault currents by operating to cause a disconnecting means to open all ungrounded conductors of the faulted circuit. This protection is provided at current levels less than those required to protect conductors from damage through the operation of a supply circuit overcurrent device.
Ground-Fault Protection of Equipment
The conductive path(s) that provides a ground-fault current path and connects normally non-current-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor, or both.
Grounding Conductor, Equipment (EGC)
A device that establishes an electrical connection to the earth.
Grounding Electrode
The conductor used to connect the grounding electrode(s) to the equipment grounding conductor, to the grounded conductor, or to both, at the service, at each building or structure where supplied by a feeder(s) or branch circuit(s), or at the source of a separately derived system.
Grounding Electrode Conductor.
Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger.
Guarded
An accommodation combining living, sleeping, sanitary, and storage facilities within a compartment.
Guest Room
An accommodation with two or more contiguous rooms comprising a compartment, with or without doors between such rooms, that provides living, sleeping, sanitary, and storage facilities.
Guest Suite.
An enclosure identified for use in underground systems, provided with an open or closed bottom, and sized to allow personnel to reach into, but not enter, for the purpose of installing, operating, or maintaining equipment or wiring or both.
Handhole Enclosure.
A combination consisting of a compressor and motor, both of which are enclosed in the same housing, with no external shaft or shaft seals, with the motor operating in the refrigerant.
Hermatic Refrigerant Motor-Compressor
Equipment sealed against the entrance of an exter‐ nal atmosphere where the seal is made by fusion, for example, soldering, brazing, welding, or the fusion of glass to metal.
Hermetically Sealed [as applied to Hazardous (Classified) Locations].
Any shaftway, hatchway, well hole, or other vertical opening or space in which an elevator or dumbwaiter is designed to operate.
Hoistway
A system comprised of multiple power sources.
Hybrid System
Recognizable as suitable for the specific purpose, function, use, environment, application, and so forth, where described in a particular Code requirement.
Identified (as applied to equipment)
Where this Code specifies that one equipment shall be “in sight from,” “within sight from,” or “within sight,” and so forth, of another equipment, the specified equipment is to be visible and not more than 15 m distant from the other.
In Sight From (Within Sight From, Within Sight).
An assembly of two or more components consisting of one of the following: (1) power circuit components only, such as motor controllers, overload relays, fused disconnect switches,
and circuit breakers; (2) control circuit components only, such as push buttons, pilot lights, selector switches, timers, switches, and control relays; (3) a combination of power and control circuit components. These components, with associated wiring and terminals, are mounted on, or contained within, an enclosure or mounted on a subpanel.
Industrial Control Panel.
Components of Industrial Control Panel
- Power Circuit Components
- Control Circuit Component
- Combination of Both
Equipment and systems rated 1000 volts or less, normally found in offices or other business establishments and similar environments classified as ordinary locations, that are used for creation and manipulation of data, voice, video, and similar signals that are not communications equipment as defined in Part 1.0.1 and do not process communications circuits as defined in 8.0.1.2.
Information Technology Equipment (ITE)
A nonmetallic raceway placed within a larger raceway.
Innerduct.
An inverter intended for use in parallel with an electric utility to supply common loads that may deliver power to the utility.
Interactive Inverter.
An electric power production system that is operating in parallel with and capable of delivering energy to an electric primary source supply system.
Interactive System.
The highest current at rated voltage that a device is intended to interrupt under standard test conditions.
Interrupting Rating
A device that provides a means for connecting intersystem bonding conductors for communications systems to the grounding electrode system.
Intersystem Bonding Termination
Apparatus in which all the circuits are intrinsically safe.
Intrinsically Safe Apparatus.
An assembly of interconnected intrinsically safe apparatus, associated apparatus, and interconnecting cables, in that those parts of the system that may be used in hazardous (classified) locations are intrinsically safe circuits.
Intrinsically Safe System [as applied to Hazardous (Classified) Locations]
Not readily accessible to persons unless special means for access are used.
Isolated (as applied to location)
An area with a sink and permanent provisions for food preparation and cooking.
Kitchen
Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is concerned with product evaluation, that maintains periodic inspection of production of labeled equipment or materials, and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner.
Labeled
An outlet intended for the direct connection of a lampholder, a luminaire (lighting fixture), or a pendant cord terminating in a lampholder.
Lighting Outlet
A manufactured assembly designed to support and energize luminaires that are capable of being readily repositioned on the track. Its length can be altered by the addition or subtraction of sections of track.
Lighting Track (Track Lighting).
Equipment, materials, or services included in a list published by an organization that is concerned with evaluation of products or services, that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services, and whose listing states that the equipment, material, or services either meets appropriate designated standards or has been tested and found suitable for a specified purpose.
Listed
Energized conductive components.
Live Parts.
Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture.
Location, Damp.
A location not normally subject to dampness or wetness. A location classified as dry may be temporarily subject to dampness or wetness, as in the case of a building under construction.
Location, Dry.
Installations underground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather.
Location, Wet.
A complete lighting unit consisting of a lamp or lamps together with the parts designed to distribute the light, to position and protect the lamps and ballast (where applicable), and to connect the lamps to the power supply.
Luminaire
Equipment with electrical components suitable to be moved only with mechanical aids or is provided with wheels for movement by person(s) or powered devices.
Mobile Equipment.
An assembly of one or more enclosed sections having a common power bus and principally containing motor control units.
Motor Control Center.
A type of surface, flush, or freestanding raceway designed to hold conductors and receptacles, assembled in the field or at the factory.
Multioutlet Assembly.
A law enacted by Congress providing for a more responsive and comprehensive regulation for the practice, licensing and registration of electrical engineers and electricians otherwise referred to as Republic Act 7920 (RA 7920) or a future law that supersedes it.
National Electrical Engineering Law
The conductor connected to the neutral point of a system that is intended to carry current under normal conditions.
Neutral Conductor.
The common point on a wye-connection in a polyphase system or midpoint on a single-phase, 3-wire system, or midpoint of a single-phase portion of a 3-phase delta system, or a midpoint of a 3-wire, direct-current system.
Neutral Point.
Requiring human intervention to perform a function.
Nonautomatic
A factory assembly of one or more optical fibers having an overall covering and containing no electrically conductive materials.
Nonconductive Optical Fiber Cable.
A circuit, other than field wiring, in which any arc or thermal effect produced under intended operating conditions of the equipment, is not capable, under specified test conditions, of igniting the flammable gas–air, vapor–air, or dust–air mixture.
Nonincendive Circuit [as applied to Hazardous (Classified) Locations]
A component having contacts for making or breaking an incendive circuit and the contacting mechanism is constructed so that the component is incapable of igniting the specified flammable gas–air or vapor–air mixture. The housing of a nonincendive component is not intended to exclude the flammable atmosphere or contain an explosion.
Nonincendive Component [as applied to Hazardous (Classified) Locations].
Equipment having electrical/ electronic circuitry that is incapable, under normal operating conditions, of causing ignition of a specified flammable gas–air, vapor–air, or dust–air mixture due to arcing or thermal means.
Nonincendive Equipment [as applied to Hazardous (Classified) Locations].
Wiring that enters or leaves an equipment enclosure and, under normal operating conditions of the equipment, is not capable, due to arcing or thermal effects, of igniting the flammable gas– air, vapor–air, or dust–air mixture. Normal operation includes opening, shorting, or grounding the field wiring.
Nonincendive Field Wiring [as applied to Hazardous (Classified) Locations]
Apparatus intended to be connected to nonincendive field wiring.
Nonincendive Field Wiring Apparatus
A load where the wave shape of the steady-state current does not follow the wave shape of the applied voltage.
Nonlinear Load.
Electrical equipment immersed in a protective liquid in such a way that an explosive atmosphere that may be above the liquid or outside the enclosure cannot be ignited.
Oil Immersion [as applied to Hazardous (Classified) Locations]
A factory assembly or field assembly of one or more optical fibers having an overall covering.
Optical Fiber Cable.
A point on the wiring system at which current is taken to supply utilization equipment.
Outlet
An arrangement of incandescent lamps, electric discharge lighting, or other electrically powered light sources to outline or call attention to certain features such as the shape of a building or the decoration of a window.
Outline Lighting.
Any current in excess of the rated current of equipment or the ampacity of a conductor. It may result from overload, short circuit, or ground fault.
Overcurrent.
A device capable of providing protection for service, feeder, and branch circuits and equipment over the full range of overcurrents between its rated current and its interrupting rating. Such devices are provided with interrupting ratings appropriate for the intended use but no less than 5000 amperes.
Overcurrent Protective Device, Branch-Circuit.
A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as luminaires and appliances. This limited protection is in addition to the protection provided in the required branch circuit by the branch- circuit overcurrent protective device.
Overcurrent Protective Device, Supplementary.
Operation of equipment in excess of normal, full-load rating, or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or dangerous overheating. A fault, such as a short circuit or ground fault, is not an overload.
Overload
A single panel or group of panel units designed for assembly in the form of a single panel, including buses and automatic overcurrent devices, and equipped with or without switches for the control of light, heat, or power circuits; designed to be placed in a cabinet or cutout box placed in or against a wall, partition, or other support; and accessible only from the front.
Panelboard
The total components and subsystem that, in combination, convert solar energy into electric energy suitable for connection to a utilization load.
Photovoltaic (PV) System.
A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system.
Plenum
Equipment with electrical components suitable to be moved by a single person without mechanical aids.
Portable Equipment.
An enclosed assembly that may include receptacles, circuit breakers, fuseholders, fused switches, buses, and watt-hour meter mounting means; intended to supply and control power to mobile homes, recreational vehicles, park trailers, or boats or to serve as a means for distributing power required to operate mobile or temporarily installed equipment.
Power Outlet.
That interior and exterior wiring, including power, lighting, control, and signal circuit wiring together with all their associated hardware, fittings, and wiring devices, both permanently and temporarily installed, that extends from the service point or source of power, such as a battery, a solar photovoltaic system, or a generator, transformer, or converter windings, to the outlet(s).
Premises Wiring (System
The process of supplying an enclosure with a protective gas with or without continuous flow, at sufficient pressure to prevent the entrance of combustible dust or ignitible fibers/ flyings.
Pressurized [as applied to Hazardous (Classified) Locations]
A seal between electrical systems and flammable or combustible process fluids where a failure could allow the migration of process fluids into the premises’ wiring system.
Process Seal
The process of (1) purging, supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the concentration of any flammable gas or vapor initially present to an acceptable level; and (2) pressurization, supplying an enclosure with a protective gas with or without continuous flow at sufficient pressure to prevent the entrance of a flammable gas or vapor, a combustible dust, or an ignitible fiber.
Purged and Pressurized
One who has qualifications, skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved.
Qualified Person.
An enclosed channel of metallic or nonmetallic materials designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this Code.
Raceway
Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions.
Rainproof
Constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions.
Raintight
A contact device installed at the outlet for the connection of an attachment plug, or for the direct connection of electrical utilization equipment designed to mate with the corresponding contact device. A single receptacle is a single contact device with no other contact device on the same yoke. A multiple receptacle is two or more contact devices on the same yoke.
Receptacle
An outlet where one or more receptacles are installed.
Receptacle Outlet
Any electric circuit that controls any other circuit through a relay or an equivalent device.
Remote-Control Circuit.
A general term for a complete subassembly
Retrofit Kit.
Service conductors made up in the form of a cable.
Service Cable.
The conductors from the service point to the service disconnecting means.
Service Conductors
The overhead conductors between the service point and the first point
Service Conductors, Overhead
The underground conductors between the service point and the first point of connection to the service-entrance conductors in a terminal box, meter, or other enclosure, inside or outside the building wall.
Service Conductors, Underground
The overhead conductors between the utility electric supply system and the service point
Service Drop.
The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop or overhead service conductors.
Service-Entrance Conductors, Overhead System.
The service conductors between the terminals of the service equipment and the point of connection to the service lateral or underground service conductors.
Service-Entrance Conductors, Underground System
The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories, connected to the load end of service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply.
Service Equipment.
The underground conductors between the utility electric supply system and the service point.
Service Lateral
The point of connection between the facilities of the serving utility and the premises wiring.
Service Point
Enclosed fusible switch or circuit breaker installed ahead of the service equipment, nearest the service point (usually, immediately after the metering equipment), intended to provide short circuit fault protection for service-entrance conductors of parts and devices for field equipment.
Service Protective Device
Equipment enclosed in a case or cabinet that is provided with a means of sealing or locking so that live parts cannot be made accessible without opening the enclosure. The equipment may or may not be operable without opening the enclosure.
Sealable Equipment
An electrical source, other than a service, having no direct connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections.
Separately Derived System.
The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served.
Service
The prospective symmetrical fault current at a nominal voltage to which an apparatus or system is able to be connected without sustaining damage exceeding defined acceptance criteria.
Short-Circuit Current Rating
Any window used or designed to be used for the display of goods or advertising material, whether it is fully or partly enclosed or entirely open at the rear and whether or not it has a platform raised higher than the street floor level.
Show Window
Any electric circuit that energizes signaling equipment.
Signaling Circuit.
An electrical component or combination of components of simple construction with well-defined electrical parameters that does not generate more than 1.5 volts, 100 mA, and 25 mW, or a passive component that does not dissipate more than 1.3 watts and is compatible with the intrinsic safety of the circuit in which it is used.
Simple Apparatus [as applied to Hazardous (Classified) Locations].
A system that supplies power independently of an electrical production and distribution network.
Stand-Alone System.
That which is built or constructed, other than equipment.
Structure.
A protective device for limiting surge voltages by discharging or bypassing surge current; it also prevents continued flow of follow current while remaining capable of repeating these functions.
Surge Arrester.
A protective device for limiting transient voltages by diverting or limiting surge current; it also prevents continued flow of follow current while remaining capable of repeating these functions and is designated as follows:
Surge-Protective Device (SPD).
A manually operated device used in conjunction with a transfer switch to provide a means of directly connecting load conductors to a power source and of disconnecting the transfer switch.
Switch, Bypass Isolation
A switch intended for use in general distribution and branch circuits. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage.
Switch, General-Use
A form of general-use switch constructed so that it can be installed in device boxes or on box covers, or otherwise used in conjunction with wiring systems recognized by this Code.
Switch, General-Use Snap.
A switch intended for isolating an electric circuit from the source of power. It has no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means.
Switch, Isolating.
A switch rated in horsepower that is capable of interrupting the maximum operating overload current of a motor of the same horsepower rating as the switch at the rated voltage.
Switch, Motor-Circuit.
An automatic or nonautomatic device for transferring one or more load conductor connections from one power source to another.
Switch, Transfer.
A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets.
Switchboard
An assembly completely enclosed on all sides and top with sheet metal (except for ventilating openings and inspection windows) and containing primary power circuit switching, interrupting devices, or both, with buses and connections. The assembly may include control and auxiliary devices. Access to the interior of the enclosure is provided by doors, removable covers, or both.
Switchgear
A protective device for assembly as an integral part of a motor or motor-compressor that, when properly applied, protects the motor against dangerous overheating due to overload and failure to start.
Thermal Protector (as applied to motors).
The words Thermally Protected appearing on the nameplate of a motor or motor-compressor indicate that the motor is provided with a thermal protector.
Thermally Protected (as applied to motors).
Locations determined to be neither Class I, Divi‐ sion 1; Class I, Division 2; Class I, Zone 0; Class I, Zone 1; Class I, Zone 2; Class II, Division 1; Class II, Division 2; Class III, Division 1; Class III, Division 2; Zone 20; Zone 21; Zone 22; nor any combination thereof.
Unclassified Locations [as applied to Hazardous (Classified) Locations]
Not connected to ground or to a conductive body that extends the ground connection.
Ungrounded
A power supply used to provide alternating current power to a load for some period of time in the event of a power failure.
Uninterruptible Power Supply.
Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes
Utilization Equipment.
Provided with a means to permit circulation of air sufficient to remove an excess of heat, fumes, or vapors
Ventilated
A flammable liquid having a flash point below 38°C, or a flammable liquid whose temperature is above its flash point, or a Class II combustible liquid that has a vapor pressure not exceeding 276 kPa at 38°C and whose temperature is above its flash point.
Volatile Flammable Liquid.
The greatest root-mean-square (rms) (effective) difference of potential between any two conductors of the circuit concerned.
Voltage (of a circuit).
A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g., 230, 230/115, 460, 460Y/265, 400Y/230, 216Y/125). The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment.
Voltage, Nominal.
For grounded circuits, the voltage between the given conductor and that point or conductor of the circuit that is grounded; for ungrounded circuits, the greatest voltage between the given conductor and any other conductor of the circuit.
Voltage to Ground.
Constructed so that moisture will not enter the enclosure under specified test conditions.
Watertight
Constructed or protected so that exposure to the weather will not interfere with successful operation.
Weatherproof
Voltage Ratings for Electric Power Systems and Equipment (60 Hz)
ANSI C84.1-1995
