BU2: Electrical and Mechanical Systems (AUSAT)

Admittance

Reciprocal of IMPEDANCE

Air Blast Transformer

Transformer COOLED BY FORCE CIRCULATION of air through cores and coils

Air Circuit Breaker

A CIRCUIT BREAKER where interruption occurs in AIR.

Air Switch

A SWITCH where interruption occurs in AIR.

Alternating Current

A PERIODIC CURRENT.

Alternator (Synchronous Generator)

A SYNCHRONOUS ALTERNATING-CURRENT machine that changes MECHANICAL power to ELECTRICAL

Ammeter

Instrument for measuring ELECTRIC CURRENT

Ampacity

Current in AMPERES that a conductor can carry on continuous use without EXCEEDING TEMPERATURE rating.

Ampere

CHARGE OF FLOW of one coulomb per second

Appliance

CURRENT CONSUMING equipment.

Appliance Branch Circuit

A BRANCH CIRCUIT that supplies energy to ONE OR MORE outlets.

Armored Cable

Cable provided with a WRAPPING OF METAL for the purpose of mechanical protection.

Askarel

Synthethic non flammable insulating liquid used in transformers as INSULATORS

Automatic Transfer Equipment

Device used to TRANSFER LOAD from one power source to another.

Autotransformer

Transformer where output VOLTAGE ADJUSTS AUTOMATICALLY depending on the required voltage of the equipment.

Auxillary

Device that AIDS the main device or equipment.

Auxillary Gutter

Sheet METAL ENCLOSURE for conductors and wires (Channel)

Ballast

Device that provides the necessary circuit condition for STARTING AND OPERATING A LAMP.

Branch Circuit

Circuit conductor between the final overcrrent device PROTECTING THE CIRCUIT AND OUTLETS.

Branch Conductor

Conductor that BRANCHES OFF at an angle from a continuous run of conductor

Buna

RUBBER INSULATION used on wires, cables and other electrical appliances

Bus

Group of conductors that serve as a COMMON CONNECTION for THREE OR MORE CIRCUITS in a switchgear assembly.

Busbar

A metallic bar used to provide COMMON CONTACT/ TERMINATION for a GROUP OF WIRES

Cable Sheath

The protective COVERING applied over a cable which is non-metallic

Circuit Breaker

An automatic device for STOPPING the flow of current in an electric circuit as a safety measure.

Circuit Homerun

The electrical cable that CARRIES POWER from the main circuit breaker panel to the first electrical box, plug, or switch in the circuit.

Circular Mil

Unit for measuring the cross- sectional AREA of a conductor.

Conductance

Measure of PERMISSIVENESS TO CHARGE FLOW; reciprocal of RESISTANCE.

Conductor

One that PERMITS THE FLOW OF CHARGE when EMF is applied.

Bare Conductor

Conductor having NO COVERING.

Covered Conductor

Conductor encased within a material NOT RECOGNIZED BY CODE as insulation

Insulated Conductor

Conductor encased within a material RECOGNIZED BY CODE as insulation.

Conductivity

Ability to conduct electric current.

Conduit

Structure containing ONE OR MORE DUCTS. (Piping or channel)

Conduit Fittings

ACCESSORIES used to complete a conduit system

Convenience Outlet

Outlet that RECEIVES the plug with flexible cord of electrical appliances

Copper-clad aluminum conductor

Conductors drawn from a COPPER_CLAD ALUMINUM ROD with the copper bonded to an ALUMINUM CORE.

Coulomb

An electric charge of 6.28 x 10^18 electrons

Current

RATE of CHARGE FLOW

Cutout Box

Enclosure that is SURFACE MOUNTED that has SWINGING DOORS that are secured directly to the wall

Demand Factor

Ratio of the MAXIMUM DEMAND of a system to the total connected load of a system.

Device

It is intended to CARRY but NOT UTILIZE electrical energy

Direct Current

UNIDIRECTIONAL CURRENT with a constant value

Disconnecting Means

Disconnecting Means

Device by which conductors CAN BE DISCONNECTED from their source of supply.

Electric Motor

Device for converting ELECTRICAL to MECHANICAL energy

Electrical System

The ENTIRE SYSTEM of conductors, equipment and devices that are interconnected to different sources.

Electrical Units

Volt, Ampere, OHM, watt, watt-hour, coulomb, henry, farad, joule.

Electrical Surge

a TRANSIENT WAVE of current, potential or power in the electric circuit

Electricity

Physical entity associated with the atomic structure of matter that occurs IN POLAR FORMS (positive and negative)

Electromagnetic Induction

Process of EMF GENERATION induced by the movement of magnetic flux

Electromagnetic Force (EMF)

Energy-charge relation that RESULTS IN ELECTRIC PRESSURE which produces charge flow

Electrostatics

Branch of electrical science dealing with the LAWS of electricity at REST.

Emergency Light

A TEMPORARY source of light.

Farad

UNIT OF CAPACITANCE.

Feeder

All circuit conductors between the service equipment and the final branch circuit over-current device; mga feeders in game, reason bakit natatalo ang team.

Flashover

Disruptive ELECTRICAL CHARGE around or over an insulator.

Flexible Conduit

NON-RIGID CONDUIT where conductors may be drawn.

Frequency

NUMBER OF PERIODS occuring in a time of a periodic process.

Fuse

PROTECTIVE DEVICE with fusible element that opens the circuit by MELTING when subjected to excessive current.

Galvanometer

Instrument for measuring comparatively SMALL CURRENTS.

General Purpose Branch Circuit

Branch circuit that supplies a NUMBER OF OUTLETS for lighting and appliances.

Generator

Machine that converts MECHANICAL to ELECTRICAL energy.

AC Generator

Generator that produces Alternating Current.

DC Generator

Generator that produces Direct Current

Ground

The reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the Earth.

Grounded Circuit

A CIRCUIT in which one conductor or point is INTENTIONALLY GROUNDED.

Grounded Conductor

System of CONDUCTORS that is intentionally grounded

Ground Fault Circuit interrupter

Device installed in circuits where leakage can be especially dangerous such as bathrooms, etc.

Grounding Conductor

A conductor wire used to connect a system to a GROUNDING ELECTRODE or electrodes.

Grounding electrode conductor

Conductor used to CONNECT the grounding electrode to the equipment GROUNDING CONDUCTOR.

Henry

Unit of INDUCTANCE

Hysteresis

Magnetic property that results from RESIDUAL MAGNETISM

Impedance

Opposition to AC current by a combination of RESISTANCE and REACTANCE.

Individual Branch Circuit

Branch Circuit that supplies only ONE equipment.

Insulated

Separated from other conducting surface, offering high resistance to the passage of the current.

Insulator

Material or substance that DOES NOT ALLOW the flow of electricity

Interrupting Rating

HIGHEST CURRENT RATING a device is intended to interrupt.

Inverter

Device used to convert DC to AC power.

Isolating Switch

Switch intended for ISOLATING an electric circuit from the source power.

Jumper

A conductor used to MAKE A TEMPORARY CONNECTION between terminals around a break in a circuit.

Junction Box

Box with blank cover which serves the purpose of JOINING DIFFERENT RUNS OF RACEWAY OR CABLE.

Kilowatt-hour

Unit of energy equal to ENERGY TRANSFERRED in an hour. Standard for measuring energy by commercial providers.

Kilowatt hour Meter

Instrument used to MEASURE power consumption.

Knife Switch

Switch where circuit is closed by a MOVING A BLADE engaging contact clips.

Lighting outlet

Outlet used for the direct connection of LIGHTING FIXTURE.

Lightning arrestor

Device providing a path which lightning disturbances are passed through.

Damp Location

PARTIALLY PROTECTED locations under canopies, marquees, roofed open porches and the like.

Dry Location

Location not normally subject to DAMPNESS OR WETNESS. :^)

Wet Location

Installations UNDERGROUND or in concrete slabs subject to water saturation.

Maximum Demand

LARGEST of all the DEMANDS which have occurred during the period of time

Metal-Clad

Components are enclosed in a METAL casing or enclosure.

Meter Center

Place where all meters in a building may be located

Moisture Resistant

A device treated that EXPOSURE TO MOISTURE will not cause injuries.

Mho

Unit of CONDUCTANCE; reciprocal of ohm.

Ohm

Unit of RESISTANCE

Ohmmeter

Instrument for measuring resistance.

Ohm's Law

Law stating that current is DIRECTLY PROPORTIONAL to the applied voltage and INVERSELY PROPORTIONAL to resistance.

Outlet

Point from which current is TAKEN for supply.

Overcurrent.

Any current in EXCESS.