Building Electrical Materials and Equipment

Question 1

 industrial facility that houses the prime mover, electric generator and auxiliaries for conversion of mechanical energy, chemical energy and/or nuclear energy into electrical energy

Answer 1

Power Station

Question 2

 facility or system for the generation of electric power

Answer 2

Power Station

Question 3

 carry power from the transformer through a metering device to the building’s service disconnects
 may be overhead or underground

Answer 3

Service Entrance Conductors

Question 4

 overhead wires extend from a pole-mounted distribution transformer to the building’s service entrance
 Overhead service entrance conductors extending from pole-mounted transformers

Answer 4

Service drop

Question 5

 underground (buried) service entrance conductors.

Answer 5

Service Lateral

Question 6

 includes the components that connect the utility-supplied wiring (the service lateral or service drop) to the service disconnect, excluding the utility’s metering equipment

Answer 6

Service Entrance

Question 7

 receives the service entrance conductors
 The service equipment includes a method of measuring power (metering equipment), a method of cutting off power (main disconnect or switch gear), and overcurrent protection devices (circuit breakers or fuses) that protect the service entrance conductors.

Answer 7

Service Entrance Equipment

Question 8

 required part of the service entrance equipment that allows electrical service from the utility company to be switched off so that power is disconnected to the building installation
 set of fuses or a circuit breaker that protects the service entrance conductors

Answer 8

Service Disconnect

Question 9

 large cabinet or assembly of metal cabinets in which is connected disconnecting switches, overcorrect protection devices (fuses or circuit breakers), other protective devices, and instruments designed to divide large amounts of electrical current into smaller amounts of current used by electrical equipment

Answer 9

Switchboard

Question 10

 one or more metal cabinets that serve as a single unit, including buses, automatic overcurrent protection devices (fuses or circuit breakers)
 equipped with or without switches for the control of light, heat, and power circuits

Answer 10

Panelboard

Question 11

 used in transmitting and distributing power from the power plant to a substation

Answer 11

Transformers

Question 12

 The operation of a large commercial installation depends on power distribution that, in turn, depends on transformers used to change voltage, current, and phase of electrical power nearby and within a building.

Answer 12

Transformers

Question 13

kVA

Answer 13

 Building transformers are rated in

Question 14

: steps down the voltage applied to it are
: typically used in buildings to reduce building system voltages to useable levels

Answer 14

 step-down transformer

Question 15

steps up the voltage applied to it

Answer 15

 step-up transformer

Question 16

 safeguard the building service or an individual circuit from excessive current flows

Answer 16

Overcurrent protection (OCP) devices

Question 17

 protects the circuit components from severe overheating when current flowing through the circuit reaches an amperage that will cause an excessive or dangerous temperature rise in conductors

Answer 17

Overcurrent protection (OCP) devices

Question 18

 serve as automatic overcurrent protection devices
 designed to open a circuit if the amount of current, in amps, that flows through the circuit exceeds the OCP device rating

Answer 18

Fuses and circuit breakers

Question 19

 device designed to open (or trip) and close a circuit by non-automatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating

Answer 19

Circuit Breaker

Question 20

 overcurrent protective device with a circuit opening fusible part that is heated and severed by the passage of overcurrent through it.

Answer 20

Fuse

Question 21

 enclosed in insulating tube

Answer 21

Cartridge Fuse

Question 22

 enclosed in porcelain or rubber commonly used in various electrical appliances

Answer 22

Plug Fuse

Question 23

 opened wire of low melting point commonly used in the safety power switch

Answer 23

Fuse Wire

Question 24

 holds five times its rating for ¼ to 2 seconds (not ideal to loads which requires more than 2 seconds to accelerate)

Answer 24

Non-time delay fuse

Question 25

 holds five times the rating for 10 seconds

Answer 25

Dual-element time delay fuse

Question 26

PEC

Answer 26

Philippine Electrical Code

Question 26

 highest current it can carry continuously without exceeding a specific temperature limit (e.g., without overheating)

Answer 26

Overcurrent Rating

Question 27

 the current that a fuse is able to interrupt without being destroyed or causing an electric arc with unacceptable duration

Answer 27

Interrupting Capacity

Question 28

 broad category of electrical or electronic machine or instrument designed to perform a specific mechanical, chemical, heating, or lighting function through the use of electrical energy

Answer 28

Utilization equipment

Question 29

 an end-use piece of utilization equipment designed to perform a specific function such as cooking, cleaning, cooling, or heating

Answer 29

Electric Appliance

Question 30

 component in an electrical system that is designed to carry but not use electricity  includes components such as switches, receptacles, and relays

Answer 30

Electrical Device

Question 31

 location in a branch circuit where electricity is used  For example, a lighting outlet is the location in a branch circuit where conductors provide power to a light fixture.

Answer 31

Outlet

Question 32

 female connecting device with slotted contacts  installed at an outlet or on equipment, where it is intended to easily establish an electrical connection with an inserted plug

Answer 32

Receptacle

Question 33

 male connecting device that has two or more prongs that are inserted into a receptacle to connect to an electrical circuit

Answer 33

Plug

Question 34

an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another

Answer 34

Switch

Question 35

 used to control a single or group of lamps from one location  has only two terminals

Answer 35

SPST (single pole single throw) switch

Question 36

 used to control a single lamp from two different locations  has three terminals

Answer 36

SPDT (single pole double throw) or three way switch

Question 37

 used to control a single lamp from three or more different locations  has four terminals

Answer 37

Four-way switch

Question 38

 mechanical switching device used to isolate a circuit or an equipment from the supply side  could either be fused or non-fuse type

Answer 38

Disconnect (Safety Power Switch)

Question 39

 any material that conducts electrical current  either solid or stranded

Answer 39

Electrical Conductor

Question 40

are a single solid length of conductor called a wire.

Answer 40

Solid conductors

Question 41

consist of smaller wire strands.

Answer 41

Stranded conductors

Question 42

 an electrical conductor (usually copper or aluminum) that serves as a common connection for two or more electrical circuits  typically solid bars used for power distribution  commonly found in panelboards, switchboards, and other power distribution equipment  either flat strips or hollow tubes

Answer 42

Bus bar

Question 43

 contains more than one conductor bundled together in a factory assembly of wires  an outer sheathing encases and protects the conductors, simplifying installation of multiple wiring

Answer 43

Cable

Question 44

 conductor encased within material of composition or thickness recognized by the PEC as electrical insulation

Answer 44

Insulated Conductor

Question 45

 conductor encased within material of composition or thickness that is not recognized by the PEC as electrical insulation

Answer 45

Covered Conductor

Question 46

 conductor having no covering or electrical insulation whatsoever

Answer 46

Bare Conductor

Question 47

 a stranded conductor or a group of conductors insulated from one another

Answer 47

Cable

Question 48

 enclosed channel for holding wires, cables or busbars

Answer 48

Raceway

Question 49

 Single insulated conductor of solid or stranded bare annealed high conductivity copper, with thermoplastic lead-free insulation of PVC (Polyvinyl Chloride) and protected by a nylon jacket  normally designed to operate up to 600 V

Answer 49

Thermoplastic Cables

Question 50

 the maximum current it can carry continuously without exceeding the temperature limitations of the insulation and sheathing material

Answer 50

Conductor’s Ampacity

Question 51

 electrical boxes and cabinets made of metal (e.g., steel, galvanized steel, aluminum, and so on) or nonmetallic (plastic) materials that provide protection for conductors, connections, controls, and other electrical equipment

Answer 51

Enclosures

Question 52

 metal and non-metallic (plastic) enclosures that hold devices such as switches or outlets and safely permit wiring connections  Boxes are available in four primary shapes: square, rectangular, octagonal, or round.

Answer 52

Electrical boxes

Question 53

 special type of electrical box used to enclose conductor connections  Connections are commonly called junctions in the trade.

Answer 53

Junction boxes (J-boxes)

Question 54

 type of junction box that allows access to a raceway for snaking conductors through the raceway  Knockouts in most boxes and other enclosures can be easily removed to allow wiring to enter the box

Answer 54

Pull box

Question 55

 enclosed channel such as a conduit, tube, or gutter designed for holding wires, cables, or busbars

Answer 55

Raceway

Question 56

 of a standardized, factory-assembled enclosure consists of outer duct-like housing, bus bars, and insulators

Answer 56

Busway

Question 57

 metal sheet or nonmetallic, flame-resistant plastic troughs that serve as a housing that encloses and protects conductors

Answer 57

Wire gutters or wireways

Question 58

* In homes, electric motors are found in refrigerators, freezers, dishwashers, kitchen sink waste disposal, portable kitchen appliances, exhaust and ventilation fans, clothes washers and dryers, furnaces, air conditioners, and paddle fans.

Answer 58

ELECTRIC MOTORS