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BUILDING UTILITIES: ELECTRICAL > MIDTERM EXAM (2) > Flashcards

MIDTERM EXAM (2) Flashcards

(56 cards)

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1
Q

3 Ways of illustrating the components of the building electrical Systems

A

Block Diagram
Single Line Diagram
Riser Diagram

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2
Q

A horizontal single line diagrams of the building’s electrical system from the incoming service to the utilization items at the end of the system where the major electrical components are shown as blocks or rectangles

A

Block Diagram

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3
Q

A ways of illustrating the components of the building electrical systems that is when electrical symbols are used in lieu of the blocks or it is also called a one line

A

Single Line Diagram

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4
Q

Is a vertical line diagram of the major electrical components of the buildings electrical system presented showing the spatial relations between components

A

Riser Diagram

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5
Q

Are materials which allow the free flow of electrons through them. They inherently have a low bond resistance to the free electrons they contain

A

Conductors

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6
Q

Material for conductors the is preferrable for all types

A

Copper

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7
Q

Most commonly used material for conductors

A

Copper and Aluminum

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8
Q

3 types of Conductors

A

Wires
Cables
Bus Bars

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9
Q

It is an insulated stranded wire

A

Cord

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10
Q

Are single insulated conductors No. 6 AWG or larger or they may be beyond conductors of any size assembled into a single unit.

A

Cables

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11
Q

are single insulated conductors No. 8 AWG (American Wire Gauge or smaller, for the English System. It is the B 1 & S Gauge or Brown and Sharpe Gauge. The smallest size of wire permitted is No. 14.

A

Wires

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12
Q

are range conductors which are not circular in cross sections and usually found only to supply the main switch boards.

A

Bus Bars

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13
Q

Enumerate the Types of Cables

A

Armored Cable (Type AC)
Metal Clad Cable (Type MC)
Mineral Insulated Cable (Type MI)
Non-Metallic Sheathed Cable (Type NM or NMC)
Shielded Non-Metallic Sheathed Cable (Type SNM)
Underground Feeder and Branch Circuit Cable (Type UF)
Service Entrance Cable (Type SE or USE)
Power and Control Tray Cable (Type TC)
Flat Cable Assemblies (Type FC)
Flat Conductor Cable (Type FCC)
Medium Voltage Cable (MV)

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14
Q

Enumerate the Types of Insulators

A

Moisture-& heat-resistant rubber
Thermoplastic
Moisture-resistant thermoplastic
Moisture-& heat-resistant thermoplastic
Moisture-& heat resistant cross-linked thermosetting polyethelene
Silicone-asbestos
Asbestos and Varnished Cambric

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15
Q

5 Purpose of Conduits

A
  1. To protect the enclosed conductors from mechanical injury and chemical damage.
  2. To protect people from shock hazards by providing a grounded enclosure.
  3. To provide a system ground path.
  4. To protect the surroundings against fire hazard as a result of overheating or short circuiting of the enclosed conductors.
  5. To support the conductors
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16
Q

Are circular raceways used to enclose wires and cables and are of metal or plastic (PVC)

A

Conduits

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17
Q

Enumerate the Types of Steel Conduits

A

Rigid Steel Conduits
Intermediate Metal Conduit
Electric Metal Tubing

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18
Q

A thin-wall steel conduits

A

Electric Metal Tubing (EMT)

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19
Q

A type of steel conduits with a thickness of 0.071 mm

A

Intermediate Metal Conduit

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20
Q

A type of steel conduits with a thickness of 0.117 mm.

A

Rigid Steel Conduits

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21
Q

Standard length of steel conduits

A

3 M or 10 ft

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22
Q

Are channels or wiring accessories so designed for holding wires, cables and busbars that are either made of metal, plastic, or any insulating medium.

A

Raceways

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23
Q

2 types of Raceways

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A

Floor Raceways
Ceiling Raceways

24
Q

Enumerate the 2 Ceiling Raceways

Study These Flashcards
A

Header ducts (wireways)
Distribution ducts (laterals)

24
is a point in the wiring system at which current is taken to supply utilization equipment
Outlets
24
Enumerate the 3 Floor Raceways
underfloor raceways cellular metal floor raceways cellular concrete floor raceways (precast)
25
It refers only to the box in the wiring device¹ in which the utilization equipment (appliance) cord is plugged into
Receptable
26
It includes all devices that are normally installed in wall outlets boxes, including receptacles, switches, dimmers, pilot light, attachment plugs and wall plates.
Wiring Device
27
3 Kinds of Outlet
Convenience Outlet ( Attachment Cap) Lighting Outlet Receptacle Outlet
28
A kind of outlet that is the complete set-up which establishes connection between the conductor of the flexible
Convenience Outlet or Attachment Cap
29
A kind of outlet that intended for direct connection to a lamp holder, lighting fixture, or pendant cord terminating in a lamp holder.
Lighting Outlet
30
A kind of outlet where one or more receptacles are installed.
Receptacle Outlet
31
These are contact devices installed at an outlet for the connection of a single attachment plug. It includes receptacles and their matching cap (plug), wall switches, small dimmers, and outlet box-mounted lamps.
Receptacles
32
These are devices for making, breaking, or changing connections from electrical circuit under the conditions of load for which they are rated.
Switches
33
Types of Switch (According to voltage)
250V 400V 5KV
34
Types of Switch (According to intensity of use)
Normal Duty (ND) Heavy Duty (HD) Light Duty (LD)
35
Types of Switch (According to type of service )
Service Switch Power Switches Wiring Switches General-purpose switches Three-way switches Four-way switches Electrolier or multi-circuit switches Momentary contact switches Dimmer switches
36
It is a resistor for regulating a current by means of variable resistances
Rheostat
37
Types of Switch (According to number of poles and throws)
Rotary switch Push-button switch Toggle or tumbler switch
38
Enumerate the different special switches
Time Controlled Switches Remote Control (RC) Switches Air Switch Magnetic Switch Float Switch Mercury Switch Key Switch Automatic Transfer Switch (ATS)
39
These are covering for switches and wall outlets usually made of metal or of phenolic compound (Bakelite)
Wall Plates or Faceplates
40
Different Wall Plates
one-gang, two-gang and three-gang
41
is a device, usually of handle-operated, movable blade and fixed grip, a conductor that control blocks of contacts and shaped copper clips, are forced together to make or break a circuit.
Contractor
41
It is a small electrically-operated contactor.
Relay
41
It is a protective glass surrounding an electric outlet or light switch
Fuse plate
42
are devices whose sole purpose is to protect Insulation , wiring , switches and other apparatus from overheating or burning , due to overloads , to faults or to short circuits , by automatically cutting off the circuit .
Over-current Circuit Protective Devices
42
It is a device consisting of an alloy link of wire with a low melting temperature which is inserted in the circuit , in such a way , that all current which passes through the circuit , must also pass through this metal .
Fuse
42
Types of Fuses
Plug Fuse Cartridge Fuse Open Link Fuse
43
refers to the cutting - off or disconnection of the current electric supply
Tripping
44
______ refers to the upstream side of a load or device ; or it refers to where the current will come from .The downstream side of the device is called the " _________ "
Line Side | Load Side
45
popularly known as " panel " or " electrical panel "
Panelboards
45
An instrument which responds to the changes in temperature and consists of sensitive elements which expands and contracts according to the degree of heat . The movement may make or break an electric current or may close and open a small port in a compressed air line .
Thermostat
45
A switch that automatically interrupts an electric circuit to prevent excess current from damaging apparatus in the circuit or from causing a fire .
Circuit Breaker
45
it is simply the be disassembled and a new fuse link inserted to replace the one within . box wherein the protective devises are housed from which the circuits and busbars terminate . If the devises are of fuses , it is called a " __________and if the devices are circuit breakers , it is called a " ___________________l .
Panelboards |Fuse Panel| Breaker Panel
46
A. Nonrenewable plug fuse B. Nonrenewable knife blade fuse C. Nonrenewable dual element time delay ferrule cartridge fuses D. Nonrenewable high interrupting capacity current limiting fuse ( dual element ) E. Nonrenewable miniature fuse
46
Types of Panel Boards
Lighting Panelboards ( LP ) Power or Motor Panelboards ( PP ) Distribution Panelboards ( DP )

BUILDING UTILITIES: ELECTRICAL (3 decks)

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