Building Utilities Flashcards
arki3a
An instrument for measuring the rate of flow of electricity; usually expressed in amperes
Ammeter
The current carrying capacity of a wire or cable; expressed in amperes
Amperage
On a theatre stage; a master switch that distinguishes all stage lights simultaneously.
Blackout Switch
The portion of an electric wiring that extends beyond the final over current device protecting the circuit
Feeder Line
An underground structure used in pulling or splicing electric cables which are laid underground.
Cable Vault
The luminous intensity of a light source; expressed in candelas.
Candlepower
Flow of electricity in a circuit; the unit of measurement is the ampere.
Current
In an electric circuit; a current that flows in one direction only
Direct Current
In electric wiring a metal plate; water pipe; or other type of conductor buried in the earth in manner ensuring a good conductive path to the ground.
Grounding Wire
A unit of illumination equal to 1 lumen per square foot.
Footcandle
A movement or flow of electrically charged particles; typically measured in amperes.
Electric current
What is a utilization equipment which is generally industrial built in?
appliances
a generator of alternating current
alternator
device used to measure rate of flow of electricity
ammeter
device for storing electric energy
capacitor
What is a surface; material; device; or object that scatters light or sound from a source?
diffuser
device used to transform AC to DC
rectifier
device that indicates light intensity in Footcandle
illumeter –
What is a flexible armored conduit used to encase electrical wiring?
greenfield
controls the flow of current to the distribution elements
regulator
cap that receives the service drop
entrance cap
box used for maintaining light control devices
utility box
What is an electromagnetic force flowing between the positive and negative terminals?
flux
electromotive force
voltage
number of AC that flow in a conductor
phase
rate or measure of power used or consumed
watt –
What is an electric device having a resistance which can be adjusted?
rheostat
controls the flow of current to the distribution elements
regulator
instrument used to measure the resistance of a conductor
ohmmeter
materials that resist the flow of electric current
insulator
What is the unit for quantity of electricity?
coulomb
unit of resistance
ohm
unit of electromotive force
volts
unit of candlepower
candela
Standard length of an electrical metal conduit.
10 ft.
PABX or PBX means.
Pvt. Automatic Branch Exchange
Farad is the unit capacity of a ___.
Capacitor
Another name for distribution panel.
Power Panel
Standard size of wire for a circuit line.
No. 12
Standard size of wire for a switch line.
No. 14
A device for converting alternating current to direct current.
Rectifier
Another name for a Rectifier.
D.C. Generator
Interrelationship between value of voltage and current with the same frequency.
Phase
Minimum wire size in square millimeter for a branch circuit with a 30 ampere rating using Type THW strandedcopper conductor in a raceway.
5.5 sqmm
Standard frequency of power supplied by the local power utility company like Meralco.
60 Cycles
The overhead service conductors from the last pole or other aerial support to and including splices; if any; connecting to the service entrance conductors at the building.
Service Drop
The simplest type of building automation system.
Telecommunication System
Resistance in alternating current system.
Impedance
The reciprocal of conductance.
Resistance
A rigid metal housing for a group of heavy conductors insulated from each other and the enclosure; also called Busduct.
Busway
A heavy conductor; usually in the form of a solid copper bar; used for collecting; carrying; and distributing large electric currents; also called a busbar.
Bus
An approved assembly of insulated conductors with fitting and conductor terminations in completely enclosed ventilated protective metal housing where the assembly is designed to carry fault current and to withstand the magnetic forces of such current.
Busway
A box with a blank cover which serves the purpose of joining one different runs of raceways or cables and provided with sufficient space for connection and branching of the enclosed conductors.
Pull Box
This shows the vertical relationships of all panels; feeders; switches; switchboards; and major components are shown up to; but not including; branch circuiting; it is an electrical version of a vertical section taken through the building.
Riser Diagram
In a lightning protection system; the combination of a metal rod and its brace or footing; on the upper part of a structure.
Air Terminal
TW in electrical wire specification means.
Moisture resistant; in wet and dry location
XHHN in wire specification means.
Moisture and Heat Resistant- Cross-Linked Thermosetting
Mho as used in electrical systems calculation is defined as _______.
the reciprocal of ohm
A unit of mechanical power is horsepower. What is electrical power?
Watt
Who said these prophetic words: “Let the future tell the truth and evaluate each one according to his work and accomplishment. The present is theirs; the future for which I really worked for is mine.?
Nikola Tesla
A type of raceway specially constructed for the purpose of pulling in or the withdrawing of wires or cables after the conduit is in place.
Rigid metal conduit (RMC)
The trade name for an insulated conductor with type letter THHN is ______.
Heat resistant thermoplastic
What is / are the advantage/s of a circuit breaker over a fuse? a. It can act as a switch b. Its position can be easily detected (close/open) c. It can be used again after fault has been corrected d. All of these
All of these
What switch combination may be used in order to control a lamp or group of lamps in three different locations?
2-s3w and 1-s4w
It characterizes short circuit
Low resistance; high current
A unit or assembly units or sections and associated fittings forming a rigid structural system used to support cables.
Cable tray
Fusible material in a fuse may be made of any of the following except___.
Silver
It affects the resistance of a conductor. a. Length b. Area c. Temperature
All of the above
It is also known as electric panel or load center.
Panelboard
A cylindrical conduit or conductor; the wall thickness is sufficient to receive a standard pipe.
Conduit
A factory assembly of one or more conductors; each individually insulated and enclosed in a metallic sheath of interlocking metal tape; or a smooth corrugated metallic tube.
metal clad cable (type MC)
It is analogous to pressure in water flow.
Current
Alternating current is characterized as having _____. a. Positive and negative polarity b. Average value is zero c. Has frequency d. All of these
All of these
A circuit type where components are electrically connected end to end.
Series circuit
The over-all covering of underground feeder and branch circuit cables shall be ____.
a. Fungus resistant b. Corrosion resistant
The basic elements of an electric circuit are the following except
Switch
A factory assembly of two or more insulated conductors having an outer sheath of moisture-resistant; flame retardant; non metallic material.
Non metallic sheathed cable (type NM and NMC)
Cables are conductors that are ____. a. Larger than wires b. Stranded (no.6 AWG and larger)
Both a and b
Which of the following metallic materials is considered as the best conductor of electricity?
Gold
Example/s of conductors-on-insulator wiring is are ______. a. Concealed knob and tube b. Open wiring on insulators
Both a and b
A type of surface flush raceway designed to receive conductors and receptacles assembled in the field or in the factory.
Multi-outlet assembly
A type of switch used for transferring one or more load conductor connections from one power source to another.
Transfer switch
The part of the cut out that is design to open or break an electrical current under an excessive load
CIRCUIT BREAKER
Unit of power
WATTS
The unit used in the measure of the rate of flow of electricity
AMPERE
This is where an electric service conductor can be installed
TOWER OR FLATFORM
A type of electric switch consisting of one or more movable copper blades which are hinged and which make contact with stationary forked contract jaws being forced between them
KNIFE SWITCH
Provision for building with an expected electric load demand of 200KVA
TRANSFORMER VAULT
The conversion of alternating current (AC) to direct current (DC)
RECTIFIER
A kind of flourescent lamp that does not use starter element
RAPID START FLOURESCENT LAMP
An iron box or casing by which electrical conduit branches are formed
JUNCTION BOX
A passenger elevator with a constant 24 hour service for residential condominum
5 STOREYS
Minimum service drop of connection line above the ground and from the ground
3.00 m
Minimum distance of poles and transformer support located from the road right of way
500 mm
A vertical flow of air used to separate different function of spaces
AIR CURTAIN
Original name of P-Trap
GOOSENECK
The main feed line of an electrical circuit to which branch circuits are connected
DISTRIBUTION LINE
The minimum width of door in hospital housing unit
1.20m
Another type of circuit breaker element other than bolt-on
PLUG IN TYPE
The most practical conductor of electricity
COPPER WIRE
A channel system in carrying electrical wire
RACEWAY
An electric conductor consisting of a group of smaller diameter conductor strands twisted together
CABLE WIRE
Another name for power panel
DISTRIBUTION PANEL
A device used to convert voltage from higher to lower or vise versa
TRANSFORMER
Metal containing no iron such as copper; brass and aluminum
NON FERROUS METAL
The minimum allowance clearance from the highest point of the roof to the service drop conductor from NBC
2.50m
To bring down voltage
STEP DOWN TRANSFORMER
Wiring not concealed by the building sructure
OPEN WIRING
Transferring the power load from the building circuitry to standby generator or during brownout
AUTOMATIC TRANSFER SWITCH
One with contacts that separate in air
AIR SWITCH
The voltage across the welding arc
ARC VOLTAGE
Cable provided in wrapping of metal usually steel wires or tapes; primarily for the purpose of mechanical protection
ARMORED CABLE
A synthetic non-flammable insulating liquid which; when decomposed by an elctric arc evolves only non-explosive gases
ASKAREL
Is combination of all or a portion of component parts included in an electric apparatus; mounted on a supporting frame or panel and properly interwined
ASSEMBLY
Minimum load over a given period of time
BASE LOAD
That portion of a wiring system extending beyond the final overcurrent device protecting the current
BRANCH CIRCUIT
Is a conductor; or group of conductors; in switchgear assemblies which serves as a common connection for two or more circuit
BUS
Approved assembly of insulated conductors with fitting and conductor terminations in a completely enclosed; ventilated protective metal housing where the system is design to carry fault current and to withstand the magnetic forces of the current
BUSWAY
System of conductor forming an essentially continuous conducting network over the object protected and including any conductors necessary for interconnections of the object protected and an adequate ground
CAGE
A device design to open under abnormal conditions a current carrying circuit without injury itself
CIRCUIT BREAKER
A wire or combination of wires not insulated from one another suitable for carrying electric current
CONDUCTOR
A device or group of devices which serves to govern in some predetermined manner; the electric power delivered to the apparatus to which it is connected
CONTROLLER
A luminous discharge due to ionization of the air surrounding a conductor caused by voltage gradient exceeding a certain critical value
CORONA
A metal housing that houses the circuit breaker or fuses; surface mounted
CUT OUT BOX
Is the ratio of the maximum demand of the system or part of the system to the total connected load of the system
DEMAND FACTOR
A unit of electrical system which is intended to carry but not utilize electrical energy
DEVICE
A single enclosed runway for conductor cables
DUCT
Machine which transforms electric power into mechanical power
ELECTRIC MOTOR
The circuit conductors between the service equipment or the generator switchboard of an isolated plant and the branch circuit overcurrent device
FEEDERS
Unit of illumination when the foot is taken as the unit of length. It is the illumination on a surface one square foot in area in which there is uniformly distributed flux of one lumen
FOOTCANDLE
An overcurrent protective device with a circuit opening fusible member which is heated and severed by the passage of the overcurrent through it
FUSE
Types of lighting that deals with lighting relatively large area covered
GENERAL LIGHTING
Density of the luminous flux on a surface
ILLUMINATION
Is a form of air switch in which the moving element is a hinge blade wedge between stationary contact blades when closed
KNIFE SWITCH
Artificial source of light
LAMP
Device for mechanical support of light
LAMPHOLDER
A radiant energy
LIGHT
Protective device for limitting surge voltage on equipment by discharging or by-passing surge current
LIGHTNING ARRESTER
Is a transient electric disturbance in an electric circuit caused by lightning
LIGHTNING SURGE
Is the radial branch connection to a main line
LINE TAP
Is the ratio of the average load over a designated period of time to the peak load occuring in that period
LOAD FACTOR
Unit of luminous flux
LUMEN
A unit of illumination equal to one lumen per square meter
LUX
Point of the wiring system at which current is taken to supply utilization equipment
OUTLET
A metal box at an outlet which encloses one or more receptacle
OUTLET BOX
Maximum load consumed by a unit in a stated period of time
PEAK LOAD
Device or equipment which is supended from overhead either by means of the flexible cord
PENDENT
Auxillary conductor used in connection with remote measuring devices for operating apparatus at a distant point
PILOT WIRE
Box with a blank cover which is inserted in one or more runs of raceway to facilitate pulling in the conductors and the distributing of the conductors
PULLBOX
Any channel for holding wires; cables or busbars
RACEWAY
Convinience Outlet; Contact device installed at an oulet for the connection of an attachment plug
RECEPTACLE
A raceway especially constructed for the purpose of physical protection of conductors; the pulling in or the conduit is in place and made of metal pipe of standard width and thicknesswithdrawing of wires or cables after the
RIGID METAL CONDUIT
Enclosure of porcelain or other insulating material fitted with terminals and intended for connecting the flexible cord carrying a pendent to permanent wiring
ROSETTE
The overhead service conductor from the last pole or other aerial support to and including splices if any connecting to the service entrance conductors at the building
SERVICE DROP
The raceway that encloses the service entrance conductors
SERVICE RACEWAY
Cable designed for service under water
SUBMARINE CABLE
Is a transient variation in the current potential or power
SURGE
Minimum wire size of THW stranded copper conductor in raceway for a branch circuit in a 30 ampere rating
5.5 mm2
This connetions is used where the load is comparatively small and the length of the secondary circuit is short
SINGLE PHASE TO SUPPLY 120 V LIGHTING LOAD
This connections is used in most urban distribution circuits
SINGLE PHASE TO SUPPLY 120/240 3-WIRE LIGHTING AND POWER LOAD
The 120/240 volt winding is connected in series serving 240 volts on a two wire system; this connection is used for small industrial applications
SINGLE PHASE FOR POWER
Consist merely of two single phase transformers operated 90deg out of phase; the common wire must carry /2 times the load current
TWO PHASE CONNECTIONS
This is used to supply a single phase lighting load and three phase power load simultaneously
DELTA-DELTA FOR POWER AND LIGHTING
This connection is used when single phase lighting load is large as compared with the power load
OPEN DELTA FOR LIGHTING AND POWER
Often it is desirable to increase the voltage of a circuit form a 2400 to 4160 volts to increase its potential capacity
Y DELTA FOR POWER
This connection is similar to the delta-delta bank with only the primary connection changed The primary neutral should not be grounded or tied into the system neutral; since a single phase ground fault may result in extensive blowing of fuses throughout the system This connection requires special watt-hour metering
Y DELTA FOR LIGHTING AND POWER
When operating Y delta and one service is disabled; service maybe maintained at reduced load
OPEN Y DELTA
The single phase lighting load is all on one phase resulting in unblanced primary currents in any one bank
DELTA Y FOR LIGHTING AND POWER
The primary voltage was increased from 2400 to 4160 volts to increase the potential capacity of the system
Y-Y FOR LIGHTING AND POWER
When the ratio of transformation from the primary to secondary voltage is small; the most economical way of stepping down the voltage
Y-Y AUTO TRANSFORMER
In some localities two phase power is required from three phase system
SCOTT CONNECTION 3PHASE TO 2PHASE
If it should be necessary to supply three phase power from a two phase system; the special tap must be provided on the secondary side
SCOTT CONNECTED 2PHASE TO 3PHASE
Thermoplastic
T
Moisture Temperature Resistant
TW
Underground Feeder
UF
Flourinated Ethylene Propylene Moisture Resistant
FEPW
Heat Resitant Rubber
RH
Heat and Moisture Resistant Rubber
RHW
Heat Resistant Latex Rubber
RUH
Moisture and Heat Resistant Thermoplastic
THW
Heat and Moisture Resistant Thermoplstic with Nylon
THWN
Moisture and Heat Resistant Cross Link Polymer
XHHW
Armored Cable
BX
THERMOPLASTIC HEAT RESISTANT
THHN
POLYETHELENE
PE
SILICON ASBESTOS
SA
ASBESTOS AND VARNISH CAMBRIC
AVA
Use low melting point solders or metal the expand when exposed to heat to detect fire
FIXED TEMPERATURE
135deg-197deg F
HEAT DETECTOR
Use of the scattering of light by smoke into view of photo cell through incandescent or diode
PHOTO ELECTRIC DETECTOR
It responds to the high-frequency radiant energy from flames. Alarm is only triggered when IR energy flickers at rate which is chracteristics of flame
INFRARED FLAME DETECTOR
Uses the interruption of small current flow between electrodes by smoke in ionized sampling
IONIZATION SMOKE HEAT
chamber to detect fire
DETECTOR
Fabricated assembly of insulated conductors enclosed in flexible metal sheath. It is used both on exposed and concealed work
ARMOR CABLE (AC)
A factory assemble cable of one or more conductors each individualy insulated and enclosed in a mettalic sheath of interlocking tape of smooth or corrugated tube. This type of cable is especially used for service feeders; branch circuit and for indoor; outdoor work
METAL CLAD CABLE (MC)
Is a factory assembly of one or more conductors insulated with highly compressed refractory mineral insulation enclosed in a liquid and gas tight continous copper sheath. This type of cable is used in dry; wet or continously moist location as service feeders or branch circuit
MINERAL INSULATED CABLE (MI)
Is a also a factory assembly of two or more insulated conductors having a moisture resistant; flame retardant and non metallic material outer sheath. This type is used specifically for one or two family dwellings not exceeding 3 storey building
NON METALLIC SHEATED CABLE (NM)
This type of cable is factory assembly of two or more insulated conductors in an extruded core of moisture resistant and flame retardant material covered within an overlapping spiral metal tape. This type is used in hazardous locations and in cable trays or in raceways
SHIELDED NON METALLIC SHEATED CABLE (SNM)
Is a moisture resistant cable used for underground connections including direct burial in the ground as feeder or branch circuit This is factory assembled two or more insulated conductors with or without associated bare or covered or grounding under a mettalic sheath; This is used for installation of cable trays; raceways; or it is supported by messenger wire
UNDERGROUND FEEDER AND BRANCH CIRCUIT (UF) POWER AND CONTROL TRAY CABLE (TC)
Is an assembly of parallel conductors formed integrally with insulating material web designed especially for field installation in metal surface or raceways
FLAT CABLE ASSEMBLY (FC)
Consist of three or more flat copper conductor placed edge to edge separated and enclosed with an insulating assembly. This type of cable is used for general purposes such as: appliance branch circuit; and for individual branch circuits; especially in hard smooth continous floor surfaces and the like
FLAT CONDUCTOR CABLE (FCC)
Is a single or multi conductor solid dielectric insulated cable rated at 2;000 volts or higher. This type is used for power system up to 35;000 volts
MEDIUM VOLTAGE CABLE (MV)
Part of the facility which accept the house cable riser and house the terminal block at each floor and at the highest or end of a feeder riser cable
TELEPHONE TERMINAL CABINET
Is the simplest type of building automation system; which intercoms; PABX; microwave links; analog and digital telephone system; video conferencing; satellite links; structured cabling and similar devices
TELECOMMUNICATION SYSTEM
Two lights in a long hallway connected in parallel are to be controlled simultaneously at three points
SINGLE POLE SWITCH AT START; 3-WAY SWITCH AT MIDPOINT AND SINGLE POINT SWITCH AT END
Factory assembled of two or more insulated conductors w/ or w/o associated bare cover ground conductor under a non metallic sheath approved forr installation in cable trays; in raceways or in supported by a messenger wire
POWER AND CONTROL TRAY CABLE TYPE
Heat Resistant Rubber / 75 degrees
RH
Light source used in lighting fixtures best specified in areas such as those requiring high illumination levels for detailed work such as needle work
METAL HALIDE
A transformer location required in some localities; where a three phase power is required from a two phase system
SCOTT CONNECTION 2 PHASE TO 3 PHASE
Moisture Resistant Thermoplastic / 60 degrees
TW
Type of switch where pilot light inside a lit to guide the person inside
ILLUMINATED SWITCH
Ampacity of an insulated copper conductor; based on ambient temperature of 30degrees w/a 22 sq.m cross sectional area in size for USE
85 amperes
Main power supply and wiring system for 110/220 volt line; which wiring diagram fits (drawing)
DRAWINGS
Ampacity of an insulated copper conductor; based on ambient temperature of 30degrees w/a 2.0 sq.m cross sectional area in size for TW
15 amperes
Best suited for Rigid Nonmetallic Conduit like PVC for underground installation in buildings
PVC IS ALLOWED FOR AS LONG AS BOTH BURIAL DEPTH OF NO LESS 460mm AND CONCRETE ENCASEMENT IS PROVIDED
Required minimum vertical clearance of an overhead service drop measured from the ground over residential and comercial properties and driveways not subjected to truck traffic and over 600 volts to ground
5.500 mm
Approved assembly of insulated conductors with fitting and conductor terminations in a completely enclosed; ventilated protective metal housing where the system is design to carry fault current and to withstand the magnetic forces of such current
BUSWAYS
A raceway especially constructed for the purpose of physical protection of conductors; the pulling in or the withdrawing of wires or cables after the conduit is in place and made of metal pipe of standard width and thickness
RIGID STEEL CONDUIT
System of voltage used for computing branch circuits and feeder load
120/240 VOLTS
Natural energy source derived from force of wind acting on oblique blades that radiates froma shaft attached to a dynamo to produce electricity
WINDMILL
A point in th electrical system where the electrical load of a given area is assumed to concentrate
PANEL BOARD
Alternating current generated by the alternator where its wave rises to the peak; sinks to zero; drops to the negative peak and rises again to zero a number of times each second depending on the frequency for which the machine is designed
SINGLE PHASE ALTERNATING CURRENT
Alternating current where the alternator comprises of windings mounted at right angles to each other and provided with separate external connections current waves will be produced and each of which will be at its maximum when the other is zero
TWO PHASE ALTERNATING CURRENT
Minimum conductor size for for overhead service drop for copper wire or cable
2.2; 30; 8; 14
Underground Feeder; 60-75 degrees C
UF
Moisture and Heat Resistant Thermoplastic used for dry and wet locations
THW
Vertical vent pipes take in front of the last fixture and connects to its soil stack which acts as a vent
CIRCUIT VENT
A device designed to open and close a circuit by non automatic means and to open the circuit automatically on predetermined over current without damaged to itself when properly applied within its rating
CIRCUIT BREAKER
The raceway that encloses the service entrance conductors
SERVICE RACEWAY
A transformer connection which is ideal in the event of change of primary voltage from 2400 volts to 4160 volts to increase the potential capacity of the system
Y-Y FOR LIGHTING AND POWER
Maximum allowed ampere rating of one chord or plug utilization equipment connected in a 30 ampere branch circuit for lighting or utilization equipment
24 AMPERE
Minimum wire size in sq.mm type THW stranded copper conductor in raceway for a branch circuit with 30 ampere rating
5.5 sq.mm
Minimum vertical clearance of an overhead service drop measured from the ground; at the electrical service entrance or above areas or sidewalks accesible only to pedestrian lanes; measure from final grade line or other accesible surface only for service drop cabled together with a grounded bare messenger wire and limited to 300 volts to ground
3500mm
Minimum ampacity of feeder conductor with a load of more than two wire branch circuit supplied by a 3-wire feeder but not exceed the computed branch circuit load
30 amperes
Minimum wire size in sq.mm type TW copper conductor in raceway for a branch circuit with 20 ampere rating
3.5 sq.m
Ampacity of an insulated copper conductor; based on ambient temperature of 30degrees w/a 8 sq.m cross sectional area in size for THW
45 Amperes
A branch circuit consisting of two or more grounded conductors having a potential difference between them; and a grounded conductor having equal potential difference between it
MULTI WIRE BRANCH CIRCUIT
A type of water coolant operates at a pressure of about 150 atmospheres
PRESSURIZED WATER REACTOR
A unit of electrical system which is intended to carry but not utilize electrical energy
DEVICE
Approved assembly of insulated conductors with fitting and conductor terminations in a completely enclosed; ventilated protective metal housing where the system is design to carry fault current and to withstand the magnetic forces of such current
BUSWAYS
Standard frequency of water supply by the company like Meralco
60 CYCLES
Underground Service Entrance / 75degrees
USE
The overhead service conductor from the last pole or other aerial support to and including the splices; if any connecting to te service entrance conductors at the building
SERVICE DROP
A type of nuclear reactor where the water coolant is permitted to boil within the core by operating at somewhat low pressure
BOILING WATER REACTOR
In a 240V; a three phase 3-wire service; branch cicuits are loaded and distributed to each of the three phase with this objective to attain
BALANCE LOADING
Unit or assembly of unit sections and associated fittings forming a rigid structural system used to support cables
CABLE TRAYS
A transformer connection where the secondary load is a combination of lighting and power. This connection is used when the single phase lighting is large as compared with the power load
OPEN DELTA FOR LIGHTING AND POWER
A useful transformer connection applied when single phase lighting load is all on one phase resulting into unbalanced primary
DELTA Y FOR LIGHTING AND POWER
Type of flexible cable which is a fabricated assembly of insulated conductors which permit its use at exposed weather or excessive moisture
ARMOR CABLE TYPE ACL
A type of alternating current where the alternator comprises the three armature windings set at 120 degrees to each other; current will be produced in the form of triple wave
THREE PHASE ALTERNATING CURRENT
Minimum branch circuit rating for household ranges and cooking appliance
30 amperes
Type of sound absorbent best for lower band frequencies
POROUS ABSORBENT
Unit of frequency which is equal to one cycle per second
HERTZ
A type of alternating current generated by alternator; where its wave rises to its peak; sinks to zero; drop to a negative peak and rises again to zero a number of times each seconds depending on the frequency of the machine is designed
SINGLE PHASE ALTERNATING CURRENT
Use to accept the P-trap assembly of the lavatory
2 WYE AND 2 x 1/8 BEND COMBINATION
A parameter in sizing horizontal branch pipe
NUMBER OF BRANCH VENTS
Two lights in a long hallway connected in parallel are to be controlled simultaneously at
SINGLE POLE SWITCH AT START;
three points
3-WAY SWITCH AT MIDPOINT AND
Main power supply and wiring system for 110/220 volt line; which wiring diagram fits (drawing)
DRAWINGS
A CLEARANCE OF NOT LESS THAN 76mm SHALL BE MAINTAINED BETWEEN CONDUCTORS AND NOT LESS THAN 26mm
Pre requisite in use of split knob and tube wiring
A branch circuit consisting of two or more grounded conductors having a potential difference between them; and a grounded conductor having equal potential difference between it
MULTI WIRE BRANCH CIRCUIT
What is the maximum horizontal range between two or more air terminal for lightning arrest for an effective disaster prevention in building
6000mm to 7600mm
Required minimum vertical clearance of an overhead service drop measured from the ground over residential and comercial properties and driveways not subjected to truck traffic and over 600 volts to ground
5500 mm
Minimum vertical clearance of an overhead service drop measured from the ground; at the electrical service entrance or above areas or sidewalks accesible only to pedestrian lanes; measure from final grade line or other accesible surface only for service drop cabled together with a grounded bare messenger wire and limited to 300 volts to ground
3500mm
Maximum allowed ampere rating of one chord or plug utilization equipment connected in a 30 ampere branch circuit for lighting or utilization equipment
24 amperes
Minimum ampacity of feeder conductor with a load of more than two wire branch circuit supplied by a 3-wire feeder but not exceed the computed branch circuit load
30 amperes
Ampacity of an insulated copper conductor; based on ambient temperature of 30degrees w/a 22 sq.m cross sectional area in size for USE
85 amperes
Ampacity of an insulated copper conductor; based on ambient temperature of 30 degreesw/a 8.0 sq.m cross sectional area in size for THW
45 amperes
Ampacity of an insulated copper conductor; based on ambient temperature of 30degrees w/a 2.0 sq.m cross sectional area in size for TW
15 amperes
Minimum wire size in sq.mm type THW stranded copper conductor in raceway for a branch circuit with 30 ampere rating
5.5 sq.mm
Minimum wire size in sq.mm type TW copper conductor in raceway for a branch circuit with20 ampere rating
3.5 sq.m
Minimum branch circuit rating for household ranges and cooking appliance
30 amperes
A device that is basically a double throw switch of generally 3-pole connection that will automatically transfer the power from the standby generator to the building circuitry during electrical power failure.
Automatic Transfer Switch (ATS)
TW in electrical wire specification means.
Moisture resistant; in wet anddry location
A type of lighting that provides illumination to special objects like sculptures; flower arrangements; etc.
Specific Lighting
XHHN in wire specification means.
Moisture and Heat Resistant- Cross-Linked Thermosetting
Standard length of an electrical metal conduit.
10’
The other type of flame detector other than the ultraviolet type.
Infra Red
PABX or PBX means.
Pvt. Automatic Branch Exchange
Farad is the unit capacity of a ___.
Capacitor
Another name for distribution panel.
Power Panel
Standard size of wire for a circuit line.
No. 12
Standard size of wire for a switch line.
No. 14
Interrelationship between value of voltage and current with the same frequency.
Phase
Descriptive of any material such as synthetic resin which hardens when heated or cured; and does not soften when reheated.
Thermosetting
Minimum wire size in square millimeter for a branch circuit with a 30 ampere rating using
5.5 sqmm
Type THW stranded copper conductor in a raceway.
5.5 sqmm
Standard frequency of power supplied by the local power utility company like Meralco.
60 Cycles
The overhead service conductors from the last pole or other aerial support to and including splices; if any; connecting to the service entrance conductors at the building.
Service Drop
The simplest type of building automation system.
Telecommunication System
A fire detector installed in a fire alarm system which uses low melting point solders or
Fixed Temperature
metal that expands when exposed to heat to detect a fire.
Heat Detector
A private telephone system that interconnects with public telephone systems.
PABX
Resistance in alternating current system.
Impedance
The reciprocal of conductance.
Resistance
A rigid metal housing for a group of heavy conductors insulated from each other and the enclosure; also called Busduct.
Busway
A heavy conductor; usually in the form of a solid copper bar; used for collecting; carrying; and distributing large electric currents; also called a busbar.
Bus
An approved assembly of insulated conductors with fitting and conductor terminations in completely enclosed ventilated protective metal housing where the assembly is designed to carry fault current and to withstand the magnetic forces of such current.
Busway
A type of perimeter detector which detects object in heat range of body temperature.
Passive Infrared
A type of perimeter detector which detects interruption of light beam.
Light Beam
A type of perimeter detector which detects change in sound wave pattern.
Ultrasonic
A box with a blank cover which serves the purpose of joining one different runs of raceways or cables and provided with sufficient space for connection and branching of the enclosed conductors.
Pull Box
A type of perimeter detector which is subject to false alarm from aircraft radar and from movement outside building through window; wood doors; and the like. It uses radio waves.
Microwave
This type of perimeter detector uses both the Passive infrared and Ultrasonic or
Passive Infrared with
Microwave system.
Ultrasonic (or Microwave)
This type of perimeter detector detects a change in capacitance of the area covered; caused by intrusion.
Proximity / Capacitance
A high intensity discharge lamp in which the light is produced by the radiation from a mixture of a metallic vapor; similar to that of a mercury lamp in construction.
Metal Halide Lamp
A type of lamp popular for lighting commercial interiors; uses argon gas to ease starting; it produces light by means of an electric discharge in mercury vapor.
Mercury Lamp
A type of lamp which produces light by means of the reaction of halogen additive in the bulb reacts with chemically with tungsten.
Tungsten Halogen Lamp
A type of lamp generally used for roadways and sidewalks; uses sodium gas.
High-Pressure-Sodium (HPS)
Building with fire alarm and suppression system.
Intelligent Building
In a lightning protection system; the combination of a metal rod and its brace or footing; on the upper part of a structure.
Air Terminal
