Philippine Electrical Code Flashcards
These are electrical systems of 600 volts or less. These are used within a facility to supply power to lightings, general purpose outlets and utilization equipment.
Utilization system
These are electrical systems of voltages over 600 volts. These are used in large industrial facilities to supply large motors and other related type equipment and apparatus
Distribution Systems
What is the identifier of a grounding conductor as stipulated in the PEC
A white or gray outer finish, or by three continuous white stripes along its entire length.
Banks and Office buildings have the highest minimum lighting load at ___________
39 VA/m^2
Storage spaces like warehouses have the lowest minimum lighting load by occupancy at __________
3 VA/m^2
Barbershops/Parlors, Dwelling Units, Schools and Stores have the second highest minimum lighting load by occupancy at _________
33 VA/m^2
This is the most common lighting load by occupancy. Spaces like clubs, courtrooms, hospitals, hotels, industrial buildings and restaurants are rated to have this minimum lighting load.
22 VA/m^2
Outlets for HEAVY DUTY LAMPHOLDERS shall be calculated at a minimum of _________.
600 VA
Outlets for SIGN AND OUTLINE LIGHTINGS shall be calculated at a minimum of _________ for each required branch circuit.
1200 VA
RECEPTACLE OUTLETS shall be calculated not less than _____________ for each required branch circuit.
180 VA
All 125V and/or 250V, single phase, 15 and 20A receptacles installed is locations such as Bathroom, Garage, Outdoors, Crawl Spaces, Unfinished Basement, Kitchens, Laundry, Utility and Wet bar sink and Boathouses shall have ___________ for personnel.
GFCI
Ground-Fault Circuit-Interrupter
Appliance receptacle outlets installed in a dwelling unit for specific appliances, such as laundry equipment shall be installed within ____________ of the intended location of the appliance.
1800 mm (1.8 m)
Receptacles shall be installed so that no point measured horizontally along the floor line in any wall space is more
than _________ from a receptacle outlet.
1800 mm (1.8 m)
Receptacle outlets shall be located above, but not more than _________ above, the countertop.
500 mm (0.5 m)
For an Overhead Service-Drop Conductors and Underground Service-Lateral Conductors, the conductor shall not be smaller than ____________ copper or ___________ aluminum or copper-clad aluminum.
8.00 mm^2 (3.2 mm dia.), 14 mm^2
Overhead Service-Drop Conductors shall have a vertical clearance of not less than __________ above the roof surface. The vertical clearance above the roof level shall be maintained for a distance of not less than 900 mm in all directions from the edge of the roof.
2400 mm (2.4 m)
The ampacity of the service entrance conductors shall be the sum of the noncontinuous loads plus _________ percent of continuous loads.
125
These are loads that are connected for a long period of time (3 hours or more) such as lighting, computer terminals, copy machines, HVAC equipment and other devices and equipment found in offices.
Continuous Load
Are loads that are energized for duration less than three hours such as the general purpose receptacles (convenience) outlets, residential lighting outlets and so on.
Non-continuous loads
PEC and NEC require that the rating of the over-current device must be AT LEAST ____ of the continuous load.
125%
This is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. This is also described as the current rating or current-carrying capacity, it is the RMS electric current which a device can continuously carry while remaining within its temperature rating.
Ampacity
14 AWG = _____ sq. mm
2.0
12 AWG = _____ sq. mm
3.5
10 AWG = _____ sq. mm
5.5
8 AWG = ___ sq. mm
8.0
1 AWG = ____ sq. mm
38
2 AWG = ____ sq. mm
30.0
0 or 1/0 AWG = ____ sq. mm
50
00 or 2/0 AWG = ____ sq. mm
60
The normal air temperature in an area while there is no current flowing in the wire.
Ambient Temperature.
What conductor has an outer covering of a glass braid?
FEP or FEPB
Fluorinated Ethylene Propylene
What wire is used for machine tool wiring in both wet and dry locations?
MTW
Moisture-, heat-, and oil-resistant thermoplastic
Moisture Resistant Thermoset Conductors for both wet and dry locations.
RHW and RHW-2
What Thermoset Conductor is used for Switchboard Wiring only.
SIS
What Thermoplastic Conductor is used for Switchboard Wiring only.
TBS
Thermoplastic and fibrous outer braid
Which conductors are Nylon-jacketed?
THHN and THWN
Heat Resistant Thermoplastic Conductor with Nylon Jacket
THHN
What is the maximum Operating Temperature of THHN?
90 deg C or 194 deg F
Moisture and Heat Resistant Thermoplastic without outer covering.
THW
Moisture and Heat Resistant Thermoplastic with Nylon Jacket.
THWN
What is the Maximum Operating Temperature of a THWN conductor?
75 deg C or 167 deg F
Moisture Resistant Thermoplastic with Max Operating Temperature of 60 deg C or 140 deg F
TW
These are loads like fluorescent lamps, rectifiers, variable-frequency motor drives, personal computer power supply, etc. They produced harmonics in the current waveform that add up in the neutral rather than cancelling. These harmonic current are high frequency current which causes a stronger skin effect thus bringing more heat to the wire.
Nonlinear loads
An increase in resistance due to high value of frequency of the current flowing. It is characterized by letting the current flow on the surface of the conductor which means that there is a higher resistance at the inner part of the cross-section of the wire. The higher the resistance of the wire, the greater will the heat be.
Skin effect
This is commonly used to enclose, support and protect conductors for both power and control circuits. It can be metallic or non-metallic.
Electrical Conduits
A 10 ft (3000 mm) long smooth-walled, threaded conduit having a circular cross section and heaviest wall thickness of all metal conduit. It can be used in all applications and all environments including direct encasement in concrete, direct burial, or corrosive areas if suitable protected.
Rigid Metal Conduit (RMC)
A 3000 mm long rigid steel conduit having a circular cross-section but has thinner wall compared to RMC. It is galvanized on the outside diameter and has a UL-approved corrosion resistant, organic or inorganic coating on the interior. Although it is thinner it can be as strong (or even stronger) than that of RMC but has a lighter weight to handle.
Intermediate Metal Conduit (IMC)
A galvanized steel or aluminum cylindrical conduit. It is an unthreaded plain-end product joined together by set screw, indentation or compressed connectors and coupling. It is the lightest weight of all tubular conduits.
Electric Metallic Conduit
It consists of helical-wound metal strip formed to produce a circular cross-section. It is commonly used for equipment connections where it is required to minimize transmission of vibration from equipment such as motor to the conduit system
Flexible Metal Conduit
A flexible metal conduit made of interlocked metal strips covered by liquid tight, nonmetallic, sunlight-resistant outer jacket. This is designed to prevent the infiltration of liquids, vapors or solid materials into the conduit.
LIquidtight Flexible Metal Conduit ( LFMC)
A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media.
Askarel
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
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.
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 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).
________ ground-fault circuit interrupters trip when the current to ground has a value in the range of 4 mA to 6 mA.
Class A
The highest current at rated voltage that a device is intended to interrupt under standard test conditions.
Interrupting Rating.
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.
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 load where the wave shape of the steady-state current does not follow the wave shape of the applied voltage.
Nonlinear Load.
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 nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g., 120/240 volts, 480Y/277 volts, 600 volts). The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment
Nominal Voltage
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
Electronically Actuated Fuse
An overcurrent protective device with a circuit-opening
fusible part that is heated and severed by the passage of overcurrent through it.
Fuse
Where to obtain an Electrical Permit for buildings, trailers, mobile homes etc.?
Office of the Local Building Official
Where to obtain Electrical Permits for watercrafts?
Maritime Industry Authority (Marina)
What are the plans to be submitted along with the request for permit?
Location and Site Plans, Legend and Symbols, General Notes and/or Specifications, Electrical Layout (including Plan for Power, Lighting/Receptacle Outlets, and Fire Alarm Circuits), Schedule of Loads, Design Analysis, and One Line Diagram.
The width of the working space in front of the electric equipment shall be the width of the equipment or ______whichever is greater. In all cases, the work space shall permit at least a 90 degree opening of equipment doors or hinged panels.
760 mm
Equipment that is associated with the electrical installation and is located above or below the electrical equipment shall be permitted to extend not more than _______ beyond the front of the electrical equipment.
150 mm (6 in.)
The minimum headroom of working spaces about service equipment, switchboards, panel boards, or motor control centers shall be
a. 2000 mm
Except as elsewhere required or permitted by this Code, live parts of electrical equipment operating at _____volts or more shall be guarded against accidental contact by approved enclosures
50
Sufficient space shall be provided and maintained about electric equipment to permit ready and safe operation and maintenance of such equipment. Where energized parts are exposed, the minimum clear work space shall not be less than _____
2000 mm
The following shall be used only for the grounded circuit
conductor except for
a. conductor with continuous white or gray covering
b. conductor with three continuous white stripes on other than
green insulation
c. marking of white or gray color at the termination
d. yellow color
d. yellow color
What is the MINIMUM feeder load to be used for each 2-wire, small-appliance branch circuit?
180 VA per receptacle
What color must be used to identify an insulated 14 sq mm or smaller grounded conductor?
Gray
According to the Philippine Electrical Code.
a. Any fault on a branch circuit should open the branch
circuit breaker rather than the feeder overcurrent
protection.
b. All faults on a feeder should open the feeder disconnect
rather than the service overcurrent protection.
c. the electrical system is considered to be coordinated if the
design of the relaying scheme is redundant
d. A local fault shall be detected only by local protective
device
a. Any fault on a branch circuit should open the branch
circuit breaker rather than the feeder overcurrent
protection.
Cable trays shall ______.
I. have side rails or equivalent structural members
II. not present sharp edges or burrs
III. have suitable strength and rigidity
I, II, and III
Wireways and Busways shall have a support of not less than _________ mm or _________ mm in case of vertical runs.
4500, 1500
What is the minimum distance of a laundry outlet from the appliances?
1800 mm
Hallway ___________ mm or more must have at least one outlet.
3000
Derating factors do not apply to conductors in nipples having a length not exceeding
600 mm
Gutters shall be supported throughout
their entire length at suitable intervals
preferably not exceeding
1500 mm
In open wiring on insulators, support shall be installed on conductors within _________ mm from a tap or splices.
150 mm
Conductors must have a clearance from windows, porches, fire escapes of not less than;
1,000 mm
Service conductors passing over roof must have a clearance over the roof which they pass of not less than
2,500 mm
The minimum clearance for service drops over buildings.
2,500 mm
The minimum clearance for service drops over side walks.
3,100 mm
The minimum clearance of service drops over driveway, alleys, and public roads.
5,500 mm
Code requires that the minimum area exposed surface offered by a plate electrode shall be;
¼ sq. meter
A single grounding electrode is permitted when the resistance to ground does not exceed;
25 ohms
In order to protect a personal and prevent shock, the equipment should be connected good earth ground through the?
cold water pipe
Communication, radio, and television coaxial cables shall be permitted at a height of not less than ______ above swimming and wading pools, diving structures, and observation stands, towers, or platforms.
3000 mm
A Cable containing 45 conductors has a correction factor of
35 %
Raceways on the outside of buildings shall be ______.
weatherproof and covered
Which of the following is the maximum allowable rating of a permanently connected appliance where the branch overcurrent device is used as the appliance disconnecting means?
1/8 hp
The maximum number of quarter bends in one run of RMC and IMT is ________.
four
There are situations where derivations from the code
requirements are necessary. Before such deviations are
made, there must be a written permission from one of the
following entities. Which one is this?
Code Enforcing Authority
Power levels range from _____are used for induction melting
5 kW to 42,000 kW
This type of fitting is specifically designed to serve as a water drain and air vent while providing positive explosion proof protection.
breather
For a 3-phase, 4-wire delta system with the center of one leg grounded, there are two voltages to ground. For example, on a 240-volt system, two legs would each have 120 volts to ground and the third, or “high” leg, would have ______ volts to ground.
208
Frequencies used for induction melting range from about
50 Hz to 10 kHz
Signs which contain incandescent lamp holders shall be marked to indicate the maximum allowable ____ of lamps .
Wattage
Sign and outline lighting outlets shall be computed at a minimum of ______ volt-amperes for each required branch circuit
1200
The maximum number of outlets permitted on 15- and 20-ampere branch circuits is ______ and ______ outlets, respectively
10 , 13
Where a conduit enters a box, fitting, or other enclosure, a ______shall be provided to protect the wire from abrasion unless the design of the box, fitting, or enclosure is such as to afford equivalent protection.
Bushing
A transformer rated over 600 volts with a secondary rated
over 600 volts, with secondary protection consisting of six
circuit breakers. The sum of the ratings of the circuit
breakers is not permitted to exceed ________ percent of the
rated secondary current.
300
A WYE-DELTA starter for a single voltage three phase SC induction motor would require the connection of a certain number of wires from the motor. How many wires would be needed?
9 wires
According to the PEC Code, the minimum insulation level for neutral conductors of residential installations which have solidly grounded systems shall NOT be less than this voltage? Which is this?
600 volts
Receptacle outlets in floors shall not be counted as part of the required number of receptacle outlets unless located within _____ of the wall.
450 mm
For a one-family dwelling and each unit of a two-family
dwelling that is at grade level, at least one receptacle outlet
accessible at grade level and not more than _____ above
grade shall be installed at the front and back of the dwelling
2000 mm
Power levels range from ______are used for induction heating
5 kW to 42,000 kW
No automatic cutout or switch shall be placed in the equipment _________conductor of a premises wiring system unless the opening of the cutout or switch disconnects all sources of energy.
grounding
The conductor with the highest insulation temperature rating is
RHH
Which of the following receptacle outlet listed below should
calculate at 180 volt-ampere?
I. one (1) receptacle outlet (1 pair of hot slot) in yoke
II. Two (2) receptacle outlet (2 pair of hot slot) in yoke
III. Three (3) receptacle outlet (2 pair of hot slot) in yoke
I, II and III
The lubricant used for sleeve bearings on motors is usually
oil
The correct method of measuring the power taken by an AC electric motor is to use a
wattmeter
An applicant for Registered Master Electrician Examination must be at least completed _____ for five year Bachelor of Science in Electrical Engineering program and has Specific record of _______ practice in electrical wiring and installation.
3 years, 1 year
A high school graduate can take the Registered Master
Electricians Examination if he/she has subsequent specific
record of at least _______ years of apprenticeship in
electrical wiring, installations of electrical equipment.
5
The most valid objection for not fusing the middle wire of a 3-
wire system either a grounded neutral is that
a. It will increase the replacement cost of the fuses
b. Shutdown will be increased due to the blowing of the neutral fuse
c. Blowing of the neutral fuse may unbalance the voltages on the two sides of the system with possible burnouts of some of the lamps
d. The size of the neutral wire must be made twice as large as the ungrounded line wires
c. Blowing of the neutral fuse may unbalance the voltages on the two sides of the system with possible burnouts of some of the lamps
The favorite newspaper lines which reads “was burnt due to faulty electrical wiring” means:
protective device failure during fault
This kind of fuse is so designed to cause the rapid escape of gas when its element blows as a result of high current.
expulsion
This is used as a vertical guide and support for groups of cable from their points of origin to the horizontal plane for easy tracing.
cable ladder
Which of the following contact point metals has the highest melting point?
a. silver
b. tungsten
c. gold
d. Copper
a. silver
Overcurrent in transformers affect all of the following EXCEPT.
breather effectiveness
Fuse in motor circuits provides
a. none of these
b. open-circuit protection
c. overcurrent protection
d. short circuit protection
d. short circuit protection
If a motor overheats, it must be due to
misaligned
Voltage drop in a uniformly loaded distributor fed at one end is calculated by assuming the whole of the load concentrated at
middle point
If a 480 volt motor has a full-load current of 34 amperes, then the standard disconnecting means must be which of the following:
40 amps
What shall be the minimum size of conductor for signage?
2.0 sq mm
At least _____wall switch-controlled lighting outlet shall be installed in every habitable room and bathroom.
one
The allowable fill of electrical conduits.
40%
The normal operating temperatures of cartridge type fuse at its rating;
50 deg. C
Fuses must be clearly marked with which of the following:
a. Voltage rating
b. Ampere rating
c. Interruption rating, if other than 10,000
amperes
d. All of the above
d. All of the above
The ampacity of a conductor must be derated where the ambient temperature exceeds which of the following:
30 degrees C
If a transformer vault is not protected by an automatic sprinkler system, then it must have a minimum fire resistance and structural strength of which of the following periods of time:
3 hours
The neutral conductor in an electrical installation has which of the following qualities:
It carries the unbalanced current.
Open conductors that are not service entrance cables shall NOT BE INSTALLED less than which of the following:
a. 3,100 mm from grade level
b. 2,900 mm below grade level
c. 2,500 mm below grade level
d. 1,300 mm from grade level
a. 3,100 mm from grade level
Lightning protection system ground terminals must be bonded to which of the following:
a. The building or structure
b. The building or structure grounding electrode systems
c. To a common grounding electrode conductor
d. A surge arrestor
b. The building or structure grounding electrode systems
Concealed knob-and-tube wiring is not permitted in which of the following applications:
a. Commercial garages
b. Motion picture studios
c. Hazardous classified locations
d. All of the above
a. Commercial garages
If there are 7 current-carrying conductors in a raceway, then the individual ampacity of each conductor must be reduced by which of the following:
a. 70% because of the number of conductors
b. 30% because all conductors are current-carrying
c. 80% of the continuous load
d. 20% of the continuous load
b. 30% because all conductors are current-carrying
The following wiring method is approved to be
installed inside a duct used for vapor removal and
ventilation of commercial type equipment:
a. EMT
b. Nonmetallic sheathed cable
c. Rigid steel conduit
d. None of the above
a. EMT
The work space for equipment must allow _______ opening of any equipment doors or hinged panels.
a. 90-degree
Terminals connected to a grounded conductor shall be identified in which of the following ways:
a. Identification shall be substantially white in color
b. Connection must use a terminal screw that is not readily removable and is green in color
c. Identification must include an engraved metal tag
d. None of the above
Identification shall be substantially white in color
The receptacle example listed below which may be
connected to a small appliance branch circuit is which of the
following:
a. Garage ceiling receptacle for an automatic garage door opener
b. Any receptacle which is within 3600 mm of the kitchen
c. An electric clock plugged in at the dining room
d. An electric hair dryer
c. An electric clock plugged in at the dining room
The service disconnection means in a building shall not have more than how many switches or circuit breakers:
6
The total number of underground conductors for an outside lighting circuit on a single common neutral conductor is which of the following:
There is no limit specified
When protected solely by enamel, which of the following shall not be installed in outdoor or wet locations:
a. Ferrous raceways
b. Fittings
c. Boxes
d. All of the above
d. All of the above
Which of the following is NOT an acceptable method of
mounting electrical equipment to a masonry wall?
A. With bolts through the wall supported by metal plates on
the back side
B. With lag bolts screwed into lead masonry anchors
C. With molly bolts through holes drilled entirely through the wall
D. With screws driven into wooden plugs in the wall
D. With screws driven into wooden plugs in the wall
The branch circuit breaker device shall protect all \_\_\_\_\_\_\_\_. A. appliances B. conductors and devices C. branch circuit loads D. fittings
C. branch circuit loads
Plug fuses and fuse-holders shall NOT be used between conductors and the grounded neutral in circuits exceeding how many volts ?
125
Electrical continuity at service equipment shall be assured by all
of the following EXCEPT ________.
A. threaded metal couplings made up wrench tight
B. threadless metal couplings for rigid metal conduit using standard
locknuts and bushings
C. threadless metal couplings for electrical metallic tubing using
bonding locknuts and bushings
D. bonding of the service equipment to the grounded service
conductor
A. threaded metal couplings made up wrench tight
Coatings on which of the following shall be removed at threads, contact points, and contact surfaces or be connected by means of fittings so designed as to make such removal unnecessary in bonding other enclosures for grounding?
Enamel
A personnel protection device that de-energizes a circuit
when the current to ground exceeds a predetermined value
less than required to operate the supply circuit overcurrent
protective device is called a ________
circuit breaker
Which of the following colors indicates an equipment grounding conductor in a flexible cord?
Green with a yellow stripe
The effective grounding path to ground from circuits, equipment and metal equipment enclosures shall NOT ________
A. be permanent and continuous
B. have the capacity to conduct safely any fault currents to ground
C. have sufficiently low impedance to limit the voltage to ground
D. use the earth as the sole equipment-grounding conductor
D. use the earth as the sole equipment-grounding conductor
What is the MINIMUM voltage rating for the grounded conductor in a solidly grounded neutral system of 1 kV or more?
Equal to the kV rating of the ungrounded conductors
Copper Clad Aluminum wire is different from Aluminum wire in that it
a. Has more insulation around the wire
b. The copper wire is coated with aluminum
c. Can only be used in livestock operations
d. Is rated the same as pure copper wire
d. Is rated the same as pure copper wire
This kind of fuse is so designed to cause the rapid escape of gas when its element blows as a result of high current.
expulsion
In switchgear application, the term “dead fronts” means that
a. the front and rear panels are hinged
b. an access door is at the end of the structure
c. no equipment is mounted on the front panel
d. energized parts are not exposed on the front
panel
d. energized parts are not exposed on the front
panel
A circuit breaker that can be closed against a fault and operate at once, although the solenoid mechanism may continue through its closing operation, is said to be
trip-free
In ordering standard cartridge fuses it is necessary to specify only
a. the current capacity
b. the voltage of the circuit
c. the current capacity and the voltage of the circuit
d. the power to be dissipated
c. the current capacity and the voltage of the
circuit
The largest size regular plug fuse used is rated at
30 amperes
All wiring shall be so installed that, when completed, the system will be free of ______.
short circuits
One of the two plug-fuses in a 120-volt circuit blows because of a short circuit. If a 120-volt lamp is screwed into the fuse socket while the circuit is still shorted, the lamp will
a. burn dimly
b. remain dark
c. burn out
d. burn normally
d. burn normally
For a feeder supplying household cooking equipment
and electric clothes dryers the maximum unbalanced load on
the neutral conductor shall be considered as ______ of the
load on the ungrounded conductors.
70%
Equipment that is associated with the electrical installation and is located above or below the electrical equipment shall bepermitted to extend not more than ____mm (6 in.) beyond the front of the electrical equipment.
150 mm
Except as elsewhere required or permitted by this Code, live parts of electrical equipment operating at _____volts or more shall be guarded against accidental contact by approved enclosures
50
What is the MINIMUM feeder load to be used for each 2-wire, small-appliance branch circuit?
1,500 VA
What color must be used to identify an insulated 14 sq mm or smaller grounded conductor?
Gray
The maximum electrical trade size of intermediate conduit is
100mm
Before starting any installation work, alteration, repair, or extension on any electrical system, what type of permit is needed?
Electrical permit
Fluorescent light fixtures supported independently of an outlet box shall meet
which of the following requirements:
a. May be connected by a metal raceway
b. May use nonmetallic sheathed romex cable
c. May be connected by a nonmetallic raceway
d. All of the above
d. All of the above
Service entrance equipment includes which of the following:
I. Panelboards
II. Meter enclosures
III. Service disconnecting means
I & III only
Medium voltage cable insulation is rated for which of the following:
2001 volts and higher
Single phase loads connected to the load side of a phase converter shall not be connected in which of the following manners:
a. To the manufactured phase
b. To the grounded phase
c. To the neutral
d. To the high leg
a. To the manufactured phase
According to the Philippine Electric Code, which of the following must be true of wiring installed to meet the minimum Code requirements?
It is safe and free from hazards
The lowest point of the drip loop of a 208/120 volt, 3-phase, 4-wire electrical system shall have a minimum clearance above a pedestrian sidewalk which is no less than?
3100 mm
The grounding electrode conductor connection to a driven ground rod shall be which of the following:
a. Made with wire taps
b. Accessible
c. Direct-buried
d. Not be required to be accessible
d. Not be required to be accessible
Photovoltaic system currents are considered to be which of the following:
a. Inverted currents
b. Continuous currents
c. Limited currents
d. Stand alone systems
b. Continuous currents
Lighting that is required for a hoist pit shall meet which of the following requirements:
a. Connections must be run in flexible metal conduit
b. It will not be connected to the load side of the ground-fault circuit interrupter
c. The switch will not be readily accessible
d. All of the above
b. It will not be connected to the load side of the ground-fault circuit interrupter
Low voltage equipment in a hospital that comes in frequent contact with people’s bodies must be which of the following:
a. Able to operate at an electrical potential of 10 volts or less
b. Approved as intrinsically safe
c. Be moisture resistant
d. All of the above
d. All of the above
A disconnecting means for a controller is also permitted to be the disconnecting means for the motor and driven machine, even where out of sight of the motor and driven machine:
a. in an industrial building with qualified service personnel, if capable of being locked in the open position
b. if capable of being locked in the open position
c. in commercial and industrial buildings with qualified service personnel
d. if provided with an alarm to indicate when the disconnect is closed
a. in an industrial building with qualified service personnel, if capable of being locked in the open position
The conductors connecting to motor controllers and to control devices are required to be:
a. copper, aluminum, or copper-clad aluminum conductors
b. only copper-clad aluminum conductors
c. copper or copper-clad aluminum conductors
d. only copper conductors unless identified for other materials
d. only copper conductors unless identified for other materials
The standard ampere ratings for fuses and inverse time circuit breakers are any of the following except for.
a.35 b. 45 c.125 d.185
d.185
According to PEC restricted access shall be defined as located behind one of the following except for.
a. Removable and sealable covers over the adjusting means
b. Bolted equipment enclosure doors
c. Locked doors accessible only to qualified personnel
d. MV switch gear
d. MV switch gear
The allowable ampacity of 2.0 sq mm THWN copper conductor are rated up to _____________volts.
2000
The isolating switch ________be required where the disconnecting means is mounted on removable truck panels or metal-enclosed switchgear units that cannot be opened unless the circuit is disconnected and that, when removed from the normal operating position, automatically disconnect the circuit breaker
or switch from all energized parts.
a. shall not b. shall c. should not d. should
a. shall not
Service cables, where subject to physical damage, shall be protected by any of the following except for.
a. IMC b. RMC c. EMT d. SMC
d. SMC
The terminal for the connection of the equipment grounding conductor shall be identified by one of the following except for.
a. A green, not readily removable terminal screw with a hexagonal head.
b. A green, hexagonal, not readily removable terminal nut.
c. A green pressure wire connector.
d. A green tag
d. A green tag
Conductors on poles shall have a separation of not less than ________ where not placed on racks or brackets.
300 mm
How would you seal unused convenience outlet in panels and boxes?
metal plugs and plates
Where conductors are adjusted to compensate for voltage drop, equipment grounding conductors, where required, shall be adjusted proportionally according to __________.
cross section area
Line and ground connecting conductors shall not be smaller than 2.0 sq mm copper or 3.5 sq mm aluminum. The arrester grounding conductor shall be connected to one of the following except for.
a. Grounded service conductor
b. Grounding electrode conductor of 25 ohms or higher
c. Grounding electrode for the service
d. Equipment grounding terminal in the service equipment
b. Grounding electrode conductor of 25 ohms or higher
The minimum number of branch circuits shall be determined from the ________.
a. total computed and the size of disconnect needed
b. total computed load and the size or rating of the circuits used
c. size or rating of the circuits used
d. minimum number required by the PEC
b. total computed load and the size or rating of the circuits used
The carrying capacity of aluminum wire when compared to a similar size of copper wire, which has the same kind of insulation, is
84%
The code permits the use of only one circuit for small single-family dwelling unit having a floor area of not more than _______ m2
with load not exceeding ________ volt-amperes
50, 3680
Thirty (30) amperes is one of the five special branch circuits rating with a circuit conductor of
5.5 mm2
In house wiring, grounded conductors must not be
a. fused
b. insulated
c. placed in conduit
d. mechanically protected
a. fused
In open wire installation, the wires are supported on
a. post insulators
b. tubes
c. strain insulators
d. knobs
d. knobs
Arcing tips are used on air circuit breakers to
a. increase the contact
b. protect the main contacts
c. decrease the arcing time
d. limit the short circuit current
b. protect the main contacts
A breaker is said to be trip free if
a. the closing and tripping operations are independent
b. it will trip on any value of reverse current
c. the tripping devices operate easily
d. it is not latched in position when closed
a. the closing and tripping operations are independent
A reliable conductor used to ensure the required conductivity between metal parts which are to be electrically connected is called which of the following:
Insulated conductor
The current measured in amperes which a conductor can carry continuously under standard conditions without exceeding the conductor’s maximum temperature rating is called:
Maximum current
Limiting the total quantity of circuits in any given enclosure does which of the following:
a. Minimizes the effects of a short circuit in one circuit
b. Eliminates over-expansion in the future
c. Provides easy access to qualified workers
d. Provides a standard for the Authority Having Jurisdiction
a. Minimizes the effects of a short circuit in one circuit
Items in the Code that identify actions that are specifically required or prohibited are considered which of the following:
a. Permissive rules
b. Mandatory rules
c. Guidelines for examination of installation
d. Permitted use
b. Mandatory rule
Two or more ungrounded conductors with equal voltage running between them and a grounded conductor is considered which of the following:
a. Control circuit
b. Feeder
c. Branch circuit
d. Loop feed
c. Branch circuit
A device that de-energizes a circuit or a portion of a circuit within an established time frame when a current to ground exceeds the values determined for a Class A device is which of the following:
a. Circuit breaker
b. Fuse
c. Ground-fault interrupter
d. Voltage regulator switch
c. Ground-fault interrupter
A device that protects a motor against overheating and is an integral part of that motor is considered which of the following:
a. Integral fuse
b. Ground-fault protector
c. Thermal protector
d. Shunt trip switch
c. Thermal protector
An assembly of two or more single-pole fuses is which of the following:
a. Multiple fuse
b. Multi-tap connector
c. Switching device
d. Panel-board
a. Multiple fuse
A continuous load is one in which one of the following types of current is expected to run non-stop for three hours or more:
a. Continuous
b. Normal
c. Maximum
d. Limited
c. Maximum
A branch circuit where two or more ungrounded conductors, with a potential difference between them, and a grounded conductor with equal potential difference between it and each ungrounded conductor is referred to as which of the following:
a. Continuous loop feed system
b. Multi-wire
c. General purpose circuit
d. Regulated branch circuit
b. Multi-wire
The purpose of the Philippine Electrical Code is to provide which of the following:
a. A standard by which professionals may design installations
b. Efficient electrical installations
c. Cost-effective installations
d. Safe electrical installations
d. Safe electrical installation
Circuit voltage is best defined as which of the following:
a. Average potential between two conductors
b. Maximum potential difference between two conductors
c. Effective difference of potential between two conductors
d. Total amperes produced between two conductors
c. Effective difference of potential between two conductors
The connection device installed at an outlet to allow for two or more contact devices at the same yoke is which of the following:
a. Duplex outlet
b. Multiple receptacle
c. Slice connector
d. None of the above
b. Multiple receptacle
A large single panel assembly of panels containing mounted switches, overcurrent and protection devices and buses is considered which of the following:
a. Panelboard
b. Switchboard
c. Automatic transfer switch
d. Service panel
b. Switchboard
A switching device utilized to isolate a circuit or equipment from an established power source is determined to be which of the following:
a. Interrupter switch
b. Circuit breaker
c. Cutout
d. Disconnection Switch
d. Disconnection Switch
A compartment to which one or more air ducts are connected to form part of an air distribution system is called which of the following:
a. Plenum chamber
b. Ventilation duct
c. Air-flow box
d. Circulation cavity
a. Plenum chamber
Which of the following installations are covered by the Electrical Code:
a. Power wiring for a large industrial machine
b. Computer wiring in an office building
c. Telephone cable in a flexible duct
d. All the above
d. All the above
The clear work space on one side of equipment with exposed live parts, which operates at 600 volts nominal or less to ground, and which will require examination, adjustment or maintenance shall be at least which of the following:
a. 600 mm wide
b. 1000 mm wide
c. 760 mm wide
d. 2 times the width of the panel
c. 760 mm wide
The floor of a vault for electrical equipment with either a vacant space or additional floors below it shall have a minimum fire resistance of
3 hours
Circuits with 100 amperes or less, or with 2.0 sq mm to 50 sq mm conductors, can only be used for conductors rated
60 degrees C (140 degrees F)
Voltage to ground of 0-150, with exposed live parts on one side of the work space and no live or grounded parts on the other side, must have a minimum clear distance of?
1000 mm
High-voltage conductor tunnel installations require metal conduit or metal raceways and which of the following:
a. Type MC cable
b. Aluminum conductors
c. Copper-clad aluminum conductors
d. EMT cable
a. Type MC cable
Unused raceway or cable openings in boxes and conduits must be closed so that the protection provided is which of the following:
a. At least equal to the protection provided by the wall of the box or conduit
b. Equal to the depth of the wall framing
c. Greater than the protection provided by the box or conduit alone
d. Adequate to act as a fire stop
a. At least equal to the protection provided by the wall of the box or conduit
The fire rating for walls, floors and doors containing equipment over 600 volts nominal shall be a minimum of?
3 hours
Often, equipment and terminations are labeled with which of the following:
a. The initials of the installer
b. Service tag
c. Tightening torque
d. Wiring designations
c. Tightening torque
Ventilation system electrical controls shall be installed in manner in which the airflow can be managed in which of the following ways:
a. Vented to the outside
b. Reversed
c. Limited upon demand
d. Prevented
b. Reversed
In order to be electrically secure prior to soldering, splices must be which of the following:
a. Sanded
b. Joined mechanically
c. Free of rough edges
d. Coated with flux
b. Joined mechanically
Unless otherwise specified, live parts for electrical equipment operating at ____ volts or more shall be guarded.
a. 50 b. 100 c. 150 d. 200
a. 50
Voltage to ground of 150-600 with exposed live parts on both sides of the working space must have a clear distance not less than?
2000 mm
Concrete and brick walls are considered which of the following:
a. Dry locations
b. Insulators
c. Wet locations
d. Grounded
d. Grounded
If a conductor material is not specified in a particular Article or Section, the material shall be assumed to be
Copper
A high-leg conductor in a three-phase, 4-wire delta secondary shall be what color?
Orange
Conductor sizes are listed in which of the following:
a. Circular mils
b. Diameter or thickness
c. AWG or millimeters
d. AWG or circular mils
d. AWG or circular mils
A single-family dwelling has three bathrooms each with the following: a lighting fixture, a fan, and one receptacle outlet. In one of the bathrooms, the lighting fixture, fan, and receptacle outlet are installed on a dedicated 20 ampere circuit. For this dwelling, the minimum number of 20 ampere circuits required to serve the bathrooms is which of the following:
a. Two b. Three c. Four d. Five
a. Two
In a single-phase, 3-wire electrical system, the middle conductor must be?
Grounded
In a 3-wire, single phase electrical system, the nominal voltage must be 120 volts between the ungrounded conductor and the neutral, and the volts between the two ungrounded conductors must be:
240 volts
In a single-phase, 3-wire electrical system, the hot conductors are referred to as?
Ungrounded conductors
The current flowing through the neutral of a 120/240 volt 3-wire, single-phase electrical system is calculated as which of the following?
a. The difference between the current of the two ungrounded conductors
b. The sum of the current flowing on the two ungrounded conductors
c. The current of the first ungrounded conductor divided by the current of the second ungrounded conductor
d. 240 volts divided by 120 volts
a. The difference between the current of the two ungrounded conductors
The exposed non-current carrying metal parts of a hand-held cord-and-plug drill must be grounded in which of the following scenarios:
a. The power source is greater than 150 volts to ground
b. The drill is for residential use
c. The drill is being used in a hazardous location
d. All of the above
d. All of the above
If a rod electrode is required for grounding purposes and a layer of rock restricts the rod from being driven into the ground, which of the following alternate methods of installation shall be used:
a. Connect to the nearest steel section of the building
b. Connect to the metal water main
c. Bury the rod in a trench which is a minimum of 1500 mm deep
d. Bury the rod in steel conduit with a minimum of 150 mm of cover
c. Bury the rod in a trench which is a minimum of 1500 mm deep
As compared with solid wires, stranded wires of the same cross sectional area have the following advantages EXCEPT one. Which one is this?
a. It is larger in overall diameter
b. It is easier to skin off the insulation
c. It is better for high voltage
d. It has a higher current rating
d. It has a higher current rating
According to the PEC Code, the minimum insulation level for neutral conductors of residential installations which have solidly grounded systems shall NOT be less than this voltage?
Which is this?
600 volts
The grounding electrode for grounding communications system may be connected to the nearest accessible location on any of the following EXCEPT one. Which one is this?
a. Buried interior PVC water piping system
b. Grounding electrode conductor
c. Building structure
d. Counterpoise of the tower
c. Building structure
Transformers are rated in
kVA
A _____ is a certain type cartridge fuse that can be readily replaced.
renewable fuse
Openings around electrical penetrations through fire-resistant rated walls, partitions, floors or ceilings shall be ______.
fire stopped
In the computation of the size of building wire, the PEC requires that at least a certain percent increase must be added. What percent is this?
25%
The maximum total voltage drop on both feeders and branch circuits to the farthest outlet should not exceed ____ percent of the supply voltage.
5
The total load on any overcurrent device located in a panelboard shall not exceed ____ percent of its rating where in normal operation the load will continue for 3 hours or more.
80
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 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
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
A general term including material, fittings, devices, appliances, luminaires (fixtures), apparatus, and the like used as a part of, or in connection with, an electrical installation.
Equipment
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.
Installations under ground 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
Wet Location
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
Dry Location
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 flammable liquid having a flash point below _______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
38°C
An assembly of a fuse support with either a fuseholder, fuse carrier, or disconnecting blade. The fuseholder or fuse carrier may include a conducting element (fuse link) or may act as the
disconnecting blade by the inclusion of a nonfusible member.
Cutout
Receptacle outlets in floors shall not be counted as part of the required number of receptacle outlets unless located within _____ of the wall
450 mm
At least _______ wall switch–controlled lighting outlet or wall switch–controlled receptacle shall be installed in guest rooms in hotels, motels, or similar occupancies
One
When the total connected load is operated simultaneously, the demand factor is______
100
Where computations result in a fraction of an ampere that is less than ______, such fractions shall be permitted to be dropped.
0.5
Open conductors shall be supported on the following except for.
pendant
Disconnecting means shall be provided on the _______side of all fuses in circuits over 150 volts to ground and cartridge fuses in circuits of any voltage where accessible to other than qualified persons so that each individual circuit containing fuses can be independently disconnected from the source of power.
supply
Where not subject to physical damage, Type MC cables shall be permitted as follows except for :
a. For services, feeders, and branch circuits
b. For power, lighting, control, and signal circuits
c. Indoors or outdoors
d. where exposed to the destructive corrosive conditions
d. where exposed to the destructive corrosive conditions
A factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation and enclosed in a liquid tight and gastight continuous copper or alloy steel
sheath
Mineral-Insulated
The following are permitted as an equipment grounding conductor except for
RNC
EMC shall not be used in the following except for
a. In hoist ways
b. In storage battery rooms
c. In any hazardous (classified) location
d. exposed and concealed locations
d. exposed and concealed locations
EMT shall be permitted to be used for branch circuits as follows except for
a. In dry locations
b. Where concealed
c. For system voltages of 1000 volts maximum
d. In storage battery rooms
d. In storage battery rooms
A grounded metal enclosure containing factory-mounted, bare or insulated conductors, which are usually copper or aluminum bars, rods, or tubes
Bus way
The current-carrying conductors in cable bus shall have an insulation rating of ______ degC or higher
75°C
Neutral bus, where required, shall be sized for the following except for
a. carry neutral load current,
b. carry harmonic currents
c. shall have adequate momentary and short-circuit rating consistent with system requirements.
d. carry the sub synchronous current
d. carry the sub synchronous current
The combined cross-sectional area of all conductors or cables shall not exceed _____ percent of the cross-sectional area of the cell or header.
40
Conductors shall not be installed in cellular metal floor raceways as follows except for
a. Where subject to corrosive vapor
b. In any hazardous (classified) location
c. In commercial garages, other than for supplying ceiling outlets or extensions to the area below the floor but not above
d. enclosures for electric conductors.
d. enclosures for electric conductors
Splices and taps shall be permitted within a wireway provided they are accessible. The conductors, including splices and taps, shall not fill the wireway to more than ____ percent of its area at that point.
75
Flexible cords and cables shall be used only for the following except for
a. Pendants
b. Wiring of luminaires (fixtures)
c. Connection of portable lamps, portable and mobile signs, or appliances
d. As a substitute for the fixed wiring of a structure
d. As a substitute for the fixed wiring of a structure
Flexible cords and cables shall be used only for the following except for
a. Elevator cables
b. Wiring of cranes and hoists
c. Prevention of the transmission of noise or vibration
d. Where run through doorways, windows, or similar openings
d. Where run through doorways, windows, or similar openings
According to PEC, which of the following is not a standard practice?
a. Conductors shall be secured in a manner that does not tend to cut or abrade the insulation.
b. Conductor insulation shall be protected from abrasion where it passes through metal.
c. Splices and taps shall not be located within luminaire (fixture) arms or stems.
d. Splices or taps shall be made within or on a luminaire (fixture)
d. Splices or taps shall be made within or on a luminaire (fixture)
Which of the following is not correct Flexible cord shall be of the hard-service type.
a. Having conductors not smaller than the branch-circuit conductors
b. Having ampacity at least equal to the branch-circuit over current device
c. Having an equipment grounding conductor.
d. Having an enough Tension to carry 24 kg weight
d. Having an enough Tension to carry 24 kg weight
Luminaires (fixtures) that require adjusting or aiming after installation shall not be required to be equipped with a/an __________ provided the exposed cord is of the hard-usage or extra hard-usage type and is not longer than that required for maximum adjustment. The cord shall not be subject to strain or physical damage.
attachment plug or cord connector
A bushing or the equivalent shall be provided where flexible cord enters at ________. The bushing shall be of insulating material unless a jacketed type of cord is used.
a. the base or stem of a portable lamp
b. the conduit
c. the junction box
c. Service cap at the service point
a. the base or stem of a portable lamp
Additional feeders or branch circuits shall be permitted to supply the following except for.
a. Fire pumps
b. Emergency systems
c. Legally required standby systems
d. Motor of the Elevator
d. Motor of the Elevator
Additional feeders or branch circuits shall be permitted where the capacity requirements are in excess of _________ amperes at a supply voltage of _______ volts or less.
2000, 600
The disconnecting means for each supply permitted shall consist of not more than _______ switches or _______ circuit breakers mounted in a single enclosure, in a group of separate enclosures, or in or on a switchboard.
6, 6
The vertical clearances of all service-drop conductors shall be based on conductor temperature of ________, no wind, with final unloaded sag in the wire, conductor, or cable.
15ºC
A grounded conductor shall be permitted to be uninsulated as follows except for.
a. Bare copper used in a raceway
b. Bare copper for direct burial where bare copper is judged to be suitable for the soil conditions
c. Bare copper for direct burial without regard to soil conditions where part of a cable assembly identified for underground use.
d. Aluminum
d. Aluminum
The ampacity of the service-entrance conductors before the application of any adjustment or correction factors shall not be less than.
a. The sum of the noncontinuous loads plus 100 percent of continuous loads
b. The sum of noncontinuous load plus the continuous load if the service-entrance conductors terminate in an overcurrent device where both the overcurrent device and its assembly are listed for operation at 100 percent of their rating
c. 100 percent of the maximimum permissible load
d. 115 of the rating of the disconnect
b. The sum of noncontinuous load plus the continuous load if the service-entrance conductors terminate in an overcurrent device where both the overcurrent device and its assembly are listed for operation at 100 percent of their rating
Service cables, where subject to physical damage, shall be protected by any of the following
except for.
a. Rigid metal conduit
b. Intermediate metal conduit
c. Rigid nonmetallic conduit suitable for the location
d. Split knob and tube
d. Split knob and tube
The allowable ampacity of conductor are rated up to ___volts
2000
The ampacity of 3.5 sq mm THWN copper conductor is 30 A in free air. What will be its allowable ampacity if it will be directly buried.
25
In dwelling units and guest rooms of hotels and motels and similar occupancies, the voltage shall not exceed 230 V, nominal between conductors that supply the terminal of the following.
Which one is not included in the standard?
a. Lighting fixture
b. 1440 VA connected load
c. Load less than ¼ hp
d. 200 W per receptacle
d. 200 W per receptacle
For ranges 8 ¾ kW or more rating, the minimum Branch Circuit shall be.
40
An outlet dedicated only to supply four loads of 250 W, 15 W, 100W and 200 W. What will be the minimum size of conductor in the outlet?
2.0 sq mm.
A 100 % demand factor shall only apply for Electric Clothes dryer up ________ units or less
4
15 dwelling units has a demand factor of
40 %
Overhead conductor for festoon lighting shall not be smaller than
3.5 sq. mm
In Lighting system, A span exceeding ___________m, the conductor shall be supported by________
12, messenger wire
What shall be the minimum creepage distance between open conductor
100 mm
What shall be the minimum separation of conductor on Poles
300 mm
What shall be the minimum climbing space between power and communication conductor @ nominal voltage of 600 V
760 mm
The size of bonding jumper conductor for a system that supplies Class I – III circuit and is derived from the transformer rated not more than 1 kV shall not be smaller than _______ copper and ________ aluminum
2.0 sq mm, 3.5 sq mm
The size of conductor for grounding of instrument transformer shall be
3.5 sq. mm, 5.5 sq mm
Where installed in raceways, conductors of size ______________ and larger shall be stranded.
8.0 sq mm
According to PEC only conductors __________or larger are permitted to be connected in parallel to form a single conductor.
50 sq mm
Which of the following is not an approved corrosion resistant material for conduit?
a. zinc b. cadmium c. enamel d. Nickel
d. Nickel
This particular size of wire can still be operated from 2 kV up to 8 kV
8.0 sq mm
Thermoplastic insulation material may stiffen @ temperature of
-10ºC
Bare conductors shall be securely and rigidly supported so that the minimum clearance between bare current-carrying metal parts of different potential mounted on the same surface will not be less than
50 mm
Splices or taps shall be permitted within gutters where they are accessible by means of removable covers or doors. The conductors, including splices and taps, shall not fill the gutter
to more than______% of its area.
75
Recessed fluorescent luminaires (fixtures) installed in the wall or the ceiling, provided there is a minimum clearance of ________between the luminaire (fixture) and the nearest point of a storage space.
150 mm
Heating cables shall not be installed in the following:
a. In closets
b. Over walls
c. Over partitions that extend to the ceiling, unless they are isolated single runs of embedded cable
d. Heating elements of cables separated at 20 mm
d. Heating elements of cables separated at 20 mm
The meter disconnect is a load-break disconnect switch designed to interrupt the service load on standard voltage services with self-contained meter sockets. The purpose of the meter
disconnect switch is to facilitate _______________except for
a. Meter change
b. maintenance
c. disconnect service
d. extension point
d. extension point
Which of the following element are not permitted to be connected and installed on the supply side of the service disconnecting means.
a. Low-impedance shunt circuits
b. surge arresters
c. surge-protective capacitors
d. instrument transformers (current and voltage)
a. Low-impedance shunt circuits
If a switch and fuse combination is used, the fuses employed shall be capable of interrupting any current _____ than the interrupting capacity of the switch during a time that the groundfault protective system will not cause the switch to open.
higher
Means must be provided for protection of circuits that may be disconnected from the generating station bus. A switch with ________ action used to disconnect the outside circuits
from the station generator and alternatively connect these circuits to ground would satisfy the condition of a single set of arresters protecting more than one circuit.
a. single throw
b. tumbler
c. double throw
d. three way
c. double throw
Device number for Multifunction device
11
Distance Relay Device Number
21
Device NumberSynchronizing or Synchronism-check device
25
Undervoltage Relay device number
27
Undervoltage Relay device number
27
Directional Power Relay device number
32
Field (over/under excitation) Relay device number
40
Instantaneous Current device number
50
AC Inverse Time Overcurrent Relay
51
Overvoltage relay device number
59
Governor device number
65
AC Directional Overcurrent Relay device number
67
Differential Protective Relay device number
87
Line Switch device number
89
Regulating device Device number
90
