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
