SWITCHES Rating and Use of Snap Switches 1. Alternating-Current General Use • Resistive and inductive loads, including electric-discharge lamps. • Tungsten-filament lamp loads not exceeding ____V • Motor loads not exceeding _____% of ampere rating. 2. Alternating-Current/Direct-Current General Use • Resistive loads • Inductive loads not exceeding __% of ampere rating. • Tungsten-filament lamp loads not exceeding ___V 3. CO/ALR Snap Switches - rated __ ampere or less directly connected to aluminum conductors. 4. Dimmer Switches - shall be used only to control permanently installed _____ luminaires.

115 volts. 80 percent 50% 115 volts. 20 incandescent

PEC CHAPTER 4 EQUIPMENT FOR GENERAL USE Flashcards by ROLLIE ESTEVES

FIXTURE WIRES

Minimum Size
The fixture (luminaire) wires shall not be smaller than \_\_\_\_\_\_(mm2)

0.75 mm2 (1.2 mm dia.)

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FIXTURE WIRES

Marking
The thermoplastic insulated fixture (luminaire) wire shall be durably marked on the surface at intervals not exceeding _____(mm). All other fixture shall be marked by means of printed tag attached to the coil and reel

600 mm

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SWITCHES

Location

The grip of the operating handle of the switch or circuit breaker is not more than ________(mm) above the floor or working platform.

1980 mm

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SWITCHES

Mounting of Snap Switches

______- Shall be mounted on insulating materials that separates the conductors at least 13 mm from the surface wired over.

Surface-Type

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SWITCHES

Mounting of Snap Switches

________ - Flush-type snap switches shall be mounted in boxes installed so that extension plaster ears are seated against the surface

Box Mounted

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SWITCHES

Knife Switches

_________ - 1200 amperes at 250 volts or less, and at over 600 amperes at 251V to 600V.

Isolating Switches / To Interrupt Currents

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SWITCHES

Rating and Use of Snap Switches

Alternating-Current General Use
• Resistive and inductive loads, including electric-discharge lamps.
• Tungsten-filament lamp loads not exceeding ____V
• Motor loads not exceeding _____% of ampere rating.
Alternating-Current/Direct-Current General Use
• Resistive loads
• Inductive loads not exceeding __% of ampere rating.
• Tungsten-filament lamp loads not exceeding ___V
CO/ALR Snap Switches - rated __ ampere or less directly connected to aluminum conductors.
Dimmer Switches - shall be used only to control permanently installed _____ luminaires.

115 volts.
80 percent

50%
115 volts.

incandescent

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RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Rating
- Receptacles and cord connectors shall be rated not less than ________V (4) and shall be of a type not suitable for use as lampholders.

15A, 125V, or 15A, 250V,

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RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacles for Aluminum Conductors
- Shall be rated __A or less and designed for direct connection of aluminum conductors and shall be marked with ____.

20A

CO/ALR

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RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Mounting

_______ The mounting yoke or strap is held rigidly at the finished surface.

Boxes That Are Set Back

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RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Mounting

_______- The mounting yoke or strap is held rigidly at the finished surface.

Boxes That Are Flush

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RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Mounting

________ - Held rigidly by one or more screws, or be a device assembly.

Receptacles Mounted on Covers

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RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Mounting

_________ - Flushed and project a minimum of 0.38 mm from metal faceplates

Position of Receptacle Faces

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RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Mounting

___________ - Shall not be installed in a face-up position.

Receptacles in Countertops

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RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Mounting

_________- Enclosed so that live wiring terminals are not exposed to contact.

Exposed Terminals

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RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Faceplates (Cover Plates)

Thickness of Metal Faceplates -
Ferrous Metal ______(mm) ; Nonferrous Metal ______(mm)
Grounding - Metal faceplates shall be _______.
Faceplates of Insulating Material - Shall be noncombustible not less than ______(mm) thick; permitted to be less than 0.25 mm thick if formed or reinforced to provide ______mechanical strength.

(0. 75 mm thick)
(1. 00 mm thick)

grounded

0.25 mm
adequate

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SWITCHBOARDS AND PANELBOARDS

Supports and Arrangement of Busbars and Conductors (3)

Overheating and inductive effects shall be avoided.
Shall be installed with a main bonding if used as service equipment.
Phase arrangement on 3-phase buses shall be A, B, C.

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SWITCHBOARDS AND PANELBOARDS

Switchboards

a) Clearance - The clearance from the ceiling shall not be less than ______(mm) to the top of the switchboard.
b) Location of Switchboards - Switchboards hall be located in permanently ___ locations and then where competent supervision and accessible to only licensed electrical practitioner.

900 mm

dry

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SWITCHBOARDS AND PANELBOARDS

Panelboards

a) Classification of Panelboards (2)

Lighting and Appliance Branch-Circuit Panelboard
- Shall have overcurrent protection of ________A or less.
- Shall have more than __% of its overcurrent devices protect lighting and appliance branch circuits.
Power Panelboard
- Shall have __% or fewer overcurrent devices protect lighting and appliance branch circuits.

30 ampere

10%

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SWITCHBOARDS AND PANELBOARDS

Panel Boards

Number of Overcurrent Devices in One Panelboards

 Shall have not more than __ overcurrent devices of lighting and appliance branch-circuit panelboard.
 2-pole circuit breakers ( __ overcurrent devices in the panel)
 3-pole circuit breakers (__overcurrent devices in the panel)

42 -1 pole
21 - 2 pole
14 - 3 pole

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SWITCHBOARDS AND PANELBOARDS

Panel Boards

Overcurrent Protection
 Lighting and Appliance Branch-Circuit Panelboard Individually Protected - Shall be individually protected on the supply side by not more than ____ circuit breakers or ____ of fuses.

2 main

2 sets

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SWITCHBOARDS AND PANELBOARDS

Panel Boards

 Power Panelboard Protection - Shall be protected of an overcurrent device which is _______ the size of the protection for the panelboard.

not greater than

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SWITCHBOARDS AND PANELBOARDS

Panel Boards

 Snap Switches Rated at 30 Ampere or Less - Shall have an overcurrent protection of ______A or less.

200A

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SWITCHBOARDS AND PANELBOARDS

Panel Boards

 Supplied Through a Transformer - Shall have an overcurrent protection on the _________ of the transformer.

secondary side

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SWITCHBOARDS AND PANELBOARDS Panel Boards  _______- Shall be secured in place by an additional fastener.

Back-Fed Devices

SWITCHBOARDS AND PANELBOARDS Panel Boards  _______ - Shall not be installed in the panelboards.

Delta Breakers

INDUSTRIAL CONTROL PANEL Minimum Size and Ampacity Industrial control panels shall be rated ____% of the full-load current.

125%

LUMINAIRES (LIGHTING FIXTURES), LAMPHOLDERS, AND LAMPS Luminaire (Fixtures) in Specific Locations a) Wet and Damp Locations - Shall be made so that _____ cannot enter. It shall be marked ―Suitable for Wet Locations‖ or ―Suitable for Damp Locations‖. b) Corrosive Locations - Shall be a type ____ for such locations. c) In Ducts or Hoods - The temperature limits in the area shall not be exceeded. Material shall be excluded from _____________(3) and shall be corrosion resistant. d) Bathtub and Shower Areas - No lighting fixtures (cord-suspended luminaries), light tracks, pendants, or ceiling suspended fans within ______(mm) horizontally and _____(mm) vertically from the top of the bathtub rim or shower stall threshold.

water suitable vapors, grease, oil, or cooking vapors, 900 mm 2400 mm

LUMINAIRES (LIGHTING FIXTURES), LAMPHOLDERS, AND LAMPS Luminaires (Fixtures) Near or Over Combustible Materials Luminaires near combustible materials shall not be subject to temperature in excess of ____C. And, shall be located at least _____(mm) above the floor or so guarded that lamps can’t be damaged

90°C 2400 mm

LUMINAIRES (LIGHTING FIXTURES), LAMPHOLDERS, AND LAMPS Luminaires (Fixtures) in Clothes Closets Types Permitted (2)

1. Surface-mounted or Recessed Incandescent Luminaire | 2. Surface-mounted or Recessed Fluorescent Luminaire

LUMINAIRES (LIGHTING FIXTURES), LAMPHOLDERS, AND LAMPS Luminaires (Fixtures) in Clothes Closets Types not Permitted (3)

1. Incandescent Luminaires (Fixtures) with open or partially enclosed lamps. 2. Pendant Luminaires (Fixtures) 3. Lampholders

LUMINAIRES (LIGHTING FIXTURES), LAMPHOLDERS, AND LAMPS Luminaires (Fixtures) in Clothes Closets Clearances Permitted for Different Luminaire Fixture (From the Nearest Storage Space) 1. Surface-mounted incandescent luminaire - _____(mm) 2. Surface-mounted fluorescent luminaire -_____(mm) 3. Recessed incandescent luminaire - _____(mm) 4. Recessed fluorescent luminaire -_____(mm)

300 mm 150 mm 150 mm 150 mm

LUMINAIRES (LIGHTING FIXTURES), LAMPHOLDERS, AND LAMPS Wiring of Luminaires Wirings of luminaires shall have the ______ for screw shells of lamp holders, and circuit terminals.

same polarity

LUMINAIRES (LIGHTING FIXTURES), LAMPHOLDERS, AND LAMPS Wiring of Luminaires Pendant Conductors for Incandescent Filament Lamps a) Size - Pendant conductors shall comply with the ff:  Mogul-base, medium-base screw-hell lampholders - not smaller than ________(mm2)  Intermediate or Candelabra base lampholder - not smaller than ________(mm2) b) Twisted or Cabled - longer than ________(mm) shall be twisted together.

2. 0 mm2 (1.6 mm dia.) 0. 75 mm2 (1.0 mm. dia.) 900 mm

LUMINAIRES (LIGHTING FIXTURES), LAMPHOLDERS, AND LAMPS Branch Circuit Conductors and Ballasts Branch circuit conductors shall be within ______(mm) from the ballasts with temperature rating not lower than _____C.

75 mm 90°C

LUMINAIRES (LIGHTING FIXTURES), LAMPHOLDERS, AND LAMPS Lighting Track A manufactured assembly designed to support and energize luminaires (lighting fixtures) that are capable of being readily repositioned on the track. Its length can be _______ by the addition or subtraction of sections of track.

altered

APPLIANCES Provisions for appliances (In General): Shall not be less than _____% of the marked rating for motor-operated appliances. Shall not be less than _____% of the marked rating rated at continuous loading.

125% 100%

APPLIANCES Overcurrent Protection a) Household-Type Appliances with Surface Heating Elements - With a maximum demand of more than ___A, it must have __ or more circuits for power supply with protection rated at not over ___A.

60A 2 50A

APPLIANCES Overcurrent Protection b) Infrared Lamp Commercial and Industrial Heating Appliances - Shall have an overcurrent protection not exceeding ___A.

50A

APPLIANCES Overcurrent Protection c) Single Non-motor-Operated Appliance  Shall not exceed the __________ marked on the appliance.  Shall not exceed ____A rating if the current is ___A or less.

nameplate rating 20A 13.3A

APPLIANCES Fixed Electric Space Heating Marking of Heating Cables  120 volt, nominal —

yellow

APPLIANCES Fixed Electric Space Heating Marking of Heating Cables Clearances of Wiring in Ceilings - Wiring shall not be less than _______(mm) above the heated ceiling with an ambient temperature of _____C .

50 mm 50°C

APPLIANCES Fixed Electric Space Heating Marking of Heating Cables  208 volt, nominal —

blue

APPLIANCES Fixed Electric Space Heating Marking of Heating Cables  240 volt, nominal —

red

APPLIANCES Fixed Electric Space Heating Marking of Heating Cables  277 volt, nominal —

brown

APPLIANCES Fixed Electric Space Heating Marking of Heating Cables  480 volt, nominal —

orange

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Part Winding Transformer a) Started by energizing first its ______ winding, and subsequently the remainder of this winding in one or more steps. b) ___ of its primary winding can be energized initially, and the other half follows in one or more steps. c) A ___________ shall not be considered a std. part-winding start induction motor.

primary (armature) 1/2 hermetic refrigerant compressor

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Ampacity and Motor Rating Determination General Motor Applications - Motors considered are low speeds when less than ______rpm.

1200 RPM

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Ampacity and Motor Rating Determination General Motor Applications ________ - Low Torque, Lower Full-Load Current

High Speed

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Ampacity and Motor Rating Determination General Motor Applications _________- High Torque, Higher Full-Load Current

Low Speed

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Ampacity and Motor Rating Determination General Motor Applications Torque Motors - The rated current shall be the ______

locked-rotor current

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Marking on Motors and Multi-motor Equipment (15)

1. Manufacturer’s name 2. Rated volts and full-load current 3. Rated frequency and number of phases if an ac motor 4. Rated full-load speed 5. Rated temperature rise or the insulation system class and rated ambient temperature 6. Time rating. The time rating shall be 5, 15, 30, or 60 minutes, or continuous 7. Rated horsepower if 1/8 hp or more 8. Code letter or locked-rotor amperes if an alternating-current 9. Design letter for design B, C, or D motors 10. Secondary volts and full-load current if a wound-rotor induction motor 11. Field current and voltage for dc excited synchronous motors 12. Winding - straight shunt, stabilized shunt, compound, or series, if a dc motor. Fractional horsepower dc motors 180 mm or less in diameter shall not be required to be marked. 13. Thermal Protection Marking ―Thermally Protected‖ or ―T.P.‖ 14. ―Impedance Protected‖ ―Z.P.‖ for impedance protected motors 15. Motors equipped with electrically powered condensation prevention heaters shall be marked with the rated heater voltage, number of phases, and the rated power in watts

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Marking on Motors and Multi-motor Equipment The time rating shall be ______________ (5)

5, 15, 30, or 60 minutes, or continuous

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Marking on Motors and Multi-motor Equipment Rated horsepower if ___ or more

1/8 hp

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Marking on Motors and Multi-motor Equipment Thermal Protection Marking ―Thermally Protected‖ or ____ ―

T.P.‖

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Marking on Motors and Multi-motor Equipment Impedance Protected‖ ―____ for impedance protected motors

Z.P.‖

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Marking on Motors and Multi-motor Equipment Winding - straight shunt, stabilized shunt, compound, or series, if a dc motor. Fractional horsepower dc motors ________(mm) or less in diameter shall not be required to be marked.

180 mm

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Marking on Motors and Multi-motor Equipment ________ for design B, C, or D motors

Design letter

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Terminals a) Markings - The terminals shall be_______ if necessary. b) Conductors - The conductors shall be connected with _______ unless otherwise identified. c) Torque Requirements - ___n-m torque for screw-type pressure terminals with __________

marked or colored copper 0. 8 N-m 2. 0 mm2 (1.6 mm dia.)

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Single Motor (Selection of Branch-Circuit Conductors) a) General - The ampacity of branch circuit shall not be less than ____% of the motor’s full-load current. b) Multispeed Motor - The highest full-load current rating shall be the one shown on the motor______. c) Wye-Start, Delta-Run Motor - Shall be sized at ___% of the motor full load current. d) Part-Winding Motor - Shall be sized ___% of the motor full-load current. e) Other than Continuous Duty - Conductors for a motor used in short-time, intermittent, periodic, or varying duty application, shall have ampacity not less than the motor nameplate ________ rating. f) Separate Terminal Enclosure - Conductors between a stationary motor rated 1 hp or less shall be permitted to be smaller than ________(mm2) but not smaller than _________(mm2)

125% nameplate 58% 50% current 2. 0 mm2 (1.6 mm dia.) 0. 75 mm2 (1.0 mm dia.).

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Rating for Continuous-Duty Motors More Than 1 Horsepower Separate Overload Device • ___% - Marked with a service factor 1.15 or greater • ___% - Motors with a marked temperature rise 40°C • ____% - All other motors

125% 125% 115%

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Rating for Continuous-Duty Motors More Than 1 Horsepower Thermal Protector * ___%- Full-load current of 9A or less * ___% - Full-load current of 9.1 to 20 amperes * ___% - Full-load current greater than 20 amperes

170% 156% 140%

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Rating for Continuous-Duty Motors More Than 1 Horsepower Integral with Motor - Shall protect the motor against damage due to ________

failure to start.

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Rating for Continuous-Duty Motors More Than 1 Horsepower Larger than 1500HP - Shall have an _____________

OCD having embedded temperature detectors

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Rating for Continuous-Duty Motors One Horsepower or Less, Automatically Started (4)

1. Separate Overload Device 2. Thermal Protector 3. Integral with Motor 4. Impedance-Protected

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Rating for Continuous-Duty Motors c) Selection of Overload Relay  ___% - Marked with a service factor of 1.15 or greater  ___% - Motors with a marked temperature rise 40°C  ____% - All other motors

140% 140% 130%

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS __________An overload device that can restart a motor automatically after overload tripping shall not be installed unless approved if automatic restarting may result in injury to persons.

Automatic Restarting

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Disconnecting Means Location Individual _________ shall be provided for each controller. Motor - Disconnecting means shall be located ______of the motor location.

disconnecting means in sight

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Disconnecting Means Operation - The disconnecting means shall open all ________ supply conductors and shall be designed so that no pole can be operated independently.

ungrounded

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Disconnecting Means Shall have at least one of the disconnecting means be __________

readily accessible.

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Disconnecting Means Types - The types of disconnecting means shall be specified by the ff: (9)

1. Motor Circuit Switch 2. Molded Case Circuit Breaker 3. Molded Case Switch 4. Instantaneous Trip Circuit Breaker 5. Self-Protected Combination Controller 6. Manual Motor Controller - shall be marked ―Suitable as Motor Disconnect‖ 7. System Isolation Equipment 8. Stationary Motor of 1/8HP or Less - the branch circuit overcurrent device 9. Autotransformer-Type Controlled Motor - for motors 2HP to 100HP

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Disconnecting Means _____________- for motors 2HP to 100HP

Autotransformer-Type Controlled Motor

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Disconnecting Means Ampere Rating and Interrupting Capacity - Shall not be less than ______% of the full-load current rating of the motor, _____, nominal.

115% 600 volts

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Disconnecting Means Switch or Circuit Breaker as Both Controller and Disconnecting Means _________ Shall be operable directly by hand on the lever or handle.

Air-Break Switch

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Disconnecting Means Switch or Circuit Breaker as Both Controller and Disconnecting Means _________ Shall be operable by hand; manually and power operable.

Inverse Time Circuit Breaker

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Disconnecting Means Switch or Circuit Breaker as Both Controller and Disconnecting Means Oil Switch - The rating shall not exceed _________V or _______A.

600 volts | 100 amperes

AIR-CONDITIONING AND REFRIGERATING EQUIPMENT Branch Circuit Conductors Single Motor-Compressor - Compressors shall have a rating of ____% ampacity of the full-load current. Wye-Start, Delta-Run Connected Motor-Compressor - Shall have a rating of ___ % ampacity of the full- load rated current.

125% 72%

GENERATORS Marking Each generator shall be provided with a nameplate with the following information: (12)

* Manufacturer’s Name * Rated Frequency * Power Factor * Nominal Volts and Amperes * Rated Speed (RPM) * Insulation System Class * KW or KVA Rating * Time Rating * Rated Ambient Temperature * Temperature Rise * Number of Phase if AC * Subtransient and Transient Impedances

GENERATORS Overcurrent Protection (Required) Constant-Voltage Generators - Shall be protected from overloads by __________ (2)

inherent design, CB, fuses, etc.

GENERATORS Overcurrent Protection (Required)`` Two-Wire Generator - Shall be permitted to have an OCP in ___ conductor only.

one

GENERATORS Overcurrent Protection (Required) 65 Volts or Less - Shall be protected to not deliver more than ___% of the full-load current.

150%

GENERATORS Overcurrent Protection (Required) Balancer Sets - Two wire, dc generators used in conjunction with balancer sets.

....

GENERATORS Overcurrent Protection (Required) Three-Wire, DC Generators - Whether compound or shunt wound, _________ shall be installed, ___ for each armature lead.

overcurrent protection one

GENERATORS Ampacity of Conductors Shall be protected not less than ___% of the nameplate current rating of the generator

115%

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Autotransformers 600 Volts, Nominal, or Less Shall be protected by an OCD not less than ___% of the rated full-load current

125%

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) __________A circuit operating at 600 volts, nominal, or less between phases.

Secondary Ties

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Marking Each transformer shall be provided with a nameplate with the following information:

* Manufacturer’s Name * Rated Frequency * Primary and Secondary Voltage * Rated Kilovolt-Ampere (KVA) * Impedance for 25KVA size and larger * Required Clearances for Transformers with Ventilating Opening * Amount and Kind of Insulating Liquid * Temperature Class for the Insulation System

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Specific Provisions Applicable to Different Types of Transformers Dry-Type Transformers Installed Indoors 1. Not Over 112 ½ KVA - Shall have a separation of at least ____ from combustible material unless separated from the combustible materials by a fire-resistant, heat-insulated barrier. 2. Over 112 ½ KVA - Shall be installed in a transformer room of ________ construction. 3. Over 35,000 Volts - Transformers shall be installed in a ______.

300 mm fire resistant vault room

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Specific Provisions Applicable to Different Types of Transformers Dry-Type Transformers Installed Outdoors - Transformers shall have a _____enclosure, not located within _____(mm) of combustible materials unless it has a ____ insulation systems or higher.

weatherproof 300 mm Class 155

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Specific Provisions Applicable to Different Types of Transformers Less-Flammable Liquid-Insulated Transformers - Insulated and has fire point not less than _____C. 1. ___________ - Permitted as long as the following conditions are met: • In Type I or Type II buildings - The transformer is rated 35kV or less - No combustible materials are stored - A liquid confinement area is provided • With an automatic fire extinguishing system and liquid confinement area 2. ________- less flammable, liquid-filled transformers installed adjacent to, or on the roof

300°C Indoor Installations Outdoor Installations

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Specific Provisions Applicable to Different Types of Transformers Nonflammable Fluid-Insulated Transformers - Shall be installed in a _____ and furnished with a ______ and a pressure-relief vent. It shall be also furnished with a means for absorbing gases generated by _____ inside the tank.

vault liquid confinement area arcing

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Specific Provisions Applicable to Different Types of Transformers e) Askarel-Insulated Transformers Installed Indoors - Furnished with a ___________.

pressure-relief vent

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Specific Provisions Applicable to Different Types of Transformers Oil-Insulated Transformers Installed Indoors - Shall be installed in a _____.

vault

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Specific Provisions Applicable to Different Types of Transformers Oil-Insulated Transformers Installed Outdoors - Shall be safeguarded from _____________________ (6)

combustible material, combustible buildings, and parts of buildings, fire escapes, and door and window openings.

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults Location - Can be ventilated to the outside air without using _______.

flues or ducts

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults Storage in Vaults - The materials should not be _________ in the transformer vaults

installed

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults Water Pipes and Accessories - No _______ system shall enter or pass through the vault. Piping for vault fire protection, or for transformer cooling is allowed

pipe or duct

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults Drainage - Shall be provided for _____kVA transformer capacities that will carry off any accumulation of oil or water in the vault.

100KVA

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults ________ - Shall be constructed of fire-resistant material.

Ducts

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults Dampers - With automatic closing fire dampers with fire rating of not less than ______ hours

1½ hours.

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults - ventilation opening Coverings - Covered with durable __________(3)

gratings, screens, or louvers.

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults- ventilation opening Size - If ventilated by natural circulation, the combined area of openings__________mm per kva and not less than ___m2 for any capacity under ____kva.

(1900 mm2 per KVA) 0.1 m2 50KVA

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults- ventilation opening Locations - As far as possible from doors, windows, fire escapes, and combustible materials.

doors, windows, fire escapes, and combustible materials.

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults - doorways Type of Door - Tight-fitting door with fire rating of _____hrs

3 hours.

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults -doorways Sills - Has a height of not less than _____(mm).

100 mm

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults -doorways Locks - Rooms shall be kept locked and only ____________is allowed

licensed electrical practitioner

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES) Transformer Vaults Walls, Roofs, and Floors - Materials for the walls and roofs shall have adequate mechanical strength with fire resistance of ____hrs. The floors of the vault made in concrete shall not be less than _____(mm) thick and has an adequate structural strength with fire resistance of 3 hours.

3 hours 100 mm

CAPACITORS Enclosing and Guarding Capacitors containing more than ______L of flammable liquid shall be _____ in vaults or outdoor fenced enclosures.

11L (3 gal) enclosed

CAPACITORS 600 Volts, Nominal, Under Time of Discharge - The residual voltage shall be reduced to ____(mm), nominal, or less within 1 minute after the capacitor is disconnected from the source of supply.

50 volts

CAPACITORS 600 Volts, Nominal, Under Conductors - The ampacity of the conductors shall not be less than ____% of the rated current.

135%

CAPACITORS 600 Volts, Nominal, Under Disconnecting Means - The disconnecting means shall open _________ simultaneously and be rated __% of the rated current.

all ungrounded conductors 135%

CAPACITORS 600 Volts, Nominal, Under Marking (6)

* Manufacturer’s Name * Rated Frequency * Rated Kilovar or Amperes * Number of Phases * Volume of Liquid (if filled w/ liquid) * Rated Voltage

CAPACITORS Over 600 Volts, Nominal a) Switching - Group-operated switches shall be used for capacitor switching and be the ff: (4)

1. Carrying continuously not less than 135% of the rated capacitor current. 2. Interrupting the maximum continuous load current of each load. 3. Withstanding the maximum inrush current. 4. Carrying currents due to faults on capacitors side of switch.

CAPACITORS Over 600 Volts, Nominal Additional Requirements for Series Capacitors (3)

1. Mechanically sequenced isolating and bypass switches 2. Interlocks 3. Switching procedure prominently displayed at the switching locations

CAPACITORS Over 600 Volts, Nominal Identification - Each capacitor shall have a nameplate with the following information: (6)

* Manufacturer’s Name * Rated Frequency * Rated Kilovar or Amperes * Number of Phases * Volume of Liquid (if filled w/ liquid) * Rated Voltage

CAPACITORS Over 600 Volts, Nominal Time of Discharge - The residual voltage shall be reduced to _____V, nominal, or less within____mins after the capacitor is disconnected from the source of supply.

50 volts 5 minute

RESISTORS AND REACTORS Space Separation 600 Volts or Less - A thermal barrier within ______(mm) of any combustible material. Over 600 Volts - Shall have a clearance of _______(mm) from combustible material.

300 mm 305 mm (12 in.)

RESISTORS AND REACTORS Conductor Insulation - Conductor insulation shall be suitable for operating in temperature of not less than___ (C)

90°C.

STORAGE BATTERIES Nominal Battery Voltage Lead-Acid Type - _____v/cell for the lead-acid type Alkali Type - _____v/cell

2V/cell 1.2V/cell

STORAGE BATTERIES Sealed Cell or Battery A sealed cell or battery is one that has no provision for the addition of water or electrolyte or for external measurement of electrolyte ________

specific gravity

STORAGE BATTERIES Storage Battery A ______ comprised of one or more rechargeable cells of the lead-acid, nickel-cadmium, or other rechargeable electrochemical types.

battery

PEC CHAPTER 4 EQUIPMENT FOR GENERAL USE Flashcards

(122 cards)