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Flashcards in PEC CHAPTER 4 EQUIPMENT FOR GENERAL USE Deck (122):
1

FIXTURE WIRES

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


0.75 mm2 (1.2 mm dia.)

2

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

3

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

4

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

5

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

6

SWITCHES

Knife Switches

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

Isolating Switches / To Interrupt Currents

7

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

8

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,

9

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

10

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

11

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

12

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

13

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

14

RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Mounting

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

Receptacles in Countertops

15

RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Mounting

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


Exposed Terminals

16

RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

Receptacle Faceplates (Cover Plates)

1. Thickness of Metal Faceplates -
Ferrous Metal ______(mm) ; Nonferrous Metal ______(mm)

2. Grounding - Metal faceplates shall be _______.

3. 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

17

SWITCHBOARDS AND PANELBOARDS

Supports and Arrangement of Busbars and Conductors (3)

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

18

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

19

SWITCHBOARDS AND PANELBOARDS

Panelboards

a) Classification of Panelboards (2)

1. 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.

2. Power Panelboard
- Shall have __% or fewer overcurrent devices protect lighting and appliance branch circuits.

30 ampere

10%

10%

20

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

21

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









22

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

23

SWITCHBOARDS AND PANELBOARDS

Panel Boards

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

200A

24

SWITCHBOARDS AND PANELBOARDS

Panel Boards

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

secondary side

25

SWITCHBOARDS AND PANELBOARDS

Panel Boards

 _______- Shall be secured in place by an additional fastener.

Back-Fed Devices

26

SWITCHBOARDS AND PANELBOARDS

Panel Boards

 _______ - Shall not be installed in the panelboards.

Delta Breakers

27

INDUSTRIAL CONTROL PANEL

Minimum Size and Ampacity

Industrial control panels shall be rated ____% of the full-load current.

125%

28

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

29

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

30

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

31

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

32

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

33

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

34

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

35

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

36

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

37

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%

38

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


39

APPLIANCES

Overcurrent Protection

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

50A

40

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

41

APPLIANCES

Fixed Electric Space Heating

Marking of Heating Cables
 120 volt, nominal —

yellow

42

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

43

APPLIANCES

Fixed Electric Space Heating

Marking of Heating Cables
 208 volt, nominal —

blue

44

APPLIANCES

Fixed Electric Space Heating

Marking of Heating Cables
 240 volt, nominal —

red

45

APPLIANCES

Fixed Electric Space Heating

Marking of Heating Cables
 277 volt, nominal —

brown

46

APPLIANCES

Fixed Electric Space Heating

Marking of Heating Cables
 480 volt, nominal —

orange

47

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

48

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Ampacity and Motor Rating Determination

General Motor Applications - Motors considered are low speeds when less than ______rpm.

1200 RPM


49

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Ampacity and Motor Rating Determination

General Motor Applications

________ - Low Torque, Lower Full-Load Current

High Speed

50

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Ampacity and Motor Rating Determination

General Motor Applications

_________- High Torque, Higher Full-Load Current

Low Speed

51

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Ampacity and Motor Rating Determination

General Motor Applications

Torque Motors - The rated current shall be the ______

locked-rotor current

52

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

53

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

54

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Marking on Motors and Multi-motor Equipment

Rated horsepower if ___ or more

1/8 hp

55

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Marking on Motors and Multi-motor Equipment

Thermal Protection Marking ―Thermally Protected‖ or ____ ―

T.P.‖

56

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Marking on Motors and Multi-motor Equipment

Impedance Protected‖ ―____ for impedance protected motors

Z.P.‖

57

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

58

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Marking on Motors and Multi-motor Equipment

________ for design B, C, or D motors

Design letter

59

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.)

60

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.).

61

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%

62

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%

63

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.

64

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

65

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

66

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%

67

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

68

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

69

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

70

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Disconnecting Means

Shall have at least one of the disconnecting means be __________

readily accessible.

71

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

72

MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

Disconnecting Means

_____________- for motors 2HP to 100HP


Autotransformer-Type Controlled Motor

73

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

74

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



75

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

76

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

77

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%

78

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

79

GENERATORS

Overcurrent Protection (Required)

Constant-Voltage Generators - Shall be protected from overloads by __________ (2)

inherent design, CB, fuses, etc.

80

GENERATORS

Overcurrent Protection (Required)``

Two-Wire Generator - Shall be permitted to have an OCP in ___ conductor only.

one

81

GENERATORS

Overcurrent Protection (Required)

65 Volts or Less - Shall be protected to not deliver more than ___% of the full-load current.

150%

82

GENERATORS

Overcurrent Protection (Required)

Balancer Sets - Two wire, dc generators used in conjunction with balancer sets.

....

83

GENERATORS

Overcurrent Protection (Required)

Three-Wire, DC Generators - Whether compound or shunt wound, _________ shall be installed, ___ for each armature lead.

overcurrent protection

one

84

GENERATORS

Ampacity of Conductors

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

115%

85

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%

86

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES)

__________A circuit operating at 600 volts, nominal, or less between phases.


Secondary Ties

87

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

88

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

89

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

90

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

91

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

92

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

93

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

94

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.

95

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES)

Transformer Vaults

Location - Can be ventilated to the outside air without using _______.

flues or ducts




























96

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES)

Transformer Vaults

Storage in Vaults - The materials should not be _________ in the transformer vaults

installed

97

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

98

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

99

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES)

Transformer Vaults

________ - Shall be constructed of fire-resistant material.

Ducts

100

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.

101

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES)

Transformer Vaults - ventilation opening

Coverings - Covered with durable __________(3)

gratings, screens, or louvers.

102

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

103

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.

104

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES)

Transformer Vaults - doorways

Type of Door - Tight-fitting door with fire rating of _____hrs

3 hours.



105

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES)

Transformer Vaults -doorways

Sills - Has a height of not less than _____(mm).

100 mm

106

TRANSFORMERS AND TRANSFOMER VAULTS (INCLUDING SECONDARY TIES)

Transformer Vaults -doorways

Locks - Rooms shall be kept locked and only ____________is allowed

licensed electrical practitioner

107

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

108

CAPACITORS

Enclosing and Guarding

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


11L (3 gal)

enclosed

109

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

110

CAPACITORS

600 Volts, Nominal, Under

Conductors - The ampacity of the conductors shall not be less than ____% of the rated current.

135%

111

CAPACITORS

600 Volts, Nominal, Under

Disconnecting Means - The disconnecting means shall open _________ simultaneously and be rated __% of the rated current.

all ungrounded conductors

135%

112

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

113

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.

114

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

115

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

116

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

117

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.)

118

RESISTORS AND REACTORS

Conductor Insulation

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

90°C.

119

STORAGE BATTERIES

Nominal Battery Voltage

Lead-Acid Type - _____v/cell for the lead-acid type

Alkali Type - _____v/cell

2V/cell

1.2V/cell

120

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

121

STORAGE BATTERIES

Storage Battery

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

battery

122

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