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PEC 11 - 15 > PEC 12 > Flashcards

PEC 12 Flashcards

1
Q

For all single-phase motors, to protect them from short circuits and ground faults, a multiplying factor of _____ of its full load current rating shall be used the protective device selected is a non-time delay fuse and _____ if the protective device is a time delay fuse.

A

300%, 175%

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2
Q

Flexible metal conduit shall be supported within ____ on each side of every outlet box, junction box, cabinet or fitting.

A

300 mm

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3
Q

The maximum electrical trade size of electrical metallic tubing shall be_____.

A

100 mm

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4
Q

For installations of 2.0 mm2 conductors in 600-v circuits, what is the minimum insulation resistance allowed by the Philippine Electrical Code?

A

500,000 Ω

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5
Q

Askarel insulated transformers installed indoors and rated over ____ kVA shall be furnished with a pressure relief vent.

A

25

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6
Q

In straight pulls, the length of the pull box shall not be less than _____ times the trade diameter of the largest raceway.

A

8

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7
Q

Busways shall be securely supported at intervals NOT exceeding ____ unless otherwise designed and marked.

A

1,500 mm

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8
Q

The smallest electrical trade size of a liquidtight flexible non-metallic conduit shall be.

A

20 mm

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9
Q

Boxes intended to enclose flush devices shall have an internal depth of NOT less than ____.

A

24 mm

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10
Q

A branch circuit supplying a fixed storage type water heater having a capacity of 450 liters or less shall have a rating not less than _____ of the nameplate rating of the water heater.

A

125%

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11
Q

Defined as the shortest distance measured between a point on the top surface of any direct buried conductor, cable, conduit and the top surface of finish grade.

A

Cover

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12
Q

A wall screen or fence less than ____ in height shall NOT be considered as a preventing access unless it has other features that provide a degree of isolation equivalent to the height of the fence in question.

A

2,500 mm

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13
Q

Branch circuit conductors supplying a single phase motor shall have an ampacity NOT exceeding

A

125%

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14
Q

Pits within ____ horizontally from the flammable vapor source, shall be considered a hazardous location under Class I, Division I location

A

7,600 mm

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15
Q

Type TW conductor is a ____ type.

A. moisture and heat resistant

B. moisture and heat resistant thermoplastic

C. moisture resistant and thermoplastic

D. heat resistant and thermoplastic

A

C. moisture resistant and thermoplastic

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16
Q

The current in amperes a conductor can carry continuously under the conditions of use without exceeding its temperature rating

A

Ampacity

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17
Q

Flat conductor cables maybe installed in any of the following location EXCEPT one. Which one is this?

A

In wet locations

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18
Q

Operation of loads and intervals of time both of which maybe subject to wide

A

Varying duty

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19
Q

For equipment rated 1200 A and over 1,900 mm wide containing overcurrent devices and control devices at least one entrance of NOT less than ____ wide and ____ high shall be provided at each end.

A

600 mm, 2,000 mm

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20
Q

Batteries and direct current circuits shall be physically separated by at least a ___ gap or other approved means from circuits of a different power source.

A

12 mm

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21
Q

Where contactors are used as the disconnecting means for fuses an individually externally operable switch, such as tumbler switch for the control of each contractor shall be located at a distance of not more than ____ from the contactor.

A

1,800 mm

22
Q

No electrical installation, alteration and or addition shall be connected or reconnected to any power supply or any other source of electrical energy without

A. an electrical permit

B. an application for inspection

C. certificate of payment

D. certificate of final inspection

A

D. certificate of final inspection

23
Q

Four (4) 3-phase motor are supplied by one common feeder cable. The full load current ratings of the motors are 10 A, 20 A, 30 A, and 40 A. What should be the minimum ampacity of the feeder cable?

A

110 A

24
Q

Thermal barrier shall be required if the space between the resistors and reactors and any combustible material is less than ____.

A

300 mm

25
Q

The ampacity of conductors that connect a capacitor to the terminals of a motor circuit conductor shall not be less than ____ the ampacity of the motor circuit conductors and in no case less than 135% of the rated capacitor current.

A

one-third

26
Q

he load for each ungrounded feeder and services conductor supplying 5 to 8 receptacles that supply shore power for boats shall be calculated as ____ of the sum of the rating of the receptacles.

A

90%

27
Q

A device actuated by the operation of some devices with which it is directly associated to govern succeeding operations of some or allied devices

A

Interlock

28
Q

The underground service conductors between the street main, including any risers at pole or other structure or from transformers and the first point of connection to the services entrance conductors.

A

Service lateral

29
Q

For 101 A to 200 A circuits, the minimum insulation required shall be____

A

50,000 ohms

30
Q

Which of the following is NOT a standard kVA rating of a single-phase transformer?

A

175

31
Q

For voltage above 600 V, the minimum insulation resistance shall be ____

A

1,000,000 ohms per kilovolt rating

32
Q

The rating of any cord and plug connected utilization equipment shall NOT exceed ____ of the branch circuit rating.

A

80%

33
Q

If there will six or more 2-wire branch circuits, the service disconnecting means shall NOT be smaller than ____.

A

100 A

34
Q

For direct current motors, the multiplying factor to be used in selecting the size of overcurrent device using an inverse time CB shall be____ percent of its full load current.

A

150

35
Q

pecifications written on the plans or submitted on separate standard size sheets shall show_____.

A. types of writing, i.e. service entrance, branch circuit, feeders, etc.

B. nature of electrical services, i.e. no. of phase, voltage, frequency, etc

C. special equipment5 to be installed indicating ratings

D. all of these
.

A

D. all of these

36
Q

An appliance which is fixed in one place to another in normal use

A. Fixed appliance

B. Stationary appliance

C. Portable appliance

D. None of these

A

B. Stationary appliance

37
Q

In starting a large DC motor, a starter is primarily used in order to
A. save electrical power

B. limit the starting current

C. add more power

D. reduce the voltage drop

A

B. limit the starting current

38
Q

Hazardous locations in which easily ignitable fibers are stored and handled.

A

Class III, Division 2

39
Q

In commercial garages, repair and storage areas, the entire area up to a level of ____ above the floor shall be considered to be Class I, Division 2 hazardous location

A

460 mm

40
Q

Conductors passing over roof surface, a vertical clearance of ____ shall be maintained.

A

2,500 mm

41
Q

What is the minimum vertical clearance for service drop conductors (not over 600 volts) above finished grade or sidewalks accessible only to pedestrians?

A

3100 mm

42
Q

Busways shall be permitted to be installed behind panels if means of access are provided and if the conditions below are met. One of them is NOT valid. Which one is this?

A. No over current are installed on the busway other than for an individual fixture

B. The busway is so installed that the joints between sections and fitting are accessible for maintenance purposes

C. The busway is open and of the ventilator type

D. The space behind the panels is not for air handling purposes

A

C. The busway is open and of the ventilator type

43
Q

The OCPD for resistance welders shall NOT exceed _____ of the conductor’s ampacity supplying the circuit.

A

300%

44
Q

For installations to supply only limited load of a single branch circuit, the service disconnecting means shall have a rating of NOT less than _____.

A

15 A

45
Q

Metal clad cable (MC) can be used in systems of 600 V or ____.
A. less

B. more

C. both A and B

D. neither A and B

A

more

46
Q

Open conductors passing over residential driveways and those commercial areas not subject to truck traffic where the voltage exceeds 300 V to ground shall have a vertical clearance of ____.

A

4,600 mm

47
Q

MC cable insulation have a maximum operating temperature of not less than ____.

A

90°C

48
Q

The ampacity of conductors in non-metallic sheathed cable shall be used at ____.

A

60°C

49
Q

What is the radius of a solid round conductor, which id the nearest equivalent of a stranded conductor whose total area is exactly 8.0 mm²?

A

3.191 mm

50
Q

For high impedance grounding, the system _____ conductor shall not be connected to the ground EXCEPT through the grounding impedance.

A. line

B. neutral

C. both A and B

D. neither A and B

A

neutral

PEC 11 - 15 (2 decks)

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