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NLC ELP WLE > WLE Ch.1 > Flashcards

WLE Ch.1 Flashcards

1
Q

What are the three categories of electrical linework?

A

construction, maintenance, and repair

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2
Q

Describe construction electrical linework?

A

Building new facilities

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3
Q

Describe Maintenance electrical linework?

A

Performed on existing lines or equipment

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4
Q

Describe repair electrical linework?

A

involves existing lines and equipment but in an emergency situation

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5
Q

What area of OSHA does linework fall under?

A

construction or general industry

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6
Q

What are the two methods for working on the power delivery system?

A

Energized and de-energized

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7
Q

What condition is the line in energized work?

A

the line is hot and is operating at its normal or nominal voltage

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8
Q

What are the three common energized work processes?

A

Hot sticking, rubber gloving, and barehanding

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9
Q

De-energized work involves protection from what types of energy sources?

A

normal and abnormal sources

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10
Q

Majority of construction linework is what kind of work?

A

De-energized

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11
Q

Lines and equipment are considered de-energized after what three steps?

A

Disconnect, test, and properly ground

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12
Q

What does it mean to disconnect lines and equipment?

A

lines and equipment removed from normal source. All connections have been opened, locked, and tagged.

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13
Q

T or F: If you can visually see that the fuses are clearly open but the tester still shows the line is hot, it is okay to ground the lines.

A

False

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14
Q

What piece of equipment provides a low-resistance path to the best available ground.

A

Grounds

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15
Q

What is the best definition of de-energized?

A

All supply conductors have been tested for the absence of nominal voltage and grounded so that all phases share the same potential as the earth

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16
Q

T or F: After a line is de-energized it is only possible to be energized again by connecting it back to the source

A

False, there can be abnormal sources of energy

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17
Q

What are the two different grounding procedures?

A

EPZ grounding and bracket grounding

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18
Q

What does EPZ stand for?

A

Equipotential Zone

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19
Q

T or F: Voltage and potential are interchangeable terms.

A

True

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20
Q

Who qualifies you to perform either energized and/or de-energized work?

A

Your employer

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21
Q

Which path will current take?

A

Every available path to objects of different potential

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22
Q

T or F: Current takes the path of least resistance.

A

False

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23
Q

Who requires proof that a worker is trained and competent?

A

OSHA

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24
Q

What aspect of safety is focused on with regards to de-energized work?

A

Protecting workers in case the line becomes energized unexpectedly

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25
Q

What are the only two ways to completely prevent current flow through the lineworker?

A

insulate and isolate

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26
Q

Protective grounding and bonding are only effective if they do what two things?

A

minimize the time it takes to trip the circuit and limit current flow and voltage drop across the lineworker’s body

27
Q

When performing energized work, lineworkers follow what three principles to manage current?

A

Insulate, isolate, and protect from second point of contact

28
Q

What is used for transmission voltages: insulation or isolation

A

isolation

29
Q

T or F: The human body is a terrible conductor of electricity.

A

False

30
Q

How many amps does it take to burn skin and organs?

A

1 or higher

31
Q

How many amps does it take to put the heart in v-fib?

A

about 1/3

32
Q

What is a simple safety rule to live by in regards to current?

A

Regardless of voltage any amount is fatal

33
Q

What are the three major clearance objectives?

A

Ensure safety, Minimize negative impacts on the electrical system, and Minimize number affected by outages.

34
Q

What is step 1 for clearing lines and equipment?

A

Create clearance plan and confirm details, clearance holder

35
Q

What is step 2 for clearing lines and equipment?

A

Request clearance in writing, Clearance Holder

36
Q

What is step 3 for clearing lines and equipment?

A

Approve clearance and create a switching order, System operator

37
Q

What is step 4 for clearing lines and equipment?

A

Disconnect, lock, and tag all normal sources of energy, field operator

38
Q

What is step 5 for clearing lines and equipment?

A

Establish and issue clearance, system holder

39
Q

What is step 6 for clearing lines and equipment?

A

Test and apply protective grounds, complete work, clearance holder

40
Q

What is step 7 for clearing lines and equipment?

A

Verify work is completed. Release the clearance, clearance holder

41
Q

What is step 8 for clearing lines and equipment?

A

Return the system to normal. System/Field operator

42
Q

OSHA uses the term disconnecting means, what is that referring to?

A

clearance point

43
Q

What is a clearance point?

A

Any device that disconnects a line or piece of equipment from a normal source of energy

44
Q

Does OSHA require visual clearance points?

A

No

45
Q

Name all the types of clearance points.

A

Air switches, single-blade disconnect, open jumper, line recloser, and flying bells

46
Q

What should you do immediately after operating a switch?

A

Check the contact position of each phase

47
Q

Name the phenomenon. A nearby energy source electrifies a disconnected and de-energized conductor.

A

Induced voltage or induction

48
Q

What are some other elements that can effect induction?

A

proximity of lines, radio, television, and microwave towers can also cause induction

49
Q

Name the phenomenon. When electrical potential doesn’t leave the lines and equipment for some time.

A

Capacitance

50
Q

How long does OSHA require you to wait before grounding a disconnected capacitor?

A

5 minutes

51
Q

What is the one condition that stops line work?

A

Lightning

52
Q

Name the phenomenon. Charge builds up on the surface of a conductor when warm winds blows across it.

A

Static charge

53
Q

What are some common reasons for accidental energizing of the lines?

A

Unexpected operation of a connecting device, switch accidentally falls closed, generator backfeed, and energized lines contacting de-energized lines.

54
Q

Name the phenomenon? The amount of current that a given system can deliver to a short circuit.

A

Fault current

55
Q

What three things occur when a circuit experiences a fault?

A

Load bypassed, high amount of current flow, and exposure of the weakest point in the circuit

56
Q

What is important to consider when selecting the proper grounding components?

A

Size of the grounds. When speaking of fault currents, size matters

57
Q

What is step potential?

A

Voltage difference between the feet

58
Q

What is touch potential?

A

Voltage difference between the hands and the place you are standing

59
Q

T or F: Rubber gloves and rubber overshoes eliminate the hazards of step and touch potential.

A

False, they minimize but not eliminate

60
Q

T or F: OSHA does not require vehicle to be grounded

A

True, they only require vehicle barricading

61
Q

Who is issued clearance and is responsible for completing the work in the field.

A

Clearance holder

62
Q

This person gives the permission for a clearance to occur.

A

System operator

63
Q

The employee who is physically operating the disconnect devices.

A

Field Operator

NLC ELP WLE (2 decks)

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