Module Two - Managing Electrical Hazards - NCCER Substation Slides

1. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
National Center
for Construction
Education and
Research
Slide 0
Slide 0
Managing Electrical Hazards
Module Two – 26501-12

2. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
National Center
for Construction
Education and
Research
Slide 1
Slide 1
Upon completion of this module, you will be able to do the following:
1. Identify electrical hazard types and locations, and explain related
safety guidelines and terms.
2. Recognize and explain hazard boundaries.
3. Explain employer and employee responsibilities in recognizing and
managing electrical hazards.
4. Identify common factors that lead to electrical incidents and explain
the importance of using good judgment, appropriate procedures,
and safe work practices.
5. Analyze the electrical hazards of a given task, plan the job, and
complete an electrical work permit request.
6. Select, inspect, and maintain personal protective equipment (PPE)
and test equipment used for electrical work.
7. Explain how to create an electrically safe work condition.
Objectives

3. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Education and
Research
Slide 2
Slide 2
Under supervision of the instructor, you should be able to:
1. Given a specific electrical task and circumstances, complete an
energized electrical work permit request.
Performance Tasks

4. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Education and
Research
Slide 3
Slide 3 Figure 1 – Power distribution system

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Research
Slide 4
Slide 4 Figure 2 – Human body typical resistances

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Research
Slide 5
Slide 5 Table 1 – Effects of Current on the Human Body

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
National Center
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Research
Slide 6
Slide 6 Figure 3 – Arc flash

8. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Research
Slide 7
Slide 7 Figure 4 – Electrical substation

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Research
Slide 8
Slide 8 Figure 5 – Typical substation equipment

10. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Research
Slide 9
Slide 9 Figure 6 – Pad-mounted service disconnects

11. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 10
Slide 10 Figure 7 – Service equipment warning label

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 11
Slide 11 Figure 8 – Transformers

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Research
Slide 12
Slide 12 Figure 9 – Switchgear enclosure

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Research
Slide 13
Slide 13 Figure 10 – Equipment damage caused by rodent entry

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 14
Slide 14 Figure 11 – Infrared imaging device

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 15
Slide 15 Figure 12 – Circuit breaker carriage

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 16
Slide 16 Figure 13 – Robotic device used to control a circuit breaker carriage

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 17
Slide 17 Figure 14 – Motor control center

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 18
Slide 18 Figure 15 – Effects of flash between bus and bucket

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 19
Slide 19 Figure 16 – Cable tray

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 20
Slide 20 Figure 17 – Busway

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 21
Slide 21 Figure 18 – Breaker enclosures with covers removed

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 22
Slide 22 Figure 19 – Terminal cabinets and junction boxes

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 23
Slide 23 Figure 20 – Field-mounted safety switches

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 24
Slide 24 Figure 21 – Engine-generator set

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 25
Slide 25 Figure 22 – Transfer switchgear

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 26
Slide 26 Figure 23 – UPS batteries

28. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 27
Slide 27 Figure 24 – Approach limits

29. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Research
Slide 28
Slide 28 Figure 25 – Arc flash

30. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
National Center
for Construction
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Research
Slide 29
Slide 29 Table 2 – Approach Boundaries to Energized Electrical Conductors or Circuit Parts for
Shock Protection for Alternating-Current Systems [Data from 70E Table 130.4(C)(a)]

31. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Research
Slide 30
Slide 30 Figure 26 – Worker using appropriate PPE

32. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 31
Slide 31 Figure 27 – Electrical hazard warning label

33. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 32
Slide 32 Figure 28 – Various types of PPE

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 33
Slide 33 Figure 29 – Balaclava (sock hood)

35. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 34
Slide 34 Figure 30 – Newer arc hoods offer improved comfort and visibility

36. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 35
Slide 35 Figure 31 – Voltage rating codes of gloves

37. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 36
Slide 36 Figure 32 – Glove inspection

38. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 37
Slide 37 Figure 33 – Rubber glove on a glove inflator

39. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 38
Slide 38 Figure 34 – Rubber blanket

40. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 39
Slide 39 Figure 35 – Temporary grounding jumpers in place on incoming feeders

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 40
Slide 40 Figure 36 – Hot stick in use

42. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 41
Slide 41 Figure 37 – Grounding mat in use

43. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 42
Slide 42 Figure 38 – Sample energized electrical work permit

44. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 43
Slide 43 Figure 39 – Simplified version of a single-line power distribution drawing

45. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 44
Slide 44 Figure 40 – Burn survival probabilities

46. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 45
Slide 45 Figure 41 – Body percentage areas (Rule of 9s)

47. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 46
Slide 46 Figure 42 – PPE calorie markings

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 47
Slide 47 Table 3 – Required Available Fault Current

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 48
Slide 48 Figure 43 – Simplified single-line diagram of 480V, three-phase electrical supply

50. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 49
Slide 49 Figure 44 – Trip settings on a low-voltage power circuit breaker

51. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 50
Slide 50 Table 4 – Detailed Flash Hazard Analysis for Example Drawing

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 51
Slide 51 Figure 45 – Megohmmeters

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 52
Slide 52 Figure 46 – Self-testing audio/visual voltage detector

54. Copyright © by NCCER,
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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 53
Slide 53 Figure 47 – Clamp-on multimeter with test lead finger guards

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 54
Slide 54 Table 5 – Overvoltage Installation Categories

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 55
Slide 55 Figure 48 – Meter category rating

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 56
Slide 56 Figure 49 – Lockout/tagout devices

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 57
Slide 57 Figure 50 – Insulated rescue hook

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 58
Slide 58
Supplemental Art

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
Module 26501-12
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Slide 59
Slide 59 Course Map

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Power Line Worker Level Two: Substation – Managing Electrical Hazards
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Slide 60
Slide 60