Module 3: Evaluating Electrical Risk Factors

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1. Slide 1

   Module

   • 3
   • Evaluating
   • Electrical Risk
   • Factors
2. Slide 2

   Recogni ze

   • Evaluate
   • Control
3. Slide 3

   Module Objectives

   • Recognize the purpose and various methods for evaluating arc flash. Identify arc flash approach boundaries and their meaning.
   • List the steps for conducting a task analysis.
4. Slide 4

   Module Objectives

   • Recognize how to conduct a fall hazard evaluation.
   • Given a case study, analyze the hazards and recommend improvements.
5. Slide 5

   Desired Outputs for Analyses

   • 1. To determine flash protection boundaries
   • 2. To determine incident energy
   • 3. To determine the hazard/risk category for PPE selection
6. Slide 6

   Methods for Evaluating Arc

   • Flash
   • NFPA 70E Equations and Tables
   • ftw
   • ram
   • IE
   • 15
   • Dc = [2.65 X MVAbf X
   • t]1/2
   • Electrical System
   • Analysis
7. Slide 7

   Limits of Approach

   • Prohibited Approach
   • Boundary
   • Restricted Approach
   • Boundary
   • Exposed Energized
   • Part
   • Flash Protection Boundary
   • Limited Approach
   • Boundary
   • Note that the outer boundary is for flash protection. All other boundaries are for shock protection.
8. Slide 8

   Flash Protection Zone

   • Outer zone of flash protection
   • Employees in this zone must wear flash protective equipment
9. Slide 9

   Limited Approach Zone

   • Only qualified people can enter this zone.
   • Must wear flash protective equipment
   • Unqualified workers prohibited
10. Slide 10

    Restricted Approach Zone

    • A person in this zone is in restricted space Qualified people only Approved written plan required
    • PPE required
    • Must keep as much of body out of restricted zone as possible
    • No body part may cross prohibited line
11. Slide 11

    Prohibited Approach Zone

    • Being in this zone is the same as being in contact with the live part
    • Qualified people only Must have specified training
    • Approved written plan and risk hazard analysis
    • PPE for working on live 3-11
12. Slide 12

    Using the NFPA Tables

    • Panelboards rated 240v
    • and below Hazard/Risk
    • Task
    • V-Rated
    • V-Rated
    • Category
    • Gloves
    • Circuit
    • breaker
    • (CB)
    • or
    • Tools
    • fused switch operation
    • with covers on
    • N on energized parts,
    • Work
    • including voltage testing
    • Remove or install circuit breakers or fused switches 1
    • When you use this table, ALL corresponding notes must be taken into consideration.
13. Slide 13

    Using the NFPA Tables

    • 600v Class Motor Control
    • Task Centers
    • Hazard/Risk
    • V-Rated
    • V-Rated
    • Category
    • Gloves
    • Work
    • on energized
    • parts,
    • Tools
    • including voltage testing
    • 2*
    • Y or removal of
    • Insertion
    • individual starter “buckets” from the motor control center
    • Application
    • of safety
    • grounds, after voltage test
    • *A double-layer switching hood and hearing protection are required for this task in addition to other
    • Category
    • 2 requirements.
    • Note:
    • When you
    • use this table, ALL
    • corresponding notes must be taken into consideration.
14. Slide 14

    Steps for Task Analysis

    • 1. Involve everyone who will work on the job/project.
    • 2. Identify every step that must be taken to complete the job/project.
    • 3. For each step, identify the electrical procedures that will be performed.
15. Slide 15

    Steps for Task Analysis

    • 4. Obtain or create drawings and other documents pertaining to the electrical system(s) that will be involved.
    • 5. Identify the hazards associated with the job/project.
16. Slide 16

    Steps for Task Analysis

    • 6. Agree on safety procedures that everyone will follow.
    • 7. Determine the proper tools that need to be used for the job/project.
    • 8. Determine the PPE that must be used for the job/project.
17. Slide 17

    Fall Hazards

    • Why is it important to consider falls when evaluating electrical safety?
18. Slide 18

    Case Study

    • What hazards were present in this situation?
    • What did the management and employees do wrong?
    • How could an incident like this have been prevented?
19. Slide 19

    Planning for Your Small

    • Action
    • Potential
    • Overcoming the
    • Business
    • Barriers
    • Barriers