INTRODUCTIONS

1
Module 3
Evaluating Electrical Risk Factors
2
Recognize
Control
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
Module Objectives

• Recognize how to conduct a fall hazard evaluation.

• Given a case study, analyze the hazards and
  recommend improvements.

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
Methods for Evaluating Arc Flash
NFPA 70E Equations and Tables
IEEE Standard 1584
Software Programs
Electrical System Analysis
7
Limits of Approach
Exposed Energized Part
Prohibited Approach Boundary
Flash Protection Boundary
Restricted Approach Boundary
Limited Approach Boundary
Note that the outer boundary is for flash
protection. All other boundaries are for shock
protection.
8
Flash Protection Zone

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

9
Limited Approach Zone

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

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
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 parts required

12
Using the NFPA Tables
Panelboards rated 240v and below
Task Hazard/Risk V-Rated V-Rated
Category Gloves Tools
Circuit breaker (CB) or fused switch
operation with covers on
0 N N
Work on energized parts, including voltage
testing 1 Y
Y
Remove or install circuit breakers or fused
switches 1 Y
Y
When you use this table, ALL corresponding notes
must be taken into consideration.
13
Using the NFPA Tables
600v Class Motor Control Centers
Task Hazard/Risk V-Rated V-Rated
Category Gloves Tools
Work on energized parts, including voltage
testing 2 Y
Y
Insertion or removal of individual starter
buckets from the motor control center
3
Y N
Application of safety grounds, after voltage test
3 Y N
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
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
Steps for Task Analysis

1. Obtain or create drawings and other documents
   pertaining to the electrical system(s) that will
   be involved.
2. Identify the hazards associated with the
   job/project.

16
Steps for Task Analysis

1. Agree on safety procedures that everyone will
   follow.
2. Determine the proper tools that need to be used
   for the job/project.
3. Determine the PPE that must be used for the
   job/project.

17
Fall Hazards
Why is it important to consider falls when
evaluating electrical safety?
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
Planning for Your Small Business
Action Potential Barriers Overcoming the Barriers