Instructor/Participant Guide - Transit Training · General Electrical Safety Procedures. Transit Elevator/Escalator Consortium. Electrocution • Electrocution is a fatality resulting

209: Escalator: Electrical Systems

Module 1: General Electrical Safety Procedures

Instructor/Participant Guide

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Table of Contents: Introduction ...................................................................................... 1

Safety Oversight Resources ........................................................ 2 Electrical Safety ........................................................................... 3 Electrocution ................................................................................ 4 Burns ........................................................................................... 5 Effects of 60 HZ AC Current ........................................................ 6 Reducing Occupational Hazards .................................................. 7 Determining Boundary Level ........................................................ 8 Lockout/Tagout ............................................................................ 9 Electrical Cords and Equipment ................................................. 10 Emergency Response ................................................................ 11

Summary ....................................................................................... 12

Table of Figures: Figure 1: Effects of Electrical Shock ................................................. 5


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Icons Used in This Guide Throughout the Instructor’s Guide, the following icons indicate the type of content being presented.

Refer To

PowerPoint

Multimedia

Web based Training

Write

Ask

Individual Activity

Small Group Activity

Classroom Activity

Duration

Agenda Topic No. Topic Title Duration

1 Introduction 5 minutes

2 Safety Oversight Resources 15 minutes

3 Electrical Safety 20 minutes

4 Physiological Effects of Electrical Energy

• Electrocution • Electric Shock • Burns • Effects of 50HZ AC

Currents

20 minutes

5 Reducing Occupational Hazards

• Determining Boundary Levels

20 minutes

6 Safe Practices

• Lockout/Tagout

• Electrical Cords and Equipment

20 minutes

7 Emergency Response 15 minutes

8 Summary 5 minutes

Total Time: 2 hours


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Overview Purpose The purpose of this module is to:

• Introduce participants to general electrical safety procedures.

Objectives At the end of this chapter, the learner will be able to:

• Indentify General Safety Procedures • Relate Safe Work Practices to Escalator

Maintenance Materials Make sure you have the following:

• Laptop (one for leader) • Participant Guides • PowerPoint slide deck • LCD projector • A17.1 Safety Code for Elevators and

Escalators • A17.2 Guide for Inspection of Elevators,

Escalators and Moving Sidewalks • A17.3 Safety Code for Existing

Elevators and Escalators • Heavy Duty Transportation System

Elevator Design Guidelines (APTA RT-RP-FS 008-03)

• Heavy Duty Transportation System Escalator Design Guidelines (APTA RT-RP-FS 007-02)

• Field Employees’ Safety Handbook • Transit Agency Handbook

Preparation PREPARE flip charts with the following titles:

• Class Expectations


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Instructor’s Notes

Slide 1

General Electrical Safety Procedures

Transit Elevator/Escalator Consortium

Outline• Identify safety oversight sources.• Discuss and list the safety rules for avoiding electrical shock.• Explain shock protection boundaries of energized electrical

equipment.• Describe the types of PPE which may be required when working on

live equipment.• Describe several causes of electrical burns.• Demonstrate Lockout/Tagout (LOTO) Procedures.• Explain the reason for grounding of electrical equipment.• Determine dangerous levels of electrical current as it relates to the

human body.• Identify general safety practices.

2 Slide 2

GAIN audience attention by introducing yourself.

WELCOME the participants to the Escalator Specific: General Electrical Safety Procedures Module.

ASK the participants what their expectation is of the course.

WRITE their expectations on the board so they can see how they align to the course objectives.

DIRECT participants to the objectives on slide 2.

REVIEW the objectives on Slide 2.

Introduction Welcome to the Escalator Course: General Electrical Safety Procedures Module.

What are your expectations for this module?

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Instructor’s Notes General Electrical Safety Procedures


Safety Oversight Resources • National Fire Protection

Association• Occupational Safety and

Health Administration• American Society of

Mechanical Engineers

3 Slide 3

Slide 4

REVIEW the safety oversight resources and publications.

ASK the participants to list the purpose of each of the organizations described on the page.

Safety Oversight Resources List the purpose of each organization below.

National Fire Protection Association _______________________________________________

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Occupational Safety and Health Administration _______________________________________________

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American Society of Mechanical Engineers _______________________________________________

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Electrical Safety• 30,000 non-fatal electrical shock accidents occur each

year.• Electrocution is the fourth highest cause of industrial

fatalities. • Approximately 3000 flash burn incidents are reported

annually. • Approximately 200 deaths also occur.

5 Slide 5

Slide 6

REVIEW slides 5 and 6 in the PowerPoint presentation to discuss Electrical Safety.

ASK: participants to list the six steps for creating an electrically safe condition.

Electrical Safety List the six steps for creating an electrically safe condition.

1. _______________________________________________

2. _______________________________________________

3. _______________________________________________

4. _______________________________________________

5. _______________________________________________

6. _______________________________________________





Electrocution• Electrocution is a fatality resulting from an individual

being exposed to a lethal amount of electrical energy.• The human body becomes part of an active electrical

circuit having a current capable of over stimulating the nervous system and/or causing damage to internal organs.

7 Slide 7

Slide 8

REVIEW slides 7 and 8 and review electrocution and electrical shock.

An Electrical Foreman with over 20 years’ experience was working on a high-voltage circuit that he thought was de-energized. Unfortunately, he had de-energized the wrong circuit. He was thrown back by an arc flash/blast and received burns to his arm, neck, and face.

ASK participants to define Arc Flash and Arc Blast.

Electrocution Define the following:

Arc Flash _______________________________________________

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Arc Blast _______________________________________________

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Slide 9

Slide 11

REVIEW Slides 9 to 11, and review the types of burns and how they are caused.

ASK: What can occur with electrocution over 50mA?

CONTENT: Direct participants to describe in their own words what could occur with high voltage burns.

Burns

Figure 1: Effects of Electrical Shock




Slide 12

REVIEW slide 12 and review the types of burns and how they are caused.

APPLICATION FEEDBACK: now that we have discussed a little about the preventive maintenance procedures, have the participants answer the following question.

ASK: What can occur with electrocution over 50mA?

Effects of 60 HZ AC Current At what current do the following effects occur?

Sensation Threshold _______________________________________________

Cannot Let Go _______________________________________________

Muscular Paralysis _______________________________________________

Possible Death _______________________________________________

Ventricular Fibrillation Threshold _______________________________________________

Cardiac Standstill _______________________________________________




Slide 13



Hazards vs. PPEPotential Danger Appropriate PPE

Head injury from electric shock or burns due to contact with live parts or from flying objects resulting from electrical explosion.

Nonconductive head protection.

Exposure to electric arcs or flashes or from flying objects resulting from electrical explosion.

Nonconductive protective equipment for the:•Face, neck, chin – Face shield and Kevlar Hood or suit•Eyes – Safety glasses

Electric arc flash above the threshold incident-energy level for a second-degree burn.

Flame-resistant clothing (and items listed above). Make sure that when flame-resistant clothing is worn to protect an employee, it covers all ignitable clothing and allows for movement and visibility.

Hand and arm injury from electric shock due to contact with live parts. Rubber insulating gloves.

Possible exposure to arc flash burn. Hand and arm protection.Where insulated footwear is used as protection against step and touch potential.

Dielectric overshoes (ex: leather work boot shown in Figure 4).

14 Slide 14

REVIEW slides 13 and 14 and describe how to reduce occupational hazards. Specifically focus on the need for PPE.

ASK the participants to describe two specific processes for reducing occupational hazards.

POSSIBLE SMALL GROUP ACTIVITY: Split the class into 3 groups. Hand out images of PPE to participants. Ask each group to identify which PPE would be required for the following hazards:

Head injury from electric shock or burns.

Exposure to electric arcs and flashes.

Electric arc flash above the threshold incident-energy level for second degree burn.

Hand and arm injury from electric shock.

Exposure to arc flash burn.

Reducing Occupational Hazards How can occupational hazards be reduced?

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Slide 15

Slide 16

REVIEW slides 15 and 16 and describe how to determine an appropriate boundary level. Describe some safe practices to display during electrical work.

CONTENT: Direct participants to describe in their own words how to properly determine boundary levels.

APPLICATION FEEDBACK: Now that we have discussed a little about reducing occupational hazards, have the participants respond to the following topic.

ASK the participants to define the boundary levels.

Determining Boundary Level Define the following boundary levels.

Limited Approach Boundary _______________________________________________

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Restricted Approach Boundary

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Flash Protection Boundary _______________________________________________

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Prohibited (Shock) Boundary _______________________________________________

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Slide 17



Lockout/Tagout• After an electrical system has been locked out and

tagged, double-check to see if the voltage really has been secured in a zero state.

• To do so:– Try to Start the machine

• If the machine starts up when the Start switch or button is actuated, the machine is NOT secured.

– Check for the presence of dangerous voltage with a measuring device.

18 Slide 18

REVIEW slides 17 and 18 and describe Lockout/Tagout process for electrical equipment.

ASK the participants to describe how they can check for certain, that the electrical system they are working on has been secured in a zero state.

CONTENT: Direct participants to describe in their own words how to properly conduct lockout/tagout.

Lockout/Tagout How do you confirm that an electrical system has been secured in a zero state?

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Slide 19

REVIEW slide 19 and review the basic rules of using electrical cords and equipment.

APPLICATION FEEDBACK: now that we have discussed a little about safe practices, have the participants answer the following question.

ASK the participants to describe how to properly disconnect receptacle plugs.

Electrical Cords and Equipment How do you properly disconnect receptacle plugs?

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Emergency Response• If you see someone lying unconscious or "frozen on

the circuit," the very first thing to do is SHUT OFF THE POWER by opening the appropriate disconnect switch or circuit breaker.

• If the power disconnect switch cannot be located quickly enough, it may be possible to dislodge the victim from the circuit by prying them or hitting them away with a dry wooden board, a leather belt, or a safety vest.

20 Slide 20

Slide 21

REVIEW slides 20 and 21 and review the proper tactics for responding to emergencies.

ASK the participants to describe the proper protocol when confronted with an Unconscious shock victim and a Conscious shock victim.

Emergency Response List the proper protocol when confronted with the following situations.

Unconscious shock victim _______________________________________________

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Conscious shock victim

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Slide 22

REVIEW and summarize the module.

EVALUATION and CLOSURE: Recap the main points of the module before moving on to the next topic within this course.

ASK the participants if they have any outstanding questions regarding what was presented.

Summary

Documents

Instructor/Participant Guide - Transit Training · General Electrical Safety Procedures. Transit Elevator/Escalator Consortium. Electrocution • Electrocution is a fatality resulting