DuPont™ Arc Guide An Integrated Methodology to Mitigating Electric Arc Hazards

Agenda

1. Introduction 2. Arc Hazard Risk Methodology - Predict - Prevent - Protect - Publish 3. Wrap-up and closure

2

Predict Prevent

Protect Publish

DuPont Safety Culture – History

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Belief that all injuries are preventable developed in the 1940s.

Safety statistics began in 1912.

First safety rules established in 1811. “Safety is a line management responsibility. … No employee may enter a new or rebuilt mill until a member of top management has personally operated it.” – E. I. du Pont

Powder mill operation began in 1802.

Off-the-job safety program began in the 1950s.

“Goal is Zero” established in 1990s.

Safety has become part of our DNA

1800 1850 1900 1950 2000

DuPont Aims to Help Safety Managers with the Challenges Faced by Electric Arc

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INDUSTRY CHALLENGES...

• Assess Hazard severity • Comply with EU Directives • Implementation of risk reduction & protection measures • Selection of Appropriate PPE for residual risks

DuPont Engineering Research & Technology

DuPont Protection Technologies-

Makers of Nomex®

Expert External

Consultants

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•Residual risk •Optimum

solutions

• Information •Training • Labelling

•Risk Reduction

•Hierarchy of risk controls

•Calculate •Validate

Predict Prevent

Protect Publish

Publish Results & Training

Re-evaluate

Can we apply further

prevention techniques?

Apply Protection Measures

Results Predict Severity

Residual Risk

START

YES

NO

Our Methodology for Approaching Arc Risk Hazards

Agenda

1. Introduction 2. Arc Hazard Risk Methodology - Predict - Prevent - Protect - Publish 3. Wrap-up and closure

6

Predict Prevent

Protect Publish

How do we measure the extent of the hazard? Calculate the „Incident Energy“, which defines the severity of the arc flash at a certain distance

Measured in kJ/m2, J/cm2, or cal/cm2 1.2 cal/cm2 applied to skin for 1 second: the threshold for the onset of second degree burns

Governs the arc flash boundary

-Based on 1584-2002 IEEE Guide for Performing Arc Flash Hazard Calculations-

Arc Flash Hazard Assessment

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What affects Arc Energy Level?

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AMOUNT OF CURRENT

DURATION OF CURRENT

Panel to be worked upon Fault Level in kA?

Protective device type or characteristic?

11kV

400V

Transformer

Utility or HV Supply

1 2 3 4

Based on:

Equipment type Working distance

Incident Energy Exposure Level

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Working Distance

“The boundary within

which a person could receive a second degree burn from an arc flash incident.“

Definition IEEE1584

Flash Protection Boundary

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Flash Protection Boundary

Effect of distance on Incident Energy

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Online DuPont™ Arc-Guide

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Sample Calculation Typical European Medium-sized manufacturing company

Full calculation

14 Projection

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Full calculation

Projection

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Full calculation

17

Full calculation

Select the number of wires in the cable. Choose between copper and aluminum cables Choose the cross-section of the cable Select the number of parallel cables. Enter the cable length.

Full Calculation

18 Projection

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Progose

Full calculation

Projection

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Full calculation

Projection

Calculation

21 Projection

Calculation

22 Projection

Full calculation

23 Prevention

24 Prevention

First Calculation:

Second Calculation: Replacement of NH fuse by ultra-rapid fuse

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Human Factors

The importance of Human Factors Awareness of the hazard Training and competence assessment Electrical duty holder/champion

Processes

Written procedures Based upon risk assessment Clearly defined, written instructions Clear responsibilities Contractor competence

Prevent: Risk Elimination – Safe Systems of work

Prevent

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Residual risk after all mitigation measures in place Personal protective equipment The European legislative framework Body protection Layering Everyday workwear Additional protection Hand face and eye

Protecting against residual risk

Jacket

Arc Rating Body Protection ATPV > 4 cal/cm2 Box Test Class 1

ATPV > 8 cal/cm2 Box Test Class 1

ATPV > 12 cal/cm2 Box Test Class 1

ATPV > 25 cal/cm2 Box Test Class 2

ATPV > 40 cal/cm2 Box Test Class 2 27

Ensuring Fit-for Purpose Garments for Your Situation

Long Sleeved Business Shirt

Long Sleeved Polo Shirt Trousers Coverall Coat

Weather Jacket & Trouser

Layering with solutions made from NOMEX® fabrics

Possible Nomex® multi-layer systems include • Underwear • Shirts/jackets/trousers/coveralls • Polo Shirts • Sweatshirts • Multi-layer jackets and trousers • High Visibility • Foul weather gear • Multi- layer systems for short duration wear for high level incident energy risks

Lightweight comfortable layering offering relevant level of protection Ensure worker is not restricted from cumbersome clothing

Source: J & K Ross

Source: Centurion

Source: Dehn Source:J + K Ross

Hand Protection Eye/Face/Head Protection

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Risk Assessment Report Forms Training Labelling of switchgear and Control Panels

Publishing of results

Publish Results & Training

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Publishing of results

Agenda

1. Introduction 2. Arc Hazard Risk Methodology - Predict - Prevent - Protect - Publish 3. Wrap-up and closure

31

Predict Prevent

Protect Publish

www.arcguide.dupont.com

Public website Full application & services

Risk Assessment: •Predict

•Prevent

•Protect

•Publish

Access to experts

For Additional Info: