protecting against residual risk - dupont‘s “4 p“ approach
TRANSCRIPT
Electrical Arc Flash:
ProtectingProtecting against residual risk - DuPont‘s “4 P“ Approach
Elaina Harvey - Electric Arc End User Specialist - Nomex®
The DuPont Oval, DuPont™, The miracles of science™, Nomex® and ArcMan® are registered trademarks or trademarks of DuPont or its affiliates
Alsico AcademyA plus A
Predict Prevent
ProtectPublishPublish
Results & Training
Re-evaluate
Can we apply further
prevention techniques?
Apply ProtectionMeasures
ResultsPredictSeverity
Residual Risk
START
YES
NO
DuPont’s Methodology for Approaching Arc Risk Hazards
What is an Electric Arc?
PlasmaMolten MetalPressure WavesSound WavesShrapnelHot Air-Rapid ExpansionIntense UV Light and Infra Red RadiationCopper Vapor:Solid to Vapor ExpandsRadiant and Convective Heat 20’000 °C. (Temp on surfaces only a few hundred oC)
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Usually an inadvertent contact between an energised conductor with another conductor or an earthed surface.
Possible causes of electrical arcs:• Accidental contact with energized parts • Contamination (e.g. dust) on insulating
surfaces• Wiring errors• Corrosion of equipment parts and contacts • Improper work procedures Arc flash Incident
Two different ways of testing Protective Clothing & Materials
Determination of the Thermal effects of an Electric Arc on PPE
Determination of theIncident Energy
Simulation of definedscenarios
EN / IEC 61482-1-1
(Open Arc Test)EN / IEC 61482-1-2
(Box Test)
Thermal Resistance:Arc Thermal Performance Value (ATPV) or
Breakopen Threshold Energy (EBT50)
Arc Protection Classes:Class 1 (4kA) Class 2 (7kA)
Pass/Fail
IEC 61482-2 (Draft EN 61482-2)Requirements for Material Performance & Garment Design,
Marking & User Information
(Value is > Prospective Incident Energy identified during risk assessment)
Protect
DuPontTM Arc-Man®
in accordance to
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
Ensuring Fit-for Purpose Garments for Your Situation
Long Sleeved Business Shirt
Long Sleeved Polo Shirt
Trousers Coverall Coat
OPTI
ONAL
OPTI
ONAL
Weather Jacket & Trouser
* In Europe there are not ATPV category classes like there is in the USA according to NFPA 70
• Using Nomex® provides lightweight comfortable layering to the relevant level of protection
• Ensures worker is not restricted from cumbersome clothing
4 to > 40 cal/cm2 / Class 1 & Class 2 systems available
Examples In DuPont’s Thermal Industrial Guide
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Wish To Find Out More Information?
• www.arcguide.dupont.com
• www.nomex.co.uk/solutions
• Ask an Alisco Specialist
• Visit the DuPont Stand Hall 5 A40
• [email protected]+44 7881 836588
This information corresponds to our current knowledge on the subject and may be subject to revision as new knowledge becomes available. It is your responsibility to investigate other sources of information on this issue that more appropriately addresses your product and its intended use. DuPont makes no warranties and accepts no liability whatsoever. This information is not intended for use by you or others in advertising, promotion, publication or any other commercial use.
Disclaimer Notice
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