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Arc Flash Protection:
Wiha Insulated Wrenches
Description Page
Wiha Insulated tools can be a vital component in your Arc Flash
protection strategy. What is Arc Flash?
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ARC FLASH
An Arc Flash is an electrical explosion due to a fault condition or short Insulated Ratchet Wrenches 5
circuit when either a phase to ground or phase to phase conductor is
connected. Arc flashes cause electrical equipment to explode, resulting
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in an arc-plasma fireball. Temperatures may exceed 35,000 F (the
surface of the sun is 9000 F). These high temperatures cause rapid
heating of surrounding air and extreme pressures, resulting in an arc
blast. The arc blast will likely vaporize all solid copper conductors which
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will expand up to 67,000 times its original volume when it is vaporized.
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The result of this violent event is usually destruction of the equipment
involved, fire, and severe injury or death to any nearby people.
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WHY ARC FLASHES HAPPEN
8.0, 10.0, 12.0, 15.0
There are a variety of reasons why an Arc Flash can occur, but most
of them are preventable. Most arc flashes occur when maintenance
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workers are manipulating live equipment for testing or repair and
accidentally cause a fault. Improper tools, improper electrical
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equipment, corrosion of equipment, improper work techniques and lack
of training are just some of the events that can lead to a devastating
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arc flash or arc blast.
ARC FLASH COMPLIANCE
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There are 4 main regulations that govern electrical safety & arc flash:
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1. OSHA Standards 29CFR, Part 1910. Occupational Safety and
Health Standards. 1910 sub part S (electrical) Standard number
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1910.333 specifically addresses Standards for Work Practices and
references NFPA 70E. OSHA 29CFR 1910.335 (a) (1)(i) requires the
use of protective equipment when working where a potential electrical
hazard exists and 29CFR 1910.132(d)(1) which requires the employer
assess the workplace for hazards and the need for personal protective Wiha Insulated 3/8 Hex Drive Bit Sockets
equipment. OSHA compliance is required by any plant building or facility.
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2. The National Fire Protection Association (NFPA) Standard 70 -
2002 The National Electrical Code (NEC) contains requirements for
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warning labels.
3. NFPA 70E provides guidance on implementing appropriate work
practices that are required to safeguard workers from injury while
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working on or near exposed electrical conductors or circuit parts that
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could become energized. Part II 2-1.3.3 regarding Arc Flash Analysis
states that a Flash Hazard Analysis shall be done before a person
approaches any exposed electrical conductor or circuit part that has
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not been placed in an electrical safe work condition. This Arc Flash
Hazard Analysis must be done to determine the level of Personal
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Protection Equipment PPE that a worker must use, and the Arc Flash
Boundary in inches along with the incident energy found at each
location. Each panel must be marked with an ANSI z535 approved Arc
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Flash Warning Label.
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4. The Institute of Electronics and Electrical Engineers (IEEE) 1584
2002 Guide to Performing Arc-Flash Hazard Calculations
copyright information by: American Trainco, Inc.
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