DuraLabel's Weekly Safety News

Blog Author Angelique Sanders

Weekly safety news. Stay in touch with regulations from OSHA, NFPA, and other safety codes. Find out about other companies' best and worst practices. We scour the internet to provide you with helpful training resources and the latest safety information.

Tuesday, March 29, 2011

Excellent Arc Flash article from Automation World Magazine

I thought this was one of the best arc flash articles I've ever read -- comprehensive and clear.

A Prescription for Personal Protection April 2011 (p.43) When most automation professionals think of safety standards, what usually come to mind are standards for designing and installing products and processes. Thoughts are normally of standards for putting safeguards on the equipment so that it not only operates safely, but also shields any nearby people from its dangers. Few ask about safeguards on the people. What about them? Are there any standards for safeguarding the people who work around automated equipment? Yes, as a matter of fact, there are.

An important one that has emerged over the last decade is the NFPA 70E Standard for Electrical Safety in the Workplace, developed by the National Fire Protection Association, in Quincy, Mass. This standard explains the risks associated with working on electrical equipment, and specifies protective gear for such hazards as shock, electrocution, arc flash and arc blast. Although hazards such as arc flash and arc blast have existed since electrical energy has been harnessed, these events were not defined clearly until quite recently, which made quantifying them difficult.

“There was an assumption that electricians knew all of the risks associated with what they were doing,” observes John Kay, manager of medium-voltage special applications and research and development at supplier Rockwell Automation Inc., in Cambridge, Ontario, Canada. Given the increasing complexity of automation, this is no longer a good assumption, if it ever was. Not only does NFPA 70E define exactly what those risks are, but it also describes how to calculate the amount of energy released during an arc event. The flash-hazard analysis in the standard determines both the flash protection boundary distance and the energy that could be released. NFPA supports the standard with help from the IEEE 1584 standard, the Guide for Performing Arc-Flash Hazard Calculations, from the Institute of Electrical and Electronics Engineers, in New York, and the less precise arc-flash estimator at http://bit.ly/1104_001.

Vendors such as Rockwell Automation also can provide services for determining the expected arc-flash energies throughout a facility. Armed with this information, employers can then outfit their employees with the appropriate personal protective equipment. The standard also makes use of the latest science on labeling to ensure that the necessary information is both noticed and comprehended by the people working around the equipment.

“Human beings tend to speed read and ignored much of texts on labels,” notes Kay. “So there has been a lot of science into what labels should include, and how they should look.” Upcoming revisions to NFPA 70E should clarify and amplify labeling requirements.

Canada has a similar standard called CSA-Z462, which mirrors NFPA 70E. Although no international standard addresses arc flash directly, the hazard is considered in IEC 6204, the electrical standard for machinery.


posted by jarubinger
View This Post - (1 Comments)


Anonymous steve @ electrical safety said...

Thanks for the repost. Good article.

Awareness of the dangers and safety concerns concerning electrical equipment breakdown, arc flash and arc blast.

The better the training, the more advanced the arc flash PPE, the more extensive the legislation and training, the better it will be for everyone in the industry.

6:56 AM  

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