Making Sense of the Numbers Utility Company Short-circuit Data For Arc Flash Studies Electrical Contractor Magazine – November 2012 Jim Phillips, P.E. One of the first steps in performing an arc flash hazard calculation study is to request the short-circuit…
Many safety labels use either Caution, Warning or Danger with a specific color associated with it. The U.S. National Electrical Code and NFPA 70E both reference ANSI Z535 to provide guidance regarding effective words, colors and symbols for signs and…
2018 NFPA 70E – 40 cal/cm2 Threshold (may be) Deleted: Finally! The 40 cal/cm2 threshold my finally be deleted. The For many years, the 40 cal/cm2 threshold that is part of Informational Note 3 presently found in the 2015 Edition of NFPA 70E Section 130.7(A) has been the subject of…
Webinar – Utility Short Circuit Current Data, Arc Flash Studies and Change by Jim Phillips, P.E. It goes up, it goes down, sometimes it is thought to be infinite (although it really isn’t!) and other times it seems impossible to…
With the 2015 Edition of NFPA 70E being published and all of the changes that it brings, it is time to review your arc flash study, labels and overall practices. There are many key areas that should be evaluated. Here…
Specifying Arc Flash Studies and IEEE 1584.1: An arc flash study can be a bit complicated if you are new to this field. Knowing where to begin, what to include, how far to go, how to use the software etc. can seem like an insurmountable undertaking. WORSE…
NFPA 70E – Qualified Workers: “Raise your right hand” Pretty intimidating words – especially if they are said in a court room and the trial is about an injury or death. – and you are on the wrong side of what happened. Let’s face it…
NFPA 70E – Standard for Electrical Safety in the Workplace, was first published in 1979 and consisted of only one part, The 2015 Edition marks the tenth edition to NFPA 70E and with it, many sweeping changes. This article provides…
The surface area of the earth is approximately 197 million square miles, and IEEE 1584—IEEE Guide for Performing Arc-Flash Hazard Calculations has been covering more of it every day since it was first published almost 11 years ago. Although the IEEE 1584 standard has its roots in the United States, it has gained widespread international use as the most common method for performing arc flash calculation studies.
IEEE 1584 – Where It All Began – 2002 A lot has happened since 2002 when IEEE 1584 – IEEE Guide for Arc-Flash Hazard Calculations was first published. The development of this land mark document included conducting over 300 arc flash tests which were used to create the empirically derived equations. Applicable for three phase calculations and voltages ranging from 208 volts to 15,000 volts, four main calculation methods are the backbone of this standard and include: • Arcing short
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