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Technical Articles

NFPA 70E

Working Distance Mistakes in an Arc Flash Study

May 29, 2012

The term “working distance” appears 20 times in the 2012 Edition of NFPA 70E, the Standard for Electrical Safety in the Workplace. It appears 12 more times in the annexes. The working distance is an important component of the arc flash hazard analysis and is frequently listed on arc flash warning labels and in the arc flash report. IEEE 1584—IEEE Guide for Performing Arc Flash Hazard Calculations 2002 defines the working distance as “the dimension between the possible arc point and the head

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FREE Download Arc Flash Hazard Calculation Guide

How to Perform an Arc Flash Study

March 1, 2012

How to Perform an Arc Flash Study: What started as a slow drip a decade ago has turned into something more like a tidal wave. I’m not talking about a leaky faucet or a failing dam; I am referring to arc flash studies. Years ago, only a…

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Setting up the electrical enclosure

Arc Flash Hazard Calculation Studies

February 26, 2012

In the earlier years of NFPA 70E and the emergence of arc flash protection requirements, many people would use the NFPA 70E Hazard/Risk Tables to determine what arc rated PPE to wear. This approach continues to shift towards the use…

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Arc Flash Training – Keeping Skills Current in a Down Economy

December 30, 2011

Electrical Power Training and Arc Flash Training remain even more important in a down economy. What if you had been stranded on a deserted island for the past five years? By the time you were rescued, you would have missed the explosion of social media usage, including Facebook, YouTube and Twitter, as well as advancements in smart grids and wind and solar energy—it would be more than you could imagine. You may think, “How could the industry have changed so

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IEEE 1584 – 125 kVA Transformer / Less than 240 Volts Exception

December 31, 2010

One sentence in the IEEE 1584 Standard, IEEE Guide for Performing Arc-Flash Hazard Calculations, frequently has people scratching their heads: Equipment below 240V need not be considered unless it involves at least one 125 kVA or larger low-impedance transformer in its immediate power supply. What does this sentence mean? What is so significant about 240 volts and 125 kilovolt-amperes? Download:  125 kVA / 240 Volt Exception       About Jim Phillips: Electrical Power and Arc Flash Training Programs –

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Complete Guide to Arc Flash Hazard Calculation Studies

How to Perform an Arc Flash Calculation Study

October 12, 2010

This article by Jim Phillips provides an overview of how to perform an arc flash study. It was originally presented at the 2010 NETA Conference. InterNational Electrical Testing Association. BUY NOW Arc Flash Calculation Study Many separate codes, standards and…

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DC Arc Flash Hazard Calculation Guide - Free Download

Arc Flash Boundary and Working Distance

February 14, 2010

Greater Distance = Greater Arc Flash Safety When a bomb goes off, the further you are from the explosion, the safer you will be. This same concept also applies if an arc flash incident occurs. Whether you are a properly…

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How Did We Get Here? The History of Electrical Safety

July 28, 2009

It seems like the more you attempt to learn about arc flash and electrical safety, the more confusing it becomes. A mixture of letters such as OSHA, NFPA 70E, NEC, IEEE 1584, ASTM F1506 seem to be the secret language used by the electrical safety industry. Who created this alphabet soup of standards, and how did we get here?

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