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NFPA 70E

Short Circuit Calculations and Conduit Material

July 29, 2016

I recently came across a previous study that was completed for a facility that assumed a specific type of conduit [non-metallic/magnetic; PVC] vs what was actually installed [Rigid Meal Conduit], in digging into this deeper and looking at some of the short circuit calculations information available to me it appears that in the calculation they type of conduit [magnetic vs non-magnetic] can play a role in the amount of available fault current. When doing some quick simplistic calculations it appears

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Normalized incident energy explained?

July 29, 2016

Can someone explain incident energy normalized, what is it and how it is obtained .Utilizing the Incident Energy at Working Distance -Empirically Derived Equation -NFPA 70E-D4.3, En = incident energy normalized. E= 4.184* Cf * En (t/0.2) (610/D) ^x Thanks. READ ANSWER

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2018 NFPA 70E - 40 cal/cm2 Threshold (may be) Deleted

2018 NFPA 70E – 40 cal/cm2 Threshold (may be) Deleted

January 10, 2016

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…

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2021 NFPA 70E Training Brainfiller.com

2015 NFPA 70E – 10 Item Check Up

April 4, 2015

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…

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2021 NFPA 70E

NFPA 70E – Qualified Workers

October 16, 2014

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…

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IEEE 1584 Revision Update – 201X Edition

August 30, 2013

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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Warning Label - Arc Flash Shock Hazard Appropriate PPE Required

Arc Flash Labels – Simplified!

August 6, 2013

“What do you mean we need to relabel the electrical equipment? Didn’t we just do this a few years ago?” This is a pretty common response when addressing the requirements of NFPA 70E 130.5(2), which necessitate that the arc-flash risk…

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Wind and Solar Electrical Safety

May 31, 2012

Wind and Solar Electrical Safety – Rising to the Occasion – A few months ago I was driving home from the Los Angeles area and suddenly found myself surrounded by thousands of wind turbines lining both sides of Interstate 10. Even though I have made this trip many times before, I am still in awe at the scale of it all. Looking through my

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