2024 NFPA 70E: Major Changes

2024 NFPA 70E Updates by Jim Phillips and Brainfiler. Learn about the new changes to this very important electrical safety standard.

Jim Phillips, P.E. 2024 NFPA 70E Changes and Refresher Training Register for Jim Phillips’ 8 Hour 2024 NFPA 70E  Changes and Refresher Training! February 13 – 14, 2024 April 24 – […]

Arc Flash Study Top 10 FAQs Part #3

How Does Everyone Else Do This? By Jim Phillips 3-Part Series ARC FLASH LABELS What do you list on an arc flash label when 
the prospective incident energy is greater […]

Arc Flash Study Top 10 FAQs Part #1

How Does Everyone Else Do This? By Jim Phillips 3-Part Series   There are many frequently asked questions about performing an arc flash study (risk assessment) and understanding electrical safety […]

Include Date on Arc Flash Label?

According to the 2015 Edition of NFPA 70E 130.5(2), The arc flash risk assessment “…shall be reviewed periodically, at intervals not to exceed 5 years, to account for changes in […]

2015 NFPA 70E Changes

The following is an article that I wrote a few years ago listing the major changes for the 2015 edition. It was originally published in the May 2014 issue of Electrical […]

Arc Flash Labels-PPE Category

In the NFPA 70E-2015 Handbook, page 122, 130.5(D) states incident energy or PPE category shall be on the equipment arc flash label, but not both. Yet when reviewing Annex H […]

Work on an energized disconnect

Recently, a client asked if there was something I could point to in the NFPA 70E Standard that specifically prevented a qualified electrician from working on a disconnect after it […]

Lock Out / Tag Out Simple vs. Complex

OSHA and NFPA 70E refer to a Simple LOTO as involving only one person/conductors/circuit part(s). A Complex LOTO is when there are conditions such as more than one person/circuit/shift/source involved […]

AF Boundary Marking

Hi, As per NFPA 70E, we have 3 boundaries to mark(AFB, limited and restricted). It is easy to mark and follow only one boundary which is greater than two. Sometimes […]

Arc flash detection relay

What is the practice for the use of arc detection relay trip time in the arc incident energy calculations? NFPA-70E recognized arc detection relay but kept under “Other Methods” as […]


AS I understand it in NFPA 70 E 130.7 table any Panel 240 volts and below require Category 1 PPE. Also NFPA says any voltage 120 volts Phase to Phase […]

NFPA 70E and Improved Electrical Maintenance

The duration of an arc flash can be greatly affected by the condition of electrical protective devices – i.e. circuit breakers, relays etc. NFPA 70E has been placing an increased […]

2015 NFPA 70E – 10 Item Check Up

2021 NFPA 70E Training Brainfiller.com

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. […]

NFPA 70E – Qualified Workers

2021 NFPA 70E

“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 […]

Working Distance Mistakes in an Arc Flash Study

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 […]

Arc Flash Hazard Calculation Studies

Setting up the electrical enclosure

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 […]

Arc Blast and 40 calories/centimeter squared

You look at the arc flash warning label and scratch your head. Danger! No PPE Category Found. No personal protective equipment (PPE) category? Now what? This type of language is […]

Coordination and NEC 240.87

NEC 240.87 has addressed a potentially hazardous situation beginning with the 2011 edition. When selective coordination is critical, e.g., minimizing the extent of an outage, a common design practice is to use […]

How to Perform an Arc Flash Calculation Study

Complete Guide to Arc Flash Hazard Calculation Studies

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. Arc […]