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 – […]

Electrode Configuration and 2018 IEEE 1584

Electrode Configuration and 2018 IEEE 1584

The most frequently asked question that I receive regarding the 2018 edition of IEEE 1584 is: “How do I determine the electrode configuration?”  The 2002 edition was based on arc […]

IEC 61482-2 Second Edition Just Released!

IEC 61057 International Standard

As the International Chair of IEC TC78 Live Working Committee, I am excited to announce the recent publication of the second edition of IEC Standard 61482-2 Live working – Protective […]

IEEE 1584 Status Update

IEEE 1584 under construction

I have been receiving many questions lately about the status of the next edition of the standard: IEEE 1584 – IEEE Guide for Arc-Flash Hazard Calculations.  As Vice-Chair of the […]

Keeping Skills Current with FREE Training

Published: May 2017 By Jim Phillips Part 2 of 2 Part Series There is an endless list of reasons for keeping your skills and knowledge up-to-date in the electrical industry. These days […]

Keeping Skills Current on a Limited Budget

2-Part Series Published: May 2017 By Jim Phillips Part #1 of a 2 Part Series: What if you had been stranded on a deserted island for the past five years? By the […]

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 […]

How Many Arc Flash Labels on Equipment?

Question of the Week Some equipment may have multiple arc flash labels for a variety of reasons. Different operating configurations Equipment is long/large – including busway Equipment has different incident […]

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 […]

Reducing Arc Flash I/E At Fire Pump Controllers

Question: What are you guys recommending to reduce incident energy levels on fire pump controllers fed directly from the secondary side of utility transformers? Answer: Can’t be done. This is a […]

120 Volt Arc Flash

I believe it to physically impossible to sustain an arc flash at 120 V but can someone point me to the proof? Can someone indicate where a code specifically states […]

Arc Flash Label Updating – How Many Times?

NFPA 70E requires that an Arc Flash Risk Assessment be updated when a major modification or renovation takes place. It shall be reviewed periodically, at intervals not to exceed 5 […]

Maximum Short Circuit Current

The intensity of an arc flash is dependent on the magnitude of short circuit current. Lower voltage systems (less than 600 volts) tend to have the highest short circuit currents. […]

Using gloves with a stick

1910.269 requires arc flash protection for hands with exceptions when wearing leather protectors over rubber gloves, and when wearing heavy duty work gloves. The workers state that sticks should be […]

DC Arc Flash Boundary

Could i use the (DB) empirically derived model equation of IEEE Std 1584-2002 to calculate the Flash-protection boundary (for box configurations) and the Lee (DB) equation (for open air configurations)? […]

RELT or ARM Arc Flash Labels

It always seems as if we are kicking the dead horse on arc flash labels but I was just interested in your opinion of how to label a piece of […]

Replacing AF Labels

I will be updating arc flash labels on numerous working locations which means the old label has to be removed and a new one applied. By design these labels are […]

Falsified Arc Flash Study

As a electrical engineer who performs arc flash studies and investigates electrical accidents I have come across a company who is faking their arc flash studies. They go into companies […]

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 […]

Arc Flash Shields in disconnect boxes

I repair UL listed appliances that are sometimes directly wired into a fused or unfused disconnect box if they exceed 50A. Sometimes I need to test the voltage on both […]

Harmonic Correction Unit?

Harmonic Correction Unit? Would a Harmonic Correction Unit impact the incident energy during an arc flash in an MCC line-up? READ ANSWER

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 […]

Global Use of IEEE 1584

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 […]

IEEE 1584 Revision Update – 201X Edition

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 […]

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 […]

Predicting the Arc Flash Duration

Determining the arc flash duration is the most important piece of information in predicting its severity. The arc flash duration is usually dependent on how fast an upstream protective device will […]

Arc Flash – Unplugged

Arc Flash – Dynamite, gasoline, gunpowder and electricity: What do these have in common? Each one can explode. Something as simple as the slip of a screwdriver can cause the […]