290 MW PV Installation in SW Arizona When the 2018 Edition of IEEE 1584 was published last year, one subject was conspicuously absent – DC arc flash. DC power systems are everywhere and include sources such as rectifiers, photo-voltaic installation,…
Ever since the 2018 Edition of IEEE 1584 – IEEE Guide for Performing Arc-Flash Hazard Calculations was published a few months ago, people continue to sift through the many changes that have occurred. One of the more significant changes is…
Arc Flash, Second Degree Burns (My Wife and a Chili Cookoff): Yes, you read the title correctly – Second degree burns, my wife and a chili cookoff! And it all took place at home. But, before I get into that story, let me back up a bit. Standards such as NFPA…
Effective Training Presentations – A Few Tips From Jim’s 35+ Years Of Experience.: For many, it is nightmare scenario. Your department manager just came by and asked you to prepare and present a short training program for a client. It doesn’t matter if it is about Electrical Safety, Arc Flash, the latest National…
Zero-Sequence Impedance and Incident Energy: A question that I am often asked either on-line or in one of my arc flash training classes is in regards to incident energy calculations and line-ground short circuit current: “Since it is possible for the line-to-ground short circuit current…
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 IEEE 1584 working group, I would like to provide an…
When the topic of incident energy above 40 calories per square centimeter (cal/cm^2) comes up, the discussion can be quite interesting. People will sometimes refer to the high values in terms of a bomb or some other sensationalized description. Although…
Short Circuit Calculations – Transformer and Source Impedance An infinite bus transformer short circuit calculation can be used to determine the maximum short circuit current on the secondary side of a transformer circuit using only transformer nameplate data. This is…
Global Use of IEEE 1584: IEEE 1584 – It’s a Small World The world’s electrical systems do not discriminate when it comes to electrical safety. Electric shock, electrocution and arc flash hazards can occur anywhere on the planet that has electricity. An interesting side note…
New Exception 130.5(H) Exception No. 2 – Arc Flash Hazard Label Information May Not Be Required. It is amazing how the requirements for arc flash labeling have evolved with each new edition of NFPA 70E. Known as Arc Flash Warning…
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