NFPA 70E 110.3(J) Incident Investigations Electrical power systems, like all complex systems, are prone to failures. These failures can arise from a wide range of causes, including improper work procedures, faulty or inadequately maintained equipment, or human error, among others.
Electrical Design and CYA – “Suspected” Electrical Fire Fire Scene Examination Report I’m sure you have heard the acronym CYA before. Cover your…. I mentioned CYA quite a bit in my 32-hour Power System Engineering class. We discuss many design…
Safety by Design: A Technique That Incorporates Hazard Analysis and Risk Assessment Most electrical power systems are considered “legacy” systems, meaning they are older and may not utilize the latest technologies. In contrast, newer systems often adopt a design strategy…
Electric Current through Tissue and Air Shock and Arc Flash Hazards Figure 1: Absence of voltage tester | Panduit Corp. Basic electrical theory is that the greater the load is, the greater the current. Normally, the current flows through conductors…
How to Perform an Arc Flash Study – Part 1
Based on the Latest Edition of IEEE 1584: What is an arc flash study sometimes known as an arc flash assessment? Performing an arc flash analysis can be complex enough but the latest edition of IEEE 1584 – IEEE Guide for Performing Arc-Flash Hazard Calculations has taken it…
Jim Phillips, P.E. Every three years I have the privilege of writing the NFPA 70E Changes article for National Electrical Contractor Association’s magazine: Electrical Contractor . The NFPA 70E 2021 edition of this standard will be available September 4, 2020…
2021 NFPA 70E – Major Changes By Jim Phillips The 2021 Edition of NFPA 70E is right around the corner and with it – many changes. Every three years I have the privilege of writing about the upcoming changes for…
Rocket Sled that Inspired “Murphy’s Law” OK, not the most professional sounding title for an article about electrical safety. But play along, you will be able to connect the dots rather quickly. Captain Murphy Around seventy years ago, Captain Murphy…
Plasma – Modify the Arc Rating or Modify the Incident Energy Calculations? I am frequently asked questions about the application of the 2018 edition of IEEE 1584 – especially electrode configurations and more specifically, about HCB (Horizontal Conductors/Electrodes inside a…
Case Study – Arc Flash While Switching – Normal Operation?: A common question that I often hear in my NFPA 70E and IEEE 1584 Arc Flash Studies training courses is: “Can simply operating a device such as a fusible switch or circuit breaker cause an arc flash?” I respond to…
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