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 – 25, 2024 July 10 – 11, 2024 2024 NFPA…
2024 NFPA 70E Update Jim Phillips, P.E. The 2024 Edition of NFPA 70E: Standard for Electrical Safety in the Workplace is scheduled to be published later this year. First released in 1979, this will mark the thirteenth edition. While some…
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…
2022 IEEE 1584.1 Just Published!: I’m happy to announce the latest Edition of IEEE 1584.1 “IEEE Guide for the Specification of Scope and Deliverable Requirements for an Arc-Flash Hazard Calculation Study in Accordance with IEEE Std 1584” was just published. The working group informally refers…
How to Perform an Arc Flash Study – Part 5 Incident Energy and Arc Flash Boundary Calculations: The final part of this series examines incident energy and arc flash boundary calculations for the 480V panelboard example used in this series. IEEE 1584—IEEE Guide for Performing Arc Flash Hazard Calculations defines incident energy as, “The amount of thermal…
The duration of an arc flash is typically defined by how long it takes an upstream overcurrent device to operate and clear the fault. This requires using the device’s time current characteristic (TCC), which is based on the specific device…
How to Perform an Arc Flash Study – Part 3
Arc Duration: Time is everything when an arc flash occurs. The longer the duration, the greater the incident energy exposure – which is directly proportional to the duration. The 2018 Edition of IEEE 1584 defines the arc duration , also referred to…
How to Perform an Arc Flash Study – Part 2
Arcing Fault Current: Arcing Fault Current – Effect of Gap, Voltage and Electrode Configuration An arc flash occurs when short circuit current jumps across an air gap between energized conductors. The event is normally the result of initial (and inadvertent) contact between energized…
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…
Warning! No Arc Flash Hazard Exists!: I’m sure that title raised a few eyebrows but before you send me an email telling me how I got this wrong, hang in there for the rest of the thought. I receive questions about this phrase on a pretty…
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