Utility Short Circuit Data – Different Formats
National Electrical Code 110.9 Interrupting Ratings states that: Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the current that […]
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 […]
New to Arc Flash, Short Circuit and Coordination studies
Hi. I currently work as an Engineer in the energy management field. I would like to branch off in to doing Arc Flash, Short Circuit and Coordination Studies. How would […]
Harmonic Correction Unit?
Would a Harmonic Correction Unit impact the incident energy during an arc flash in an MCC line-up? READ ANSWER
2015 NFPA 70E – 10 Item Check Up
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. […]
Specifying Arc Flash Studies and IEEE 1584.1
An arc flash study can be a bit complicated if you are new to this field. Knowing where to begin, what to include, how far to go, how to use […]
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 […]
NFPA 70E Major Updates for the 2012 Edition – Part 2.
Although beginning with an erratic schedule with revisions to NFPA 70E being spaced anywhere from 2 to 5 years apart, this very important electrical safety standard is now on a […]
Using Correct Electric Utility Data for an Arc Flash Study
One of the first steps in performing an arc flash calculation study is to request short-circuit data from the electric utility company. This kind of request is pretty routine, and […]
IEEE 1584 – 125 kVA Transformer / Less than 240 Volts Exception
One sentence in the IEEE 1584 Standard, IEEE Guide for Performing Arc-Flash Hazard Calculations, frequently has people scratching their heads: Equipment below 240V need not be considered unless it involves […]
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 […]
