Arc Flash Study Top 10 FAQs Part #2

How Does Everyone Else Do This?

By Jim Phillips

3-Part Series



  1. Does your company or client permit energized work where the incident energy is greater than 40 calories per centimeter squared (cal/cm2)?

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Non Specific incident energy

I have started working at a manufacturing plant where the past practice is to put <1.2 cal on their arc flash labels. The thought being that any run less than several hundred feet fed from bus duct with LPS-RK1 fuses will be less than 1.2 cals. This turns out to be true based on my calculations. Even with the maximum motor contributions the calculations hold. Does anyone consider this to be in compliance with 70E? Does anyone else do this? READ ANSWER