Calculate incident energy of arc flash - NFPA 70E

Example shows how to use NFPA 70E annex D.4.3 to calculate the incident energy in cal/cm^2 of an arc flash incident on systems 208V through 15,000V. Formula works for all fuses and circuit breakers. Using the calculated incident energy one can determine the appropriate level of PPE for the potential arc flash hazard.

[cliffharrington]

Thankyou Jonathan, the clearest explanation I have seen yet.

[Railandi]

Thank you by the explanation. My best regards from Brazil.

[VikashKumar-tkde]

Very nice video by Mr.Gracey, Could you please make video on Arc flash Boundary calculation

[MrBelal]

Thanks Jonathan, jus one comment regarding the K1 factor value is (-0.555)

[hellygondalia]

Hi Jonathan, Can you please clarify how you take D = 455 mm.

[aremu]

Hi Jonathan, thank you for the clear explanation of the concept. In the calculation of your Normalized Incident Energy Level, the K_1 value used was a positive value (0.555), what would be the reason the value was positive in the equation? Thank you.

[Bravo_L]

are these tables and values only found in that expensive nfpa book? i cant seem to find that exact table you used online