Arc flash assessment, hazard study and short circuit fault current calculation  
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NFPA 70E describes arc flash analysis as a study that investigates a worker's potential exposure to arc flash energy, conducted for the purpose of injury prevention and the determination of safe work practices and the appropriate levels of PPE. A flash hazard analysis determines two important things: the flash protection boundary distance and the possible arc flash incident energy.
The calculations are based on tests in a cubic box (20 inches on each side, opened on one end), 208 up to 600V systems with an electrode gap of 32 mm., available bolted short-circuit currents of bw. 16 to 50kA. Consult IEEE 1584 for other than these fault conditions.

 I read the Notes and agree to be bound by all terms and conditions on that page.

IEEE 1584 and NFPA 70E based Arc-Flash-Analytic v 3.2 tool for arc flash hazard analysis ( PC version for Windows 9X, 2000, NT, XP, ME, Vista) has been released.

Arc Flash Analytic v3.2 Presentation ( 96 sec. duration).
Also available in high definition WMV format ( 6M )
Learn more about A-F-A v3.2

BONUS - Free Short Circuit Software included

  • build comprehensive one-line diagrams
  • save a system and open a previously saved system
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  • calculate minimum and maximum available short-circuit currents.

Purchase Arc Flash Analytic v3.2 software on CD or electronically and get one month use of the ArcAd Online Short Circuit Calculator for free

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  • Calculator-style interface makes complex calculations easy to understand.
  • Provide a safer working environment by specifying the proper level of PPE. Wearing inadequate clothing is dangerous for obvious reasons, but wearing too much clothing is dangerous due to limited mobility and visibility.
  • Design safer power systems while insuring compliance with NEC 110.16, OSHA, NFPA 70E and IEEE 1584 standards.
  • Avoid potential fines, lost productivity, and increased insurance and litigation costs.
  • Save time by generating arc flash warning labels in electronic .JPG and .BMP formats
  • Customize labels by selecting and adding information displayed on them.
  • Save results in generic text format for future reference or printing with one button click.
  • Perform analysis using metric (mm, Joules ), imperial units (inches, calories ), or even a mix of both
  • Calculate arc blast explosion pressure and arc TNT equivalent
  • Create warning labels in English, French or Spanish

arc blast, arc flash analysis

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Clearing time for the range of 0.004 sec to 2 seconds is to be entered into this box. The clearing time for a current limiting fuse is approximately 1/4 cycle or 0.004 seconds. The clearing time of a circuit breaker is approximately 0.1 seconds or 6 cycles. This can be broken as follows: actual breaker time (approximately 2 cycles), plus relay operating time of approximately 2 cycles, plus an additional safety margin of 2 cycles, giving a total time of 6 cycles.


Available 3 phase bolted fault current for the range of 16kA to 50kA at the point where work is to be performed is entered into this box in kA. Example: if 42,357 amps are available, enter 42.357 into this box. If 16,000 amps are available, enter 16 into this box.


System Line to Line Voltage for the range of 208V to 600V is entered into the box in Volts.


Flash protection boundary: An approach limit at a distance from exposed live parts within which a person could receive a second-degree burn if an electrical arc flash were to occur. (per NFPA 70E) Flame resistant personal protection equipment (PPE) must be worn by anyone within the flash protection boundary.


The amount of energy impressed on a surface, a certain distance from the source, generated during an electrical arc event. (per NFPA 70E). This energy is generally expressed in calories/cm2. The surface of concern impressed on is the worker's body, particularly the head and trunk. Incident energy is calculated using variables such as available fault current, system voltage, expected arcing fault duration and the worker's distance from the arc. The data obtained from the calculations is used to select the appropriate flame resistant (FR) PPE, just as voltage level is used to select a class of rubber gloves.


This is used to determine the minimum rating of Personal Protective Equipment in calories per centimeter squared, with the intent to protect the worker from the thermal effects of the arc flash at 18 inches from the source of the arc. Review the Notes for Arc Flash Calculator for a more detailed explanation.
Min Incident Energy, cal/cm^2 Max Incident Energy, cal/cm^2 Risk Category Required Min Rating of PPE, cal/cm^2
0 1.2 0  
1.2001 4 1 4
4.001 8 2 8
8.001 25 3 25
25.001 40 4 40
40.001 and above Not Available N/A

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