Product/Hazard Arc Flash Calculator

Heat Flux/Arc Flash Calculator

There are several ways to determine the incident energy of your arc flash exposure:

  • Heat Flux Calculator where you can input the parameters of your electrical service to arrive at a result.
  • NFPA 70E-2012 Table 130.7(C)(15)(a) - “Hazard/Risk Category Classifications, AC Equipment” - Lists Hazard/Risk Category and recommended shock hazard PPE (rubber insulating gloves and insulating and insulted hand tools) for example tasks. Be aware of the important notes included after the table. NFPA 70E-2012 Table 130.7(C)(16) lists arc rated protective clothing and equipment for each Hazard/Risk Category level.
  • NFPA 70E-2012 Table 130.7(C)(15)(b) - “Hazard/Risk Category Classifications, DC Equipment” - Lists Hazard/Risk Category and recommended shock hazard PPE (rubber insulating gloves and insulating and insulted hand tools) for example tasks. Be aware of the important notes included after the table. NFPA 70E-2012 Table 130.7(C)(16) lists arc rated protective clothing and equipment for each Hazard/Risk Category level.
  • NFPA 70E-2012 Annex H “Guidance on Selection of Protective Clothing and Other Personal Protective Equipment”
  • CSA Z462-12 Table 4A “Hazard/Risk Category Classifications, AC Equipment” - Lists recommended shock hazard PPE (rubber insulating gloves and insulating and insulted hand tools) for example tasks. Be aware of the important notes included after the table
  • CSA Z462-12 Table 4B “Hazard/Risk Category Classifications, DC Equipment” - Lists recommended shock hazard PPE (rubber insulating gloves and insulating and insulted hand tools) for example tasks. Be aware of the important notes included after the table
  • CSA Z462-12 Annex H - “Guidance on Selection of Protective Clothing and Other Personal Protective Equipment”
  • IEEE 1584 “Guide for performing arc flash hazard calculations”
  • ARCPRO Arc Analysis Software and SKM's ARCCalc and Arc Flash Evaluation Software
  • Consultants and Electrical Engineers to conduct electrical studies and hazard analysis

Oberon has created a web interface to the Heat Flux Calculator to assist in using the shareware. Please note that the program file can be downloaded into your computer as well (small DOS file) Oberon has created a document called “GUIDE TO USING THE HEAT FLUX CALCULATOR” to assist you to use both this web interface as well as the software. The following information is required of any task to properly evaluate each potential arc hazard using this Heat Flux Calculator:

  • Available fault current
  • Arc Gap (estimated)
  • Voltage
  • Minimum distance from the arc center line to the worker
  • Arc Duration, in cycles
  • Additionally, consider if your work involves equipment, which would be defined as an Arc-in-a-Box, which is the occurrence of an arc within an enclosed space such as electrical panel, motor control or switch gear as well as identify if the arc energy involves single phase to ground or a multi-phase arc fault

Using these variables and available software, the incident arc energy in calories/cm2 for a given arc hazard can be calculated.

This data will then assist you to determine which level of protection (daily wear, arc flash suits, hoods or face shields) provide protection for your task.


Enter the arc current(amps)
Enter the arc gap(inches)
Enter the supply voltage(volts)
Enter the distance from the arc to the receiving surface
Enter the number of cycles for the arc duration
Select one (1) of the conditions that best resembles the conditions you are working in:
Single Phase Open Space
Three Phase Open Space
Three Phase ARC-in-a-BOX ~ 18" from Arc Source (Arm's Length)
Three Phase ARC-in-a-BOX ~ 60" from Arc Source (Working with Hot Stick)
Select one (1) of the conditions that describes the AC current frequency
you are working with
60 Hz - USA, Canada, Mexico and elsewhere
50 Hz - Typical in Europe, Africa, Australia, Asia and South
If you have questions or using other current frequency, contact Oberon Technical Support for assistance ([email protected])
The Heat Flux Calculator is not designed for DC calculations. If you have any questions on DC applications, please contact Oberon Technical Support for assistance ([email protected])
   
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ELECTRIC ARC HEAT FLUX CALCULATOR

Adapted for web usage by Oberon Company

This program is made available to the general public for
the purpose of calculating heat flux received at a surface
some distance from an electric arc. The use of this program
is the responsibility of the user. The author makes no
warrany to the accuracy of the results and accepts no
responsiblity any damage that may arise from its use.
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