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Version 6.10
General Information
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Volts Informative Downloads
Volts Features
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All Volts Features
Branch Circuit Load Calcs
Circuit Layout
Cable Tray Fill
Circuit Load Analysis
Conduit Fill
Device and Metal Box Fill
Efficiency Factor
Motor Ampacity and Characteristics
Motor Startup Ampacity
Ohm’s Law
Power Factor
Power Factor Correction
Resistor Color Codes
Series Location Voltage Drop
Transformer Sizing
Unit Conversions
Utility Transformer Values
Wireway Fill
Circuit Breakers
Device and Metal Boxes
Arc Blast Pressure
Arc Flash Labels
Custom Reports
One Line Diagrams
Panel Schedules
Report PDF Samples
Short Circuit Analysis
Surge Protection Analysis
Formulae & Methods
Voltage Drop Formulae
Conductor Sizes
Ohm's Law Formulae
SI Units
Short Circuit Analysis  

Download in PDF Format

Protect Your Equipment from Short Circuit Damage

All electrical systems are vulnerable to short circuits and the irregular current that they cause. Because of this vulnerability and the potential costs of repairing the damage that is done, it is extremely important to calculate short circuit currents before any problems can occur. Following IEEE Std. 141 and 242, Volts allows you to perform a per unit calculation on any system you are working with. Volts automatically converts the entire system (panel boards, transformers, generators, motorized items and cables) into a unique impedance unit from which you can obtain the rating of the short circuit current at any given point. The process is simple, efficient and will save you both money and time.

Short Circuit Functions in Volts:

  • IEEE standard computations of symmetrical
    short circuit current for each panel board.
  • Asymmetrical short circuit current computations
    using first article of decay formulation.
  • Computes contributions from generators, motors,
    transformers with reductions from cables sensitive to definable ambient temperature.
  • All motor contribution LRA values are individually computed from the letter code rather than simplistic and inaccurate ratios.
  • Complete and entailed Utility Transformer Characterization.
  • Calculations for power distribution applications
    are as quick and easy as a menu selection.

Verification and Accuracy

You'll know what you've got when Volts displays the short circuit values in a report or one line riser diagram. These reports will include every buss in the system and will be based on the input values of each entered device, transformer, generator and panel. Accuracy doesn't get any easier than that.

In addition, Volts checks every cable in the system, comparing the panel board's SCA capacity with the cable's SCA capacity to ensure that the insulation won't degrade. Volts makes it simple to know exactly what your system is going to do.


Volts' short circuit formulae and methods produce the most accurate short circuit results possible. This is important not only to ensure correct panel bracing and cable sizes but also to ensure accurate Arc Flash values for each panel board.

  Other Short Circuit Related Features, Functions and Capabilities
  • Compute SCA with mixed phase systems
  • Compute motor LRA as contribution (sensitive to reduced voltage motors, not inaccurate ratios)
  • Adjustable ambient temperature in addition to IEEE standard 25°C for cable impedance reduction
  • Utilize UL 7.5% tolerance for transformer percentage of impedance (Z)
  • Utility Line Starting Power in MVA
  • Base Line Voltage in kV or Utility Transformer Primary Voltage
  • Base Transformer Power in kVA or Utility Transformer rated kVA
  • Volts includes the IEEE std. 141 Average Utility Transformer percent of impedance, XR ratio, Reactance and Resistance values
  • Infinite Buss computations based on either base values or utility transformer values


It simply cannot be any easier or more accurate to obtain the correct information the first time.


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Reprinted with permission from NFPA 70 2008, NEC® copyright© 2008, National Fire Protection Association. This is not the complete and official position of the NFPA on the referenced subject which is represented only by the standard in its entirety. The title National Electric Code® and the acronym NEC® are registered trademarks of the National Fire Protection Association (NFPA).

Volts is a registered trademark of Dolphins Software

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