High Voltage Arc Gap Calculator

This arc voltage calculator can help you understand how a Dielectric Withstand Test helps your quality process. This calculator also shows how using a Helium atmosphere can help your test be more stringent. If you have any questions about high voltage testing or this calculator please call us - 1-800-441-9910.

Enter your Dielectric Withstand (DW) Voltage
(Volts DC, 400 - 3000V)


 
Results
Equivalent AC DWV : ___ Volts
Arc Distance in Air (min): ___ inches (___ mm)
Arc Distance in Air (max): ___ inches (___ mm)
Arc Distance in Helium : ___ inches (___ mm)
Explanation

Your Dielectric Withstand Test uses ___ Vdc (or ___ Vac).

If the test passes it will confirm that the smallest gap between exposed conductors in the cable is likely greater than ___ inches (___ mm).

If the test fails you may have a gap less than ___ inches (___ mm). If the DWV test is done in helium then the test might detect a gap as large as ___ inches (___ mm).

For more information on testing your products in a helium atmosphere see our Using Inert Gas to Enhance Electrical Wiring Inspection article.

Notes: The "Arc Distance in Air (min)" calculation is based on empirical data for a sharp point arcing to a plane. The "Arc Distance in Air (max)" calculation is based on empirical data for a plane arcing to a plane. The "Arc Distance in Helium" calculation is based on empirical data for a sharp point arcing to a plane in a helium atmosphere. Both calculations are for standard pressure (760 mmHg) and room temperature (72 °F, 22.2 °C).

 If you are interested in more details on these calculations you can search for Paschen's Law. You can also download a spreadsheet with the caluclations used in this calculator here.