Safe Clearances At Altitude

This calculator provides values of safe clearances required between air gaps at a specific altitude. The methodology used in the calculation is based on IEC 60664-1. A further adjustment is made for PWM voltages (where breakdown voltages may fall by 20%). If the clearance is also accompanied by an identical  creepage distance, you should note that this will generally set the safe distances in the gap (creepage distances fail at a lower voltage than the equivalent clearance).

The calculator can be used for altitudes between 0m and 20,000m.

Calculator

Environmental Parameters


Altitude (h)
Temperature
Pressure
Equivalent Pressure

Gap Parameters


Peak Voltage
Safety Margin
Required Clearance


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