You can use this page to calculate minimum approach distances for phase-to-phase system voltages exceeding 72.5 kilovolts in accordance with 29 CFR 1910.269 and 29 CFR Part 1926, Subpart V, as follows:
The calculator provides the minimum approach distance, in feet or meters (depending on your selection), for phase-to-ground and phase-to-phase exposures.
Footnote (1) Enter the maximum anticipated per-unit transient overvoltage, phase-to-ground, determined through an engineering analysis or assume a maximum anticipated per-unit transient overvoltage, phase-to-ground, in accordance with the following table:
|Voltage range (kV)||Assumed maximum per-unit transient overvoltage|
|72.6 to 420.0||3.5|
|420.1 to 550.0||3.0|
|550.1 to 800.0||2.5|
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