A technique for determining the minimum safe-leakage distance for electrical power installations has been established. This method recognizes the damaging effects of surface leakage currents and establishes a voltage, called the tracking voltage, associated with these leakage currents as a criterion for minimum leakage distance. The proposed technique gives results that recognize the effects of environmental conditions and surface contamination as well as the arc-resisting qualities of the insulation. Recommended leakage distances have been prepared on the basis of measured values of contamination found on submarine electrical panels. Minimum clearance distances were evaluated and a method was proposed for the establishment of safe values.
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