BASIC LIGHTNING - protective angle - IEC 62305-3

METHOD 3 - PROTECTIVE ANGLE

This is a mathematical simplification of the rolling sphere method where the areas in green “G” and magenta “M” must be equal.
This is achieved by rolling the sphere up against a finial and scribing a line (red) whereby the area of “protection” (green) equals the “unprotected area” (magenta). α is the “Protective Angle”.

 
     
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