High voltage spark gap

Clanky | 19:43 Mon 19th Mar 2007 | Science

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What's the largest distance a spark can jump from an 11Kv overhead power line to a good conductor in credible UK weather conditions? I applied Paschen's Law, using the peak voltage and worst case single environmental conditions found on the net to get a figure but I'd welcome confirmation.

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mibn2cweus

Roughly 1/2cm based on this source with many other variables to consider. This is definitely not a distance suitable as a margin of error for safety considerations! ! ! Once a spark has been established it can grow to many times the distance required for its initiation.

A typical safe distance from power distribution cables is
no less than three metres. here�s why

Clanky

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Many thanks for your interest. I calculated 4.21mm, which is consistent.

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