My sailboat was at the wharf, plugged into shore power when a
thunderstorm passed by about a 1/4 mile away. Each lightning flash was
accompanied with an arc over SNAP in the 120v outlets. Scary how much
voltage that takes. My exposed lead keel in salt water was tied to the
shore power grounding lead. Concluding I was the best local power grid
ground, I quickly disconnected from shore power.
Grant KZ1W
On 7/23/2013 6:38 PM, Spencer wrote:
I did some maintenance on a steel boat. The utility company had
connected the ground to
the hull when connected to shore power. There was serious corrosion
problems. I measured
the ground wire current with a amp-probe, 3 amps. I disconnected the
ground and the problem went away.
Your tower might be the ground connection for the electric utility
company. The waveform is
distorted and has a DC component that will cause big problems and a
nice place for current flow
during a lightning strike.
Spencer
W1GAK
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