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by sundaymorningstaple » Sun, 13 Jan 2008 11:56 pm
First of all, I'm not an electrician or electrical engineer.
But, I think that even if the building is grounded, the static discharge of a lightening strike could knock the breakers off. I was knocked out of my chair through my mouse in Seletar Camp a number of years ago. The building was struck by lightening and the grounding strap ran down the wall about 6 feet from where my office desk sat. I was grounded on the floor with wet bare feet having just come from outdoors in the rain. My family in MiL's house behind ours saw the lightening strike and the "St. Elmo's Fire" travel down the earthing strip and into the trap in the concrete sidewalk where the strap is grounded. The lightening actually hit the lightening rod on the roof and because my TV antenna base straddled (without touching) the strap that ran the length of the crown of the roof, the static discharge blew out our TV and apparently close enough to come through the power lines at some point, entering the PC and ground itself through the motherboard mouseport and my hand which was on the mouse.
Every time we have a thunderstorm it seems a close lightening strike causes numerous auto-alarm systems in cars to go off as well.
SOME PEOPLE TRY TO TURN BACK THEIR ODOMETERS. NOT ME. I WANT PEOPLE TO KNOW WHY I LOOK THIS WAY. I'VE TRAVELED A LONG WAY, AND SOME OF THE ROADS WEREN'T PAVED. ~ Will Rogers