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Join Date: Mar 2010

Posts: 7

Earthing & Lightning

04/10/2010 3:42 AM

how i can be sure that the Earthing & Lightning system is working?????

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dvmdsc Guru Join Date: Mar 2010 Location: In the pool because it is too hot. Posts: 3054 Good Answers: 141	#1 Re: Earthing & Lightning 04/11/2010 8:34 PM
	A measurement of the to earth impedance will show you a ohms value. This should be lower in value than the value of the "body" to protect. Lightning strikes are locally and do appear on spots that make the current flow easy to the earth. The highest and most conductive lightning catchers have the highest probability to trap the lightning to the ground. If you want to protect a steel construction, go high, or put multiple catch poles on different spots and elevated heights. TEST: wait for a strike. __________________ Plenty of room here
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#2 Re: Earthing & Lightning 04/14/2010 7:59 AM
	The earthing system will have been designed and tested in accordance with British Standard 7671 (yet again) so as to provide adequate personal protection by disconnecting the circuit protective device in the event of a fault developing downstream of it. The lightning arrestor will be seen working when lightning strikes it. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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