Refer to the NEC. It's their rule. As a side note, a loss of property covered by insurance may be dissallowed if they find improper grounding contributed to the damage. And they reference the NEC with regard to "proper".
73 Bob, K4TAX ----- Original Message ----- From: "Jim Brown" <j...@audiosystemsgroup.com> To: "Elecraft List" <elecraft@mailman.qth.net> Sent: Monday, April 19, 2010 7:49 PM Subject: Re: [Elecraft] Grounding negative side of power supply? > On Mon, 19 Apr 2010 19:36:29 -0500, Bob McGraw - K4TAX wrote: > >>Now, with the radio connected between the receiving >>antenna and the AC mains, the path for the current difference is through >>the >>radio and power supply. > > I'm with Tom on this one. Here's why. First, remember that lightning is > NOT > DC, it is RF, with spectra VERY broadly centered around 1 MH. Second, the > coax from the antenna MUST be bonded to the building entry panel, and from > there to all the house grounds. Third, the coax from the RX antenna SHOULD > have at least one big honker ferrite choke on it at the antenna end, and > another near the station. In other words, there should be at least several > K > ohms in series with the coax at the frequency of lightning. That causes > lightning to seek a lower impedance path to earth than one through the > house > (and the shack). Like the ground rod at the antenna. > > Bottom line -- I don't see a bond helping lightning safety, and as Tom has > noted, it sure doesn't help with RX noise. > > 73, > > Jim K9YC > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
