http://elecraft.85.s1.nabble.com/Grounding-negative-side-of-power-supply-tp4424150p4928879.html
Refer to the NEC. It's their rule.
if they find improper grounding contributed to the damage. And they
> 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
>
>
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