[Elecraft] Issue 12 re Astron Power Supply

[Joe Subich, W4TV]

On 2018-04-16 8:38 AM, Charlie T wrote:
 > Your comment can be taken both ways.

What are you - a lawyer?

Connecting the station ground (bonding) and the entry ground to
the power system safety ground at other than the power meter
(power system entry point) greatly increases the chances for
damage.  It is also (as nearly as I can tell and I am not a
lawyer) a violation of the National Electrical Code and most
local building codes (which incorporate NEC).

Consult an electrical contractor and/or code enforcement officer
to be sure, but my understanding of the rules are that the ground
conductor of all cables (e.g. coax shields, etc.) entering the home
must be bonded to the electrical system ground (at the electrical
entry).  If the entry points are separated, all subsidiary entry
points must be bonded to the electrical system ground using a
large cable *external* to the building.

73,

    ... Joe, W4TV


On 2018-04-16 8:38 AM, Charlie T wrote:
> "This greatly increases the chances for damages to station equipment and all other electronic equipment in the household in event of a lightning event."
> 
>   What is, disconnecting the wire or leaving it in place?
> Your comment can be taken both ways.
> 
> 73, Charlie k3ICH
> 
> 
> 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Joe Subich, W4TV
> Sent: Monday, April 16, 2018 8:11 AM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Issue 12 re Astron Power Supply
> 
> On 2018-04-15 10:38 PM, hawley, charles j jr wrote:
>> I disconnected the black wire. When it was connected, much of the
>> current that would have passed thru the negative power wire from the
>> power supply to the rig was shunted thru the green power cord wire,
>> the ground buss bar, and other ground connections.
> More importantly, if the "station ground" - the ground from the antenna entry panel - is not bonded to the power entry ground, a lightning event can be carried from the chassis of the power supply back through the electrical system safety ground to the power entry *or vice versa* depending on the location of the "strike".
> 
> This greatly increases the chances for damages to station equipment and all other electronic equipment in the household in event of a lightning event.
> 
> 73,
> 
>      ... Joe, W4TV
> 
> 
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