[Elecraft] KPA500 - ground wire between the AC earth and RF output socket

[Rick Dettinger]

A power supply transformer can't be considered to be totally isolating  
for safety purposes unless there is a shield between the primary and  
the secondary that is grounded to the primary.  Some marine shore  
power isolating transformers have this shield, but they are quite  
expensive and not usually used.  Without the shield, there is a  
possibility for an internal short that would tie the secondary  
directly into the AC mains.  Thus, the rig that is powered by the  
supply needs to be grounded to the AC ground system.

73,

Rick Dettinger   K7MW



>
>
> I have not seen the manual mentioned in this thread, and
> I may be unclear regarding this, but as all ham radios derive power  
> from
> their separate power supply, isn't the "switch-mode" type isolated?
>
> then the required "green wire" in the AC line should be tied to the
> power supply, not the radio.
>
> Please correct me if I'm wrong.
>
> 72
> Ron, wb1hga
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