>>"I am aware of transformer supplies. I was referencing to switch-mode supplies (transformer less). I believe they have isolation between primary and secondary.
Without a transformer? How are they getting any galvanic isolation? The transformer-less switched mode power supplies I'm familiar are most definitely _NOT_ isolated. I would like to see a design that was isolate. Mark AD5SS On Sun, Sep 4, 2011 at 4:15 PM, ron <ronc...@verizon.net> wrote: > I think we have missed the point. Any line powered device that has a > conductive enclosure should have that enclosure bonded to the 'green > wire'. It is a personnel safety issue. The KPA500 is line powered and > has a metal enclosure. > > REPLY: > Thus my point, the power supply for any radio is powered by AC and > should be wired accordingly as suggested with the "green" wire. > > > > > the KPA500 does *not* use a separate power supply. It has a built-in > power supply and so plugs directly into the mains outlet. > > REPLY: > Thank you. I stand corrected that the unit power is directly supplied by > AC thus the need for "green" wire. > > > > > 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. > > > REPLY: > I am aware of transformer supplies. I was referencing to switch-mode > supplies (transformer less). I believe they have isolation between > primary and secondary. > Radios using this type of supply should not need the "green" wire to > radio. It should go to the power supply itself as explained above. > > > 72 > Ron, wb1hga > > > > ______________________________________________________________ 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
