My big Cyberpower is still under warranty…they don't even want you running an
extension cord out of the socket!
When I was testing it, I noticed rf hash in spots throughout 80 and 40
meters….and I ordered it new specifying for telecommunications use!
Will keep in mind what you typed below when I pull the case apart for twice
annual dust bunny removal next winter.
On Sep 2, 2014, at 12:31 PM, "Bob McGraw - K4TAX" <RMcGraw@Blomand.net> wrote:
> You raise a point regarding "industrial grade sine wave ups". I have one of
> those and in my chasing a noise issue, I opened the case to find the output
> receptacles each have the neutral terminal {white wire} and the 3rd pin
> ground terminal {green wire}connected by a solid strap. This then says the
> neutral is connected to 3rd pin ground at several points, both on the input
> and output. I seem to recall this is not correct according to NEC.
>
> Anyway, I removed the straps and my noise went away. Now, this does leave
> the 3rd pin AC ground terminal on the LOAD side of the UPS connected to the
> 3rd pin ground on the INPUT side of the UPS. The neutral however is not
> connected from the LOAD side to the INPUT side, thus there is significant
> isolation between input and output of the UPS. As it should be in my
> thinking.
>
> Is there some UL requirement, say UL1499, or other international standard
> that I'm not aware that mandates the load neutral and 3rd pin AC must be
> bonded? It has been too many years since I worked in this part of the safety
> discipline.
>
> Comments anyone?
>
> 73
> Bob, K4TAX
>
>
>
>
>
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