How do i perform a galvanic test? On Tue, Dec 8, 2015 at 10:24 AM, Chuck McCown <[email protected]> wrote:
> The designer may or may not have tied the positive output to the chassis. > > You would have to galvanically isolate it and see if there is a voltage > from negative to chassis. > > You might be OK or you might have to isolate it from the rack. If you do > isolate it, make sure to put a sign on it that it is hot so someone does > not lay a tool on it or touch it with a metal ladder etc that could ground > it out and cause lots of sparks. I personally don’t feel –48 unless I am > hot and sweaty, so to me it is not much of a shock hazard but may be for > others. > > If you do isolate it, remember that the input AC probably has a ground > wire that will tie the chassis to earth ground. If the +48 is tied to the > chassis, you are going to have to disconnect the input ground too. > > And it is slightly possible, in an old and lousy design, that the AC > neutral could also be tied to the chassis. > > *From:* Gino Villarini <[email protected]> > *Sent:* Tuesday, December 08, 2015 4:12 AM > *To:* [email protected] > *Subject:* [AFMUG] Isolating a -48 rectifier? > > So, i was wondering if isolating a -48 dc rectifier from the rack/ground > would turn it into a polarity agnostic device? >
