RE: slightly off topic

The more dangerous concern is that there is backfeed from a parallel
connected power source.  I have seen older installations where there is
more than one source from a single phase, possibly to avoid having to
run a bigger wire.  Not a good way to do things but it has happenned.
Another possibility would be a malfunctioning power transfer switch if
there is redundant power available.  The transfer switch would have to
have really good phase matching though, or the clouds of black smoke and
noisy bang would give it away immediately :)

That would explain the voltage drop too, if the alternate feed was
inadequately sized.

I know it is an inconvenient test for a NOC, but with equipment
connected, if you open the breaker then AC voltage should measure in
millivolts, if not actually zero.  If there is significant voltage, or
ANY current flow with the breaker open then there is a serious problem
that needs to be dealt with by a licensed professional.



> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of jp
> Sent: Monday, March 03, 2008 9:19 AM
> To: [email protected]
> Subject: Re: slightly off topic
> 
> As far as cross-circuit bleeding, if a circuit has no loads 
> and is shut off, it can still generate some voltage by 
> induction from other nearby circuits. There will be no 
> current to speak of, but there will be voltage. Digital 
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