[GreenKeys] Question about the voltages

[kf9nz at juno.com]

                ...Which was a common arrangement where "duplex sets"
using polar relays were used.  


On Thu, 22 Nov 2007 14:51:53 +0000 (GMT) sdaitch at mor.ibb.gov writes:
> 
> Maybe I am missing something, but unless there more than one power 
> supply source (in reference to a common point, generally ground) is 
> involved, there should never be a voltage difference of 520 volts 
> between conductors.
> 
> Given a 260 volt DC power supply, positive ground, with -260VDC on 
> the cable, any two conductors fed from the same source would have 
> zero (or near zero, if any load) potential between the two 
> conductors.  The only way to have 520 VDC between the two conductors 
> would be to have two 260VDC sources, one with a negative ground, the 
> other with a positive ground.
> 
> 
> 
>  
> 
> 
> 
> 
> 
> > 
> > Worst case, the 260 volts carried could have been laid against 
> another
> > similar circuit and we could have possibly see 2x260 = 520 volts.
> 
> 
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