Re: Color code for home alarm wiring

["Rocky T Squirrel" <gafa_usa@(nospam)hotmail.com>]

do a reference voltage check against the loop ckt and you;ll notice a -12 at
some point..  also  some panels use a reverse current to help supervise a
circuit (ie.. fire outputs, spkr outputs)
((always a reason))
RTS

"Okitoki" <okyaysenturk@xxxxxxxxx> wrote in message
news:1140800710.724683.19500@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Now I have another topic that should raise some eyebrows...
>
> Why in all of these years do we use +12V and -12V? In electronics, the
> difference is 24Volts!! In Electronics you should use +12V and 0V. But
> they use plus and minus on everything!! On panels, on batteries,
> everything! Could someone technically explain why -12V is used instead
> of 0V's?
>
> Thanks!
>