Re: Need help identifying N.O. or N.C.

["JW" <jweb@xxxxxxxxxx>]

Neither...NO/NC contacts are just that. Open or closed circuits.  The
circuit you described is low voltage, on or off.

"John Brummitt" <jdb5@xxxxxxxxxxxx> wrote in message
news:hpmdnWoi8MxKhKXeRVn-pA@xxxxxxxxxxxxxxx
> I'm having trouble figuring out the type of sensors I have ( N.O. or
> N.C. )
> Each zone has a 15K resistor from the loop power to the zone.
>
> The wireless receiver has 2 wires running to it to supply 12 Volts and
> each zone has
> 1 wire running back to the zone screw where the 15K resistor is attached
> so that the 15K is always
> supplying a little power to the zone screw.
> When the zone is tripped the wire from the wireless receiver becomes a
> ground for that zone.
> So the power flows from the loop power through the resistor, then through
> the now grounded wire.
>
> Would this be a N.O. or N.C. circuit?
>
> Thanks,
>
> John
> jdb5@xxxxxxxxxxxx
>
>