Re: Dammit.. How to get 2 zones and power from a 4-conductor

["Robert L Bass" <no-sales-spam@bassburglaralarms>]

>> I never planned on putting the tampers
>> on a separate 24 hour zone - otherwise
>> I would have run 6 conductor.  Now he
>> wants that "feature", and the trick for
>> sharing a 'common' wire for power and
>> zone won't work as far as I can tell.
>> Am I correct, or is there a way to do it
>> without running more wire?

Yes, the common wire method will work.
You'll need one extra zone per detector
unless your detectors have a form "C"
tamper.  In that case you can get by with
one common tamper zone but it won't be
fully supervised.

2-Zones per Sensor Method with the panel
using negative for zone returns:
At the panel:
- Connect Red to +12V Aux.
- Connect Black to Common Negative
- Connect Yellow to alarm zone
- Connect Green to tamper zone
At the detector:
- Connect Red to +12VDC
- Connect Black to -12VDC
- Connect Yellow to alarm NC
- Connect Green to tamper NC
- Wire two EOL resistors in the PIR:
  - Connect 1st EOLR from -12VDC to alarm C
  - Connect 2nd EOLR from -12VDC to tamper C
If the panel uses positive for the zone returns
connect the EOLRs to the +12VDC in the PIR.

The above is the more secure of the two methods
but it uses more zones.  Following is less secure
but uses only one tamper zone.  The problem is
it requires PIRs with a form C tamper.

At the panel:
Wire everything the same as above but splice
all of the Green wires together and run a pigtail
from the bundle to one zone which is programmed
for tamper.  Jump the tamper zone with en EOLR.

At the detectors:
- Connect Red to +12VDC
- Connect Black to -12VDC
- Connect Yellow to alarm NO
- Connect Green to tamper NO
- Connect an EOLR from -12VDC to alarm C
- Jumper a wire from -12VDC to tamper C

This method supervises the alarm output but not
the tamper circuit so it's not as secure as the first
method.  However, if there aren't enough zones
for two per detector it's better than no tamper at all.

--

Regards,
Robert L Bass

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