Ohms law intruder alarms

[StePugh]

What tests and how do you go about commissioning an intruder alarm system due to ohms law.what readings must you look for what resistance levels to check for in tamper circuit alarm circuit, quiescent circuit and how do you commission the PIR's to the CIE and how do you test different wiring like FSL (Eol) wiring or Double Pole wiring. Thanks Ste.

 

[telectrix]

measure the loop resistances alarm and tamper. readings will be the resistance of the cables, except with active devices where you will have open circuit on the alarm pair with no power to thre device, and in the region of 10 ohms when powered. with eol resistors, the reading will be the eol resistor if the detector is closed, and both resistors added if the detector is open.

 

[StePugh]

Sound!

 

[StePugh]

And when you are measuring loop resistance how many ohms is it again per 100 metres is it 16 ohms?

 

[firespark]

92 Ohms per KM on CQR cable. (9.2 Ohms per 100m)

In terms of commissioning tests that require a meter and documenting:
Detection zone resistances per circuit in a quiescent state.
Current draw from each powered device.
Whole system load test current draw in quiescent and alarm.