HI again

Following on from another question i would also like to know how to wire more than 1 sensor on a circuit. Whenever in the past i have done this, when testing the system it has failed to activate. I assume this can be done as some systems have more than 8 detectors.

 

Chris

Chris

Again a series circuit is used. Below is a wiring diagram for PIR's and Door contacts in series.

 

 

But

Its not advisable to wire more than one device per circuit as you cannot identify which circuit has activated. It also doesnt comply, as with electronic devices you must be able to identify which device has activated. Wiring 2 PIR's or all of the ground floor into one circuit will not give this indication. Modern panels above the budget units provide many more than 8 zones so this isnt usually a problem. Panels such as the Galaxy 2-20 allow for 12 zones on-board but accept an additional 8 zone expander (the 2-44 will expand to 44 circuits this way) to allow for this. Alternatively latching PIR's or shock sensors latch (keep the led active on the sensor until reset) to provide this indication.

 

Galaxy 2-20 control panel

http://www.securitywarehouse.co.uk/catalog/index.php?main_page=product_info&products_id=193

 

Latching Optex PIR

http://www.securitywarehouse.co.uk/catalog/index.php?main_page=product_info&products_id=1273

 

Latching Shock Sensor

http://www.securitywarehouse.co.uk/catalog/index.php?main_page=product_info&products_id=542