EOL resistors on an HAI OP2--proof they don't belong at the panel end?

[gatchel]

I love EOL discussions

The real solution is to have contacts and switches that are "active", powered components which send digital supervison (similar but more constant than wireless) to the panel zone. Shorting, disconnecting etc would disrupt the flow of supervisory information and trigger the zone. Another thought in todays world is that if (big if) current components and connections were more stable than they actually are each zone could be set to a particular resistance / impedance. Any change and the zone would trigger.

I can agree with the digital supervision for larger systems. There are several systems out that use a polling loop or a data bus for devices in that loop. Some fire systems I have seen others working on use that same sort of topology when each unit has an ID that scanned in with a barcode reader or entered manually.

Personally for a home alarm system I would rather be able to fix the problem using a meter and a resistor and the end device (motion , contact, etc).

 

[Photon]

I chose to use surface mount contacts on the sashes of my basement windows. The wires are entirely hidden/protected except where they exit the window casing to attach to the magnetic switches. It seems to me the only place a bad guy would short the circuit is at that point, and an EOL anywhere but inside the body of the sensor, as with the GRI switches, would not help. I chose to use no EOLs, but I do have PIRs and glass breaks in the areas of interest. Outdoor light beams to come.

 

[ASIHome]

Of course there are always options. I think most installers are not going to take the time, but you could avoid the Beenies and just solder the EOL with heat shrink OR you can use the George Risk (GRI) contacts with the embedded EOL. That way, you get the EOL where it belongs, there are no additional wiring concerns AND you keep your panel neat and free of EOLs. The only downside is the contacts cost more and depending on what EOL you need, it may have to be special ordered. I don't know the the HAI panel takes, but Automated Outlet has the GRI contact with 2.2k EOLS for the Elk here. They may also stock the regular 110's also.

HAI = 1K resistors

GRI 3/8" contact w/1K built-in - http://www.asihome.com/ASIshop/product_inf...roducts_id=2985