M1 - Determining EOL resistor location on zone

[jantonecchia]

I'm sure this topic was covered before but I cant seem to find the thread. If I have several sensors wired in series at the panel (each sensor on a home run to the panel). Which one is the farthest from the panel? Technically each zone is one big loop spliced together at the panel. Do you pick the one closest to the middle of the group and consider it farthest from the panel? Also my window sensors seem to have a removable cover where I can access the wire screws within the sensor...can I put the resistor across these screws?

 

[Sandpiper]

I'm sure this topic was covered before but I cant seem to find the thread. If I have several sensors wired in series at the panel (each sensor on a home run to the panel). Which one is the farthest from the panel? Technically each zone is one big loop spliced together at the panel. Do you pick the one closest to the middle of the group and consider it farthest from the panel? Also my window sensors seem to have a removable cover where I can access the wire screws within the sensor...can I put the resistor across these screws?

In the case where you have multiple contacts series into one zone, an EOL does little to no good. You can only have one EOL per zone, and so you must pick which contact to put it on. It doesn't make any difference for the circuit which contact it goes on. However, you will get no circuit integrity protection on any of the other contacts in the loop.

If the contacts had been wired in series (like they used to wire security systems), it would make sense to put the EOL at the farthest end. When the contacts are wired in a star fashion (or home run), it doesn't make much sense to use an EOL for the circuit.

When wiring in an EOL on a burglar curcuit, the EOL does not go across the contact terminals, it goes in series. One lead wire to one contact terminal, the other lead wire to one end of EOL. The other end of the EOL goes to the other contact terminal.