Over here in the Uk where we use addressable alarm systems, we are only permitted to take t taps off a system if it is wired in a four core and ground cable. You are not permitted to use a 2 core cable as it will not provide the recommended monitoring and re feeding of the loop if there is a fault and the isolators operate. With the systems we use, you can get an interface which you put on the loop and then wire a conventional zone with 2 cores to you r chosen area, and then it is monitored via the interface.
Nick
