SIEMENS LIM-1The Model LIM 1 Loop Isolator module from Siemens Industry, Inc., isolates short circuits on MXL and FireFinder XLS intelligent device loops. By placing devices between LIM 1s during installation, a short in the wiring within that group is disconnected from the rest of the loop. The remainder of the devices continue to operate. The LIM 1 operates in both Class A and Class B circuits. A yellow LED flashes when a device detects a short circuit. The LIM