Eaton Bi-Wire Circuit End of Line Module 2, 4 and 8 Zone variants utilise an intelligent end of line module (EOLM-3™) to continually monitor each zone for the presence of Fault indications such as detector head removal, device fault (open or short circuit) and for end of line failures even when in a Fire indication condition. The EOLM-3™ module can be placed into the base of the last manual call point or detector base. Each zone circuit of the panel requires an EOLM-3 to be fitted. This means an 8 zone variant will require 8 modules.