Architectures – Automatic fault location IM400 and XD312 IM400: Insulation Monitoring Device - injects combination of low frequency voltages - displays global R and C - Alarm + prealarm thresholds. XD312 are detectors, used with an IM400 PIM module, to have an automatic location of the fault on the network (connected to toroids on the circuits being monitored). Upto 12 feeders monitored per XD312. Fig. Architectures – Automatic fault location IM400 and XD312 Refer Fig‐1 How to connect Refer Fig‐2 how to connect Manual fault locating kit for downstream distribution.