A Loop occurs when a conductor feeds back into itself. In Figure 2, the Loop is highlighted in orange.
Figure 2, Loop
Loops can cause problems such as indeterminant flow with ArcMap's native tracing tools. However, ArcFM's traces (upstream and downstream) utilize Feeder Manager to identify loops in the network. If any paths discovered by the ArcFM traces contain features belonging to an electrical Loop, then all features in the loop will be included in the results.