Earth Fault Detect Feature, Simplex 4100U and ES 

This is a quick demonstration on how to use the built in Earth Fault Detect feature on a Simplex 4100U and ES. It doesn't work in all situations but it's worth a try before tearing the panel apart. Please note, this will only work with 4100U ans ES components. 4100Classic and Plus components do not have this feature incorporated so even if you have a 4100U or ES head end and the feature exist, it won't do anything.