Ground Fault Isolation Flowchart for SLC and NAC Circuits

A flowchart for isolating a ground fault on a signaling line or notification appliance circuit: verify the indication, check whether it is still present, section the circuit at the panel, test the left and right sections, repeat the sectioning in halves until the fault is narrowed to a device or short length of wiring, then repair, retest and restore, with notes, tips and abbreviations.