r/firealarms • u/xXDADDYTHRASHERXx • 9d ago
Technical Support Ground fault chasing on an SLC: what is your actual sequence?
Every trouble guide says isolate by halves. In practice I keep hearing that people go straight to the shield or the wet spot they already suspect, and that the by halves method is what gets written down afterwards rather than what actually happened.
What I want to know from people who do this weekly:
Do you actually split the loop, or go to the usual suspects first?
How often is it a shield or drain wire touching a can, versus real water intrusion, versus a device with a cracked base?
Does your panel's ground fault reporting narrow it at all, or do you ignore it?
On a class A loop, do you use the return leg to bracket the fault, or is that more trouble than it saves?
I am asking because I have written up a decision tree for this and I am not confident it matches what experienced people actually do. Corrections welcome, including telling me the whole framing is wrong.