I'm searching my electrical system for defects, fixing the last guy's work. He loved to cross neutrals (grab a hot from circuit 5 and neutral from circuit 19). I've found several instances, but it's really slow going.
It seems like I could speed this up a lot by turning on every load, putting dummy loads in every receptacle chain (night lights), and temporarily installing a GFCI, and see if it trips. I'm comfortable with that plan.
However, he also loved multi-wire branch circuits. I've given them special attention and I think they're OK, but want to test them nonetheless. This panel is obsolete, and a 2-pole GFCI breaker is prohibitively expensive. So I want to use the 1-pole GFCI to test half the MWBC at a time. The other hot would cause a false reading, so I just want to disconnect it temporarily.
Does this seem like a reasonable plan?