Quick question for the trivia-minded: which obscure-but-legal code allowance has saved you time or money? On a 480Y/277V retrofit last fall, using gray for the grounded conductor per 200.6 kept the AHJ happy and avoided re-pulling about 1,200 ft of THHN — saved us a day on the timeline and protected the materials budget.
On retrofits, “312.8” has bailed me out: splices/taps in the panel are fine if you keep wire-bending space and the 40%/75% fill limits in check, so I land short MCs in the gear instead of hanging a gutter — saves hours and a handful of fittings. Some AHJs still side-eye it; @InspectorRay, are you seeing consistent approvals on service sections?
240.4(B) “next size up” has saved me plenty — I’ll leave #2 Cu THHN on a 125A feeder with 75°C terminations instead of bumping to #1 just to match what’s on the truck. Just don’t try it on 14/12/10 AWG or where the gear’s only 60°C; your AHJ chill with that?