Electrical
New construction residential. AFCI/GFCI combo breaker (Square D HOM120CAFI) on a 20A kitchen circuit keeps tripping — not at load, just randomly. Sometimes in the middle of the night. Ran a new circu...
Got a 200-foot run of 4" rigid PVC with a 90 at each end, pulling 4x4/0 XHHW-2 aluminum for a 600A service. Building is occupied so I can't open the ceiling — it's a through-floor run in a mechanical ...
Running into intermittent startup failures on a commercial install. 40x Meanwell HLG-240H-C700B LED drivers on a single 20A circuit at 277V. Panel schedule shows Circuit 14 — all drivers wired parall...
Running into this more often with variable speed drives and newer motor designs. Motor nameplate says 12.4A FLA. Actual measured current at full load is 9.8A. This is a 5HP, 460V, 3-phase induction mo...
Working a 180-room hotel renovation. AHJ is requiring NEC 210.52 compliance per guest room — minimum receptacle spacing requirements as if each room is a dwelling unit. My reading: 210.52 applies to ...