Minnesota Electrical Code · 2023 NEC
Electrical drills
Spot the violation in residential and light-commercial electrical work. Answers cite the 2023 National Electrical Code as adopted in Minnesota, with 2026 NEC cross-reference notes.
Citations are to the 2023 NEC. Minnesota applies the 2026 NEC to permits filed on or after Aug. 17, 2026 (Minn. Rules 1315.0200). Most rules carry over; check the 2026 note on each answer. Minnesota code
Boxes, enclosures & covers6 drills
NEC 314, 312, 110.12. Box fill, covers, support, cable entries, accessibility.
NM cable & wiring methods6 drills
NEC 300, 334, 330, 320. Securing, protection from damage, where NM/MC/AC may and may not be used.
Panels, breakers & overcurrent7 drills
NEC 110, 240, 408. Double taps, wrong breaker, working space, panel location, directory.
Grounding & bonding6 drills
NEC 250. Electrodes, EGCs, neutral-ground separation, water pipe and gas bonding.
GFCI, AFCI & receptacle devices6 drills
NEC 210.8, 210.12, 406. Where protection is required, tamper and weather resistance, covers, orientation.
Dwelling circuit & receptacle layout6 drills
NEC 210.11, 210.52, 210.70. Spacing, countertops, islands, bathrooms, laundry, garages, lighting outlets.
Luminaires, fans & switches6 drills
NEC 404, 410, 314.27. Closet clearances, tub zones, recessed cans in insulation, fan boxes, switch grounding.
Services, outdoor & underground6 drills
NEC 225, 230, 300.5. Drop clearances, meter and disconnect rules, burial depth, emergence from grade.
Terminations, splices & conductors6 drills
NEC 110.14, 300.14, 300.15, 310, 200.7. Splices outside boxes, free conductor length, Cu/Al, ampacity, re-identification.
Appliances, HVAC, pools & special6 drills
NEC 422, 440, 680, 250.140. Disconnects within sight, dryer and range circuits, pool bonding and clearances.
Cords, temporary wiring & workmanship6 drills
NEC 400, 590, 110.12. Cords as permanent wiring, through walls, unused openings, neat and workmanlike.
Raceways & conduit6 drills
NEC 342-362, Ch. 9. Support spacing, fill, bends, fittings, expansion, wet locations.
Minnesota licensing, permits & inspections6 drills
Minn. Stat. 326B, Minn. Rules 1315/3800. Who may do the work, when a permit and inspection are required, what the state adopted.