NEC 90.12: final inspection checklist

What NEC 90.12 Actually Requires

NEC 90.12 (introduced in the 2023 NEC) is titled Wiring Integrity. It's short, but it carries real weight on a final walkthrough. The rule requires that once an electrical installation is complete, all components must remain in the condition required by the Code. That means covers reinstalled, knockouts sealed, supports intact, and nothing left open to physical damage or foreign matter.

In practice, 90.12 gives the AHJ a blanket hook to reject a job where trim-out was sloppy, even if each individual install passed rough-in. If you pulled a cover to troubleshoot and forgot to put it back, that's a 90.12 violation now, not just a housekeeping note.

The rule applies to the installation as a whole. That includes raceways, enclosures, cabinets, boxes, fittings, and any mechanical protection required elsewhere in the Code (see NEC 300.4, 312.5, 314.17, 408.7).

Walk the Job Before the Inspector Does

The 90.12 checklist is essentially a punch list. Before you call for final, do a lap with the prints and a flashlight. Most rejections come from the same five or six things, and they're all cheap to fix if you catch them yourself.

Focus on openings first. Anywhere a cover, plate, plug, or closure is missing, you've got an integrity failure. NEC 110.12(A) backs this up by requiring unused openings in boxes, raceways, cabinets, and equipment to be effectively closed.

• Panelboard deadfronts installed, all breaker knockouts filled or occupied (NEC 408.7)
• Device plates on every box, including blank covers on junction boxes (NEC 314.25)
• Unused KO's plugged with listed closures, not tape or caulk
• Raceway fittings tight, locknuts double where required (NEC 250.97)
• Weatherproof covers closed and gasketed on 210.8 locations
• Service equipment labels legible and present (NEC 110.21, 110.24)

GFCI, AFCI, and Tamper-Resistant Verification

Final is where protection devices get tested, not just installed. Press the test button on every GFCI and AFCI receptacle. If it doesn't trip and reset cleanly, swap it. NEC 210.8 and 210.12 don't care that the device was listed when you bought it, they care that it functions at turnover.

Verify tamper-resistant receptacles per NEC 406.12 in dwelling units, guest rooms, child care facilities, and the other locations now enumerated. A quick visual: the shutters should be visible behind the slots. If you can see straight through, it's a standard receptacle and it fails.

Field tip: carry a plug-in circuit tester with GFCI trip on the truck. Three minutes per floor beats a callback. If the tester trips a breaker instead of the GFCI, you've got a miswire on the load side, not a bad device.

Grounding, Bonding, and Labeling

90.12 indirectly pulls grounding and bonding into the final review, because a missing bonding jumper or an unterminated EGC is a direct integrity failure. Open the service, confirm the main bonding jumper is landed per NEC 250.24(B), and confirm the grounding electrode conductor is connected and protected per 250.64.

Every subpanel downstream of the service needs the neutral isolated from ground (NEC 250.24(A)(5)). This is still one of the most common final-inspection call-outs. Pull the neutral bar screw or strap and verify it before the inspector shows up.

• Main bonding jumper installed and visible (NEC 250.28)
• Grounding electrode system complete, including supplemental where required (NEC 250.53(A)(2))
• Subpanel neutrals isolated, EGC landed on separate bar
• Circuit directory filled out legibly, no "spare" on live circuits (NEC 408.4)
• Arc-flash or available fault current labeling where required (NEC 110.16, 110.24)

Working Clearances and Access

Inspectors check NEC 110.26 clearances on final because trades behind you may have stored materials, installed mechanical equipment, or run ductwork through the working space after your rough-in. Walk every panel location and confirm 30 inches wide, 36 inches deep (Condition 1), and 6.5 feet headroom.

Confirm the dedicated electrical space above panels in NEC 110.26(E) is clear of pipes, ducts, and foreign systems. A sprinkler head directly over a panel is a violation even if the panel itself is perfect.

Field tip: photograph every panel location with a tape measure in frame before the drywall closes up. If an HVAC installer crowds your clearance later, the photo dates the violation and moves the repair cost off your ticket.

Final Documentation

Paper closes the job. Have the load calculation, any available fault current calculation (NEC 110.24), the panel schedules, and the as-built marked up for the inspector's review. If your AHJ uses a local checklist on top of NEC 90.12, print it and work from it directly.

Before you leave site, energize every circuit and operate every device. Dead legs and backwired devices that lose contact under load are both 90.12 failures waiting to surface on the callback. Test, label, cover, document, then call it in.