Weekly digest #151: common code violations spotted

GFCI gaps in finished basements

Finished basements get treated like living rooms, but the code still calls them out. NEC 210.8(A)(2) requires GFCI protection for all 125-volt through 250-volt receptacles up to 50 amps in basements, finished or not. The "finished basement" carve-out died in the 2008 cycle. If you are still wiring receptacles in a rec room without GFCI, that is a violation waiting for the inspector.

The trap: homeowners hire a remodeler who frames out the space, then a separate electrician extends circuits from the unfinished mechanical room. Receptacles past the wall line still feed from a basement circuit, and they still need GFCI protection. Same goes for the receptacle behind the freezer or sump pump, even if it is dedicated.

Tip: if the panel is in the basement, run the GFCI at the breaker. Saves you chasing nuisance trips behind drywall later.

Bonding bushings on parallel feeders

Parallel sets through concentric or eccentric knockouts are one of the most missed items on commercial gear. NEC 250.92(B) and 250.97 require bonding around concentric/eccentric KOs on circuits over 250 volts to ground, and you need it on every enclosure the conductors pass through, not just the first one.

Crew runs four parallel 500s into a 480Y/277V switchboard, lands them clean, and walks. Inspector pulls the cover off the wireway above and finds standard locknuts on concentric punches. That is a fail, and the fix is ugly because the wireway is already packed.

• Bonding bushings or bonding locknuts on every concentric/eccentric KO above 250V to ground
• Bonding jumper sized per 250.102(C) for the supply side
• Threaded hubs satisfy bonding without a bushing, but only when fully threaded

Working space encroachment

NEC 110.26 is the single most cited violation in commercial finals, and it never goes away. 36 inches deep, 30 inches wide or the width of the equipment (whichever is greater), and 6.5 feet high. Measured from the live parts, not the enclosure face.

Common encroachments: storage shelves on the opposite wall, a water heater installed after the panel went in, an HVAC return duct dropped through the ceiling at 6 feet 2 inches, a wire shelf bolted to the wall next to the panel that cuts into the 30 inch width. The space belongs to the equipment. Nothing else lives there.

Document the clearances on rough-in. Take a tape-measure photo before drywall. When the GC adds a janitor sink in the panel room three weeks later, you have proof the space was clear when you left.

Tamper-resistant receptacle exemptions misapplied

NEC 406.12 requires tamper-resistant receptacles in dwelling units, and the exception list is narrow. The most-abused exception is "more than 5.5 feet above the floor." Crews use it for a receptacle behind a wall-mount TV at 60 inches and call it good. 60 inches is exactly 5 feet. The exception is 66 inches.

The other commonly missed locations: hotel and motel guest rooms (covered by 406.12 since 2014), child care facilities, and waiting rooms in clinics and dental offices. If the receptacle is in a space where children under 7 are reasonably expected, it needs to be TR.

• Dedicated to a single appliance, cord-and-plug connected, located within the appliance space: exempt
• Behind permanently installed equipment: exempt only if not normally accessible
• Receptacle for a fixed-in-place appliance, like a refrigerator: still TR if accessible

EGC not landed on isolated ground receptacles

Isolated ground receptacles still need an equipment grounding conductor. NEC 250.146(D) is clear: the IG conductor is in addition to the EGC, not instead of it. The receptacle yoke bonds to the box through the mounting screws, and the box itself needs to be grounded through the standard EGC path.

Field error: tech pulls a 12/2 with ground for the IG circuit, lands the green-with-yellow-stripe IG conductor on the IG terminal, caps the bare ground, and figures the metal raceway handles the box. If the raceway is not listed as an EGC for that installation, or if there is a section of flex without a parallel EGC, the box has no fault path. Pull the ground in.

Tip: on IG runs in EMT, pull both an IG conductor and a green EGC. Two greens, one with a yellow stripe. Saves the argument with the inspector.

Receptacle spacing on islands and peninsulas

The 2023 NEC changed island and peninsula receptacles, and a lot of crews are still wiring to the 2020 rules. Under 210.52(C)(2), receptacles are no longer required on the island or peninsula itself, but if you install one, GFCI protection per 210.8(A)(6) still applies, and the location rules in 406.5(E) and (G) restrict face-up installations.

What this means in the field: you can serve island countertop loads from a nearby wall receptacle or a pop-up unit in the countertop, as long as the pop-up is listed for the use and not face-up when closed. The old "receptacle in the side of the cabinet, 12 inches below the overhang" answer is still legal, but no longer the only option.

1. Confirm which code cycle the AHJ has adopted before quoting the job
2. If installing a pop-up, verify the listing covers countertop installation
3. GFCI is still required for any 125V through 250V receptacle up to 50A serving the kitchen counter