Weekly digest #122: inspector trends

What inspectors are flagging this week

Field reports from the last two weeks show inspectors zeroing in on a handful of repeat issues. Nothing exotic, just the fundamentals that keep tripping crews up on rough-in and final. If your jobs run through AHJs in the Midwest or Mountain West, expect extra attention on GFCI placement, working clearances, and bonding at outdoor equipment.

The pattern is consistent across residential and light commercial. Inspectors are slowing down at service equipment, island receptacles, and anywhere a panel shares a wall with an exterior disconnect. Read the job before you rough it. A five minute walkthrough with the print saves a red tag.

GFCI expansion is still catching crews off guard

The 2023 NEC broadened GFCI requirements under 210.8(A) and 210.8(F), and inspectors are now writing corrections on installations that would have passed two cycles ago. The big ones: dwelling unit basements (finished or unfinished), laundry areas, and outdoor outlets serving HVAC equipment. 210.8(F) specifically pulled outdoor dwelling unit outlets under GFCI protection, including the one feeding the condenser.

If your AHJ is still on the 2020 cycle, confirm before you buy devices. Some jurisdictions amended out 210.8(F) for heat pumps and mini splits due to nuisance tripping complaints. Others did not. Call the inspector, do not assume.

• NEC 210.8(A)(5): basements, all receptacles
• NEC 210.8(A)(10): laundry areas
• NEC 210.8(F): outdoor outlets for dwelling units
• NEC 210.8(B): commercial GFCI zones expanded to include indoor wet locations

Tip from a St. Louis journeyman: "I dedicate one 20A GFCI breaker to the HVAC condenser and nothing else. If it trips, the homeowner knows exactly what to reset, and I do not get a callback for a tripped fridge."

Working clearances at service equipment

110.26 is the most cited article in service inspections right now. The 30 inch wide, 36 inch deep, 6.5 foot tall clear space in front of panels is getting measured with a tape, not eyeballed. Dryer vents, water heaters, and shelving are the usual offenders. On remodels, check the existing mechanical room before you relocate a subpanel into it.

A newer flag: dedicated equipment space above the panel per 110.26(E). Inspectors are calling out sprinkler piping, low voltage trays, and foreign systems running through the 6 foot zone above the enclosure. If you have to route through it, you need a 6 inch drip barrier or the piping has to be dedicated to the electrical equipment.

Bonding and grounding at outdoor disconnects

With more AHJs enforcing 230.85, every new dwelling service needs an emergency disconnect within sight. That means more outdoor enclosures, and inspectors are finding bonding errors in about a third of them. The neutral to ground bond belongs at the service disconnect only. If your outdoor disconnect is the service disconnect, bond there and treat the indoor panel as a subpanel with isolated neutrals and a separate equipment grounding conductor.

Common mistakes to catch before the inspector does:

1. Neutral bonded at both the outdoor disconnect and the indoor panel
2. Missing equipment grounding conductor between outdoor and indoor enclosures (you cannot rely on the neutral)
3. Grounding electrode conductor landed at the indoor panel instead of the service disconnect per 250.24(A)
4. Missing bonding bushing on metal conduit transitioning from outdoor to indoor

250.92 and 250.102 cover the bonding requirements. If the run between disconnect and panel is PVC, you still need the EGC sized per 250.122.

Box fill and conductor counts

Box fill violations under 314.16 are up this cycle, driven by smart switches and combination devices. A single gang box with a smart dimmer, a bundle of neutrals, and three #12 THHN circuits is usually over the limit. Inspectors are pulling devices to count conductors.

Quick refresher on the counting rules from 314.16(B):

• Each conductor passing through or terminating in the box: one count
• All equipment grounding conductors together: one count (largest size)
• Each yoke or strap with a device: two counts (at largest conductor connected)
• Cable clamps inside the box: one count (largest conductor)
• One or more internal fittings (hickeys, studs): one count each

For #12 conductors that is 2.25 cubic inches per count. A standard 18 cubic inch single gang maxes out at 8 counts. A smart switch with a neutral pigtail eats four of those on its own.

Tip: if you are running smart devices, spec 22.5 or 25 cubic inch boxes at the rough in. The upcharge is pennies and it prevents a tear out when the homeowner decides they want Lutron everywhere.

What to carry this week

Based on the correction patterns above, three things belong on the truck if they are not already there: a 25 foot tape for clearance checks, extra deep boxes for smart device retrofits, and a handful of GFCI breakers rated for HVAC inductive loads. The HVAC rated breakers cost more but they stop the nuisance trip callbacks cold.

Keep a printed copy of 210.8, 110.26, and 250.24 in the truck binder. When an inspector questions an install, reading the article back to them resolves 90 percent of disputes on the spot. The other 10 percent are judgment calls, and those are worth a phone call to the AHJ before you start the fix.