NEC 2023 210.8 GFCI expansion: manufacturer response (deep dive 5)

What Changed in 210.8

NEC 2023 pushed GFCI protection into territory that used to be AFCI-only or unprotected. The big move is 210.8(A) and 210.8(F): all 125-volt through 250-volt receptacles, single-phase, up to 150 volts to ground, 50 amps or less, now require GFCI protection in dwelling units at the listed locations. That pulls in the 240V range, dryer, and the outdoor heat pump disconnect under 210.8(F).

210.8(B) for other than dwellings got the same 250V sweep. Commercial kitchens, rooftop HVAC, indoor damp locations, the list keeps growing. If you wired it in 2020 without GFCI, odds are 2023 wants GFCI on it now.

Pay attention to 210.8(D) for dishwashers, 210.8(E) for crawl space lighting outlets, and the ongoing 210.8(F) outdoor outlet rule that caused most of the noise in the last cycle.

Why Manufacturers Pushed Back

The field issue is nuisance tripping. Inverter-driven heat pumps, variable-speed pool pumps, induction ranges, and modern dryers leak enough high-frequency current through EMI filters to trip a Class A GFCI (4-6 mA trip threshold). The appliance is working correctly. The breaker is working correctly. They just do not coexist.

AHRI and several HVAC manufacturers formally asked for delays and carve-outs during the 2023 cycle. Some states, including Colorado, amended out the 210.8(F) heat pump requirement. Others left it in. Check your AHJ before you quote the job.

Before you pull wire for a heat pump install, call the inspector. Ask specifically whether 210.8(F) is enforced as written or amended. That one phone call will save you a callback and a panel swap.

What the Manufacturers Actually Did

Three tracks emerged from the appliance and breaker side.

• Breaker makers (Square D, Eaton, Siemens) released updated GFCI and dual-function breakers with improved high-frequency filtering and better tolerance for the leakage signatures common to inverter loads. Look for the newer catalog numbers, the older stock on the shelf will still nuisance-trip.
• HVAC makers (Carrier, Trane, Mitsubishi, Daikin) updated install manuals with GFCI compatibility notes, recommended breaker models by manufacturer, and in some cases redesigned the EMI filter stage to reduce capacitive leakage to ground.
• Appliance makers (GE, Whirlpool, Samsung) are slower. Ranges and dryers still trip on some 2023-compliant breakers. Expect another 12-24 months before this settles.

The UL 943 standard itself got revised to address this. UL 943C covers special-purpose GFCIs with different trip characteristics for equipment that legitimately leaks more current. Not every jurisdiction accepts 943C devices for 210.8 compliance. Verify.

Field Troubleshooting When It Trips

You installed it per code. It trips on startup or during defrost. Work the problem in order:

1. Confirm the breaker is a current-production GFCI, not old stock. Check the date code.
2. Megger the branch circuit with the load disconnected. You are looking for actual insulation faults, not equipment leakage. 1 megohm minimum, higher is better.
3. Clamp a true-RMS leakage meter on the hot and neutral together at the breaker. Reading should stay under 4 mA. If it is sitting at 3.5 mA idle, any transient will trip it.
4. Check the equipment ground bond at the unit. A shared neutral or a bootleg ground will trip GFCI every time.
5. Call the equipment manufacturer tech line with the breaker catalog number. They often have a known-good pairing list.

Do not swap the GFCI breaker for a standard breaker as a fix. That is a code violation and a liability problem. If the load genuinely cannot coexist with GFCI, the path is a written AHJ variance, not a field bypass.

What to Tell the Customer

Homeowners do not read NEC. They read their power bill and their Nest app. When the new heat pump trips the breaker three times in January, they call you, not the inspector.

Set expectations at the quote. Explain that 2023 code requires GFCI on the heat pump disconnect, that some combinations of equipment and breaker nuisance-trip, and that resolution may require a breaker swap or a manufacturer firmware update. Put it in writing. Price a return trip into the bid if you are wiring anything with an inverter drive.

Keep a spare current-production GFCI breaker of each common frame size on the truck. Square D QO-GFI, Eaton BR-GFI, Siemens QF. Swapping a 2021 breaker for a 2024 breaker fixes about half the nuisance trip calls without a service charge dispute.

Where This Is Heading

The 2026 cycle is already seeing proposals to refine 210.8. Expect tighter language around what "outlet" means for hardwired equipment, clarification on the 250V threshold, and possibly a formal carve-out or a Class C GFCI pathway for inverter HVAC. Watch the Code Making Panel 2 first draft.

Until then, 2023 is the law in most jurisdictions that have adopted it. Quote it, install it, document the trip events, and keep the manufacturer compatibility notes in the truck binder.