Weekly digest #125: industry news

UL 9540A Updates Hit the Field

UL published revisions to 9540A test methods this quarter, and the ripple is showing up in residential ESS installs. If you're pulling permits for battery storage above 20 kWh aggregate, expect AHJs to start asking for updated thermal runaway documentation tied to the latest test report dates. Older listings are still valid, but inspectors in CA, AZ, and parts of TX are flagging units with pre-2024 reports for additional review.

Practical impact: NEC 706.10 requires the disconnecting means and labeling, but the listing paperwork is what gets you through plan review. Confirm the 9540A report date before ordering, not after the truck arrives.

Tip: Keep a PDF of the current 9540A report on your phone. When the inspector asks, you hand it over in 10 seconds instead of calling the rep.

Copper Pricing and the Aluminum Conversation

Copper closed near $4.85/lb this week, holding the trend that started in late 2025. Service upgrades and feeder runs over 100 ft are where the math is shifting back toward aluminum, especially on multifamily and light commercial. NEC 310.16 and the ampacity tables haven't changed, but the bid sheet has.

If you're new to AL feeders, brush up on terminations. NEC 110.14(A) requires conductors of dissimilar metals not contact unless the device is identified for the purpose. Use AL-rated lugs, an oxide inhibitor where the manufacturer specifies it, and torque to the listed value. Loose AL terminations are still the number one callback driver on these jobs.

• Verify lug listing: AL9CU or CU/AL marked.
• Torque with a calibrated wrench, not by feel.
• Re-torque per manufacturer instructions if specified, typically not required for listed compression connectors but check the cut sheet.
• Document torque values on the inspection card.

GFCI Expansion in the 2026 NEC Cycle

The first published drafts for the 2026 NEC are circulating, and 210.8 continues to expand. Proposed language adds GFCI requirements for additional dwelling unit locations and tightens the commercial kitchen scope. Nothing is adopted yet, and state adoption lags the cycle by 12 to 36 months, but the direction is consistent with every cycle since 2014.

For jobs being designed now that will energize in 2027 or later, talk to the EE about specifying GFCI-protected branch circuits even where current code allows standard breakers. Cheaper to spec it in than to swap panels later when the AHJ catches up.

EV Charging: Load Calc Headaches

Level 2 EVSE installs are still the fastest growing residential category, and the load calculation mistakes are predictable. NEC 625.42 sets the continuous load rule at 125% of the EVSE rating, and 220.57 covers EV calculations specifically. The trap: homeowners with two vehicles want two 48A chargers on a 200A service that's already running an HVAC, range, and dryer.

Energy management systems under 750.30 are the way out. Listed EMS hardware lets you install dual chargers without a service upgrade by load-shedding when the panel approaches capacity. Wallbox, Span, and a few OEM solutions handle this, and the inspector will want the EMS listing documentation alongside the load calc.

Tip: Run the load calc with and without EMS in your proposal. The customer sees the cost delta between a $4,000 EMS install and a $15,000 service upgrade, and the decision makes itself.

Workforce and Licensing Notes

The IBEW and several state contractor associations released updated apprenticeship intake numbers for Q1. Demand for licensed journeymen continues to outpace supply in the Mountain West and Southeast, with wage growth in the 6 to 9% range year over year. If you're running a shop, the calculus on hiring a second-year apprentice versus subbing out small jobs is shifting.

On the licensing side, three states moved on reciprocity agreements this quarter. Check your state board site directly before assuming a license transfers. The NASCLA contractor exam is gaining traction for commercial work, but residential and journeyman tests remain state-specific.

• Verify CE hours due dates, several states moved to a 2-year cycle.
• NFPA 70E updates trigger fresh arc flash training requirements for many employers.
• OSHA 10 and OSHA 30 cards do not expire federally, but some GCs require renewal every 3 to 5 years.

Tool and Material Availability

Lead times on 200A and 400A meter mains are back under 4 weeks at most major distributors after running 12+ weeks through 2024 and most of 2025. Square D QO and Eaton CH stock has normalized. Siemens is still spotty on certain panel configurations, particularly anything with integrated surge.

SPDs themselves are worth a fresh look. NEC 230.67 requires a Type 1 or Type 2 SPD on services supplying dwelling units, and the integrated panel options that were backordered last year are shipping again. Pricing has come down roughly 15% from peak. If you've been bolting on aftermarket Type 2s at the meter, the integrated option is now competitive on labor and material combined.