NEC 2026 Load Calculations: What Changed for Electricians

Short answer: the 2026 National Electrical Code rewrites the load-calculation article. Article 220 is now Article 120. The general lighting load for dwelling services and feeders drops from 3 VA per square foot to 2 VA per square foot. Branch-circuit counts still use 3 VA per square foot. The 125 percent continuous-load multiplier no longer belongs inside the load calculation itself. EV chargers use the actual nameplate rating instead of defaulting to 7,200 watts. Existing dwellings get new demand factors for retrofits, including 80 percent for new EVSE. None of this is in effect until your authority having jurisdiction adopts the 2026 edition, but it is the direction the code is moving.

Article 220 is now Article 120

The first thing that will trip you up is the numbering. The 2026 NEC moved Branch-Circuit, Feeder, and Service Load Calculations from Article 220 to new Article 120. Nearly every section number you memorized has changed.

For example, dwelling unit general lighting moved from 220.41 to 120.41. Existing dwelling unit load calculations moved from 220.83 to 120.83. EVSE load calculations moved to 120.57. If your estimating software, permit forms, or cheat sheets still cite Article 220, they are now out of date.

Adoption timing is still local. States and cities adopt NEC editions on their own schedules, so the 2026 rules do not apply everywhere on the same date. Confirm which edition your AHJ is enforcing before you quote a 2026-specific number. The rest of this article assumes the 2026 edition is the one in force.

Dwelling unit service and feeder load: 2 VA per square foot

Under Section 120.41, the minimum general lighting and general-use receptacle load for dwelling units is now 2 VA per square foot, down from 3 VA per square foot. The change is based on measured load data, including Lawrence Berkeley National Laboratory monitoring of occupied dwellings, plus the shift to LED and fluorescent lighting driven by federal lamp efficiency rules.

On a 5,000 square foot house, the old calculation produced 15,000 VA. The 2026 calculation produces 10,000 VA. At 240 volts single-phase, that is the difference between 62.5 amps and about 41.7 amps in the general lighting portion of the service calculation. That can change whether a 200-amp service is adequate or whether the plan checker wants to see a larger service and feeder.

The lower number is for service and feeder sizing, not for deciding how many branch circuits the house needs.

Branch circuits still use 3 VA per square foot: Section 120.13

New Section 120.13 requires a separate branch-circuit load calculation for dwelling units, and it keeps the old 3 VA per square foot value. That calculation determines the minimum number of general lighting branch circuits. It does not feed into the total dwelling load.

The reason for the split is straightforward. The 2 VA per square foot service load reflects real-world demand, but it could also be used to justify fewer branch circuits. Fewer circuits means more receptacles and lights per circuit, which is where overload complaints come from. Section 120.13 prevents that by keeping branch-circuit counts at the old level.

For the same 5,000 square foot house, the branch-circuit calculation is 15,000 VA. Divided by 120 volts, that is 125 amps. That works out to at least nine 15-amp circuits or seven 20-amp circuits, before you add the required small-appliance, laundry, bathroom, and garage circuits from Section 210.11(C).

When you are checking a plan or a quote, make sure the service load and the branch-circuit count are being pulled from the right sections. Using 2 VA per square foot for both is a common first mistake under the 2026 NEC.

Continuous loads: the 125 percent multiplier leaves the load calculation

Section 120.5(E) states that load calculations shall not require continuous loads to be calculated at 125 percent. This is one of the most misunderstood changes in the new code, so it is worth reading carefully.

The 125 percent multiplier still applies to conductor sizing and overcurrent protection when you are selecting wire and breakers under Articles 210, 215, and 220. It does not disappear from the code. What changed is that the load calculation itself no longer inflates continuous loads by 25 percent. The calculated load is the calculated load. The sizing rules handle the safety margin separately.

For your shop, that means a load calculation spreadsheet built for the 2023 NEC may be overcounting continuous loads once you switch to the 2026 edition. Update the sheet so the 125 percent multiplier lives in the conductor and breaker sizing steps, not in the demand load total.

EV chargers: nameplate rating wins over the 7,200 W default

Section 120.57 changes how electric vehicle supply equipment is counted in feeder and service calculations. In the 2023 NEC, the EVSE load was the larger of the equipment nameplate rating or 7,200 watts. The 2026 NEC uses the nameplate rating if it is known, and falls back to 7,200 watts only when the nameplate rating is unknown.

That matters because many Level 1 and Level 2 chargers operate below 7,200 watts. A 32-amp, 240-volt charger is roughly 7,680 watts, but a 16-amp unit is about 3,840 watts. Under the 2026 rules, you can use the lower number when it is supported by the equipment documentation.

The 2026 NEC also clarifies that EVSE loads are calculated at 100 percent, not 125 percent. If you are using the optional dwelling-unit calculation in Section 120.82, new EVSE in a new dwelling unit is added at 100 percent demand factor. In an existing dwelling unit, new EVSE gets an 80 percent demand factor under Section 120.83.

The 80 percent figure came from First Revision FR 8188, based on Lawrence Berkeley National Laboratory sub-metering data showing how EV chargers actually operate in existing homes. It is double the demand factor that would have applied to EVSE under the older tables, where EVSE was not explicitly listed.

Before you quote an EV charger install, get the actual nameplate rating and know whether the job is a new dwelling, existing dwelling, or service upgrade. The same charger can produce a different calculated load depending on which section governs. See what to ask before you book an EV charger install for the intake questions that still apply.

Existing dwellings get simpler retrofit math

Section 120.83 replaces the older multi-table approach for existing dwelling units with a single, simplified calculation. The goal is to make it easier to determine whether an existing service or feeder can handle new loads without a full upgrade.

Key pieces for retrofit work:

• Removed loads can be subtracted when you are evaluating whether new loads will fit.
• New EVSE gets an 80 percent demand factor.
• New central electric resistance heating gets an 80 percent demand factor.
• Other new loads generally get a 50 percent demand factor.
• There is an 8 kVA threshold: if the existing load multiplied by 125 percent is less than 8 kVA, the change in load is treated at 100 percent until that 8 kVA point is reached. Everything above it uses the new-load percentages.

This is the section that keeps more panel upgrades from becoming service upgrades. If a customer is adding a heat pump, an EV charger, or a kitchen appliance, the 2026 math may show the existing service has room where the 2023 math did not. That is a real difference in the bid, but only if your calculation follows the current adopted code.

For panel upgrade calls specifically, the same intake discipline still applies. See what to ask on a panel upgrade call before you are standing in front of a full panel.

Power control systems are now in the load calculation

Section 120.7 formalizes Power Control Systems, formerly treated under energy management system rules. The idea is the same: if a system guarantees that loads will not all run at once, you can use the controlled maximum load in your calculation instead of the sum of the individual nameplate ratings.

For EV charging, Section 625.42 already allows a reduced load when the system includes equipment that limits the load. The terminology has shifted from energy management system to power control system, and the documentation requirements have tightened. You need to know the actual setpoint the system will enforce and have manufacturer documentation to back it up.

On multifamily or commercial jobs with multiple EV chargers, power control systems can be the difference between a viable project and a service upgrade. But the calculated load is only as defensible as the documentation behind it. Get the setpoint and the manufacturer cut sheet in writing before you put it in the permit package.

What to do about it

• Confirm the adopted edition before you quote. A jurisdiction still on the 2023 or 2020 NEC does not care what Article 120 says. Build a process to check the AHJ edition on every job.
• Update your load calculation spreadsheet or software. Move the 125 percent continuous-load multiplier out of the load total and into the conductor and breaker sizing steps.
• Train the office on the new section numbers. Plan checkers, estimators, and permit expediters all need to stop citing Article 220 for load calculations.
• Get the EVSE nameplate before pricing. Do not default to 7,200 watts if the actual charger draws less.
• Ask about power control systems early. On jobs with multiple chargers or heavy retrofits, a controlled load can change the service size. Verify the setpoint and documentation before you rely on it.
• Keep branch-circuit counts separate from service sizing. Use 2 VA per square foot for feeders and services, 3 VA per square foot for the branch-circuit count.

The 2026 NEC does not rewrite electrical theory, but it does change the numbers you will put on permits and quotes. The shops that update their estimating and intake processes now will avoid the change-order conversations later.