NEC 2026 Load Calculation Changes: Article 120 vs Article 220

The 2026 edition of the NEC (NFPA 70) introduced the most significant reorganization of load calculation requirements since the code was first published. Article 220, which has governed load calculations for decades, was moved to Article 120 and substantially revised.

This is not just a renumbering — the 2026 NEC changed demand factor values, updated lighting loads, simplified EV charger provisions, and formally recognized Power Control Systems (PCS) as a load management strategy. Every electrician, contractor, and engineer who performs load calculations needs to understand these changes, because the article numbers, table numbers, and values they have memorized are now different.

The 2026 NEC moved load calculations from Article 220 (Part III of the code) to Article 120 (a new location in Part I). Here are the key section mappings:

Any NEC calculator, spreadsheet, or template that references Article 220 section numbers is now out of date for jurisdictions that have adopted the 2026 NEC.

The single biggest numerical change in the 2026 NEC load calculation rules:

NEC 2023 and earlier: General lighting load = 3 VA per square foot (Table 220.12) NEC 2026: General lighting load = 2 VA per square foot (Table 120.12)

This is a 33% reduction in the general lighting load. For a 2,500 sq ft home:

• NEC 2023: 2,500 × 3 = 7,500 VA lighting load
• NEC 2026: 2,500 × 2 = 5,000 VA lighting load
• Difference: 2,500 VA

The reduction reflects the widespread adoption of LED lighting, which uses significantly less power than the incandescent and fluorescent lighting assumed when the 3 VA figure was established. The 2026 NEC also explicitly states this covers outlets up to 20A, simplifying the long-standing debate about whether specific outlet types should be counted separately.

This change affects every residential load calculation — and in some cases, it can reduce the calculated service size from 200A to 150A or even 100A.

The 2026 NEC simplifies EV supply equipment (EVSE) load calculation and formally recognizes Power Control Systems (PCS):

EVSE Load Calculation: A standard Level 2 EV charger is calculated at 7,680 VA (240V, 32A) at 100% demand factor. The 2026 NEC treats EVSE as a standard load in the dwelling unit calculation rather than requiring separate feeder calculations in many cases.

Power Control Systems (Article 750): PCS technology allows a panel to dynamically limit loads to prevent exceeding the service capacity. The 2026 NEC formally allows PCS to be used as a load management strategy, meaning a 200A service can support loads that would otherwise require 300A or 400A — as long as the PCS prevents simultaneous operation.

This is particularly relevant for EV charger installations in older homes: instead of upgrading from a 100A or 150A service to 200A (a $3,000–$8,000 project), a PCS can manage the EV charger load within the existing service capacity.

Section 120.87 — Removed Load Credit (new): The 2026 NEC adds a formal method for crediting removed loads when adding new loads to an existing dwelling. If you remove a 5,000 VA electric range and add a 7,680 VA EV charger, you can credit the removed range against the new load.

If your AHJ has adopted the 2026 NEC (or will soon), every load calculation you perform needs to use the new article numbers, table numbers, and values. This affects:

1. Permit applications — inspectors will expect Article 120 references, not Article 220
2. Load calculation templates — any Excel sheet or paper form referencing Article 220 needs updating
3. Service sizing — the reduced lighting load may change your service size recommendation
4. EV charger installations — simplified provisions and PCS options expand what you can do without a service upgrade
5. Exam preparation — journeyman and master electrician exams will update to reflect the 2026 NEC as jurisdictions adopt it

The transition period will be significant. Different AHJs adopt new NEC editions on different schedules — some jurisdictions are still on NEC 2017 or 2020. You may need to perform calculations under multiple editions simultaneously, depending on the job location.

A modern NEC calculation tool that supports multiple editions and handles the article renumbering automatically eliminates the risk of using the wrong references — the most common mistake during code transitions.