NEC 2026 Load Calculations (Massachusetts)

Massachusetts journeyman candidates must be fluent in dwelling load calculations, and the NEC 2026 changes rules that stood for decades. The first thing to master is where the rules live: every branch-circuit, feeder, and service load calculation moved out of Article 220 in Chapter 2 into Article 120 in Chapter 1 (General Requirements). The single most tested change is the unit-load reduction: dwelling general lighting drops from 3 VA/sq ft to 2 VA/sq ft (120.41). This chapter builds the full picture: the two per-square-foot values, branch-circuit counting, demand factors, the optional method, and continuous loads.

Learning Objectives

Locate the load calculation rules in NEC 2026 Article 120 (Chapter 1) and convert former 220-series references to their new numbers.

Apply the 2 VA/sq ft dwelling general lighting and receptacle unit load of Section 120.41 in standard-method calculations.

Explain why Section 120.13 still requires 3 VA/sq ft when counting the minimum number of general-purpose branch circuits.

Compute the minimum number of 15 A and 20 A, 120 V general lighting branch circuits, rounding partial results up.

Assemble dwelling calculation components: small-appliance and laundry allowances, fixed appliances, ranges.

Apply Table 120.55 range demand and the Section 120.83 optional method (first 8 kVA at 100%, remainder at 40%).

Treat continuous loads correctly under Section 120.5(E), separating load calculation from conductor and OCPD sizing.

1.1 Where Load Calculations Live in the NEC 2026

Load calculations for branch circuits, feeders, and services lived in Article 220 in Chapter 2 for decades. The NEC 2026 eliminates that article and moves the calculation rules into Article 120 in Chapter 1 — General Requirements. The move is structural, but several values changed along the way — most importantly the dwelling lighting unit load.

1.1.1 Old-to-new reference map

Subject	NEC 2023	NEC 2026
Dwelling general lighting and general-use receptacle unit load	220.41 (dwelling value under former 220.12)	120.41
Unit load for counting dwelling branch circuits	220.12-based calculation	120.13 (3 VA/sq ft)
Cooking appliance demand table	Table 220.55	Table 120.55
Optional dwelling unit load method	220.83	120.83
Continuous-load treatment	125% built into calculations	120.5(E) — load calcs use actual load

Not everything moved: the conductor and overcurrent-device sizing rules of the branch-circuit and feeder articles (e.g., 210.19 and 215.2) stay where they are and still handle continuous loads at 125% where applicable (Section 1.9), and the minimum-number-of-branch-circuits requirement still comes from 210.11(A). Exam questions deliberately include the old references — "Article 220 in Chapter 2," 220.83, 220.41 — as incorrect options. On the Massachusetts exam, "Article 120 in Chapter 1" is the location answer.

1.2 Two Unit Loads: 2 VA/sq ft and 3 VA/sq ft

The most tested concept in the NEC 2026 dwelling calculation is that two different per-square-foot values exist, and each has its own job. Confusing them produces the classic wrong answer.

Value	Where it comes from	What it is used for
2 VA/sq ft	Section 120.41	General lighting and general-use receptacle load in standard-method service/feeder calculations (and the starting load for the optional method)
3 VA/sq ft	Section 120.13	Determining the minimum number of general-purpose branch circuits

1.2.1 Why the lighting value dropped to 2 VA

NEC 2026 drops the dwelling lighting unit load from 3 VA to 2 VA/sq ft because LED and other high-efficacy lighting draws far less power per square foot than the incandescent-era loads the 3 VA figure was designed to serve. Section 120.41 (formerly 220.41) anchors the calculation at the lower value.

1.2.2 Why the circuit-counting value stayed at 3 VA

The load reduction must not quietly reduce the number of circuits a dwelling is required to have: circuit count is about coverage, not service diversity. Section 120.13 therefore keeps dwelling branch-circuit loads at 3 VA/sq ft when counting circuits — intentionally separate from the 2 VA/sq ft value in 120.41. Ask for the lighting load? Use 2 VA/sq ft. Ask how many branch circuits? Use 3 VA/sq ft.

1.3 The General Lighting and Receptacle Load (120.41)

Section 120.41 sets the dwelling general lighting and general-use receptacle load at 2 VA per square foot. In the standard method this is the starting figure of the service and feeder calculation, and it is usually tested before any demand factor is applied:

General lighting and receptacle load = floor area (sq ft) × 2 VA/sq ft

1.3.1 Worked examples

Floor area	NEC 2026 load (2 VA/sq ft)	NEC 2023 comparison (3 VA/sq ft)
2,000 sq ft	4,000 VA	6,000 VA
2,400 sq ft	4,800 VA	7,200 VA
3,000 sq ft	6,000 VA	9,000 VA

Example 1 — 2,000 sq ft. Load = 2,000 × 2 = 4,000 VA before demand factors. Under NEC 2023 the same house produced 6,000 VA — exactly the obsolete-value distractor.

Example 2 — 2,400 sq ft. 2,400 × 2 = 4,800 VA (the old 3 VA/sq ft answer, 7,200 VA, is a wrong option).

Example 3 — 3,000 sq ft. 3,000 × 2 = 6,000 VA before demand factors (9,000 VA under prior editions).

1.3.2 Notes

Multiply the stated living area only — no garages or open porches. "Before demand factors" means the raw area × 2 VA product, not the post-demand value.

1.4 Small-Appliance and Laundry Loads in the Standard Method

The 120.41 lighting figure is not the only receptacle-type load in a dwelling calculation. The standard method adds allowances for the required small-appliance and laundry branch circuits before demand factors:

Component	Allowance
General lighting and general-use receptacles (120.41)	floor area × 2 VA
Small-appliance circuits (2 × 20 A)	2 × 1,500 VA = 3,000 VA
Laundry circuit (1 × 20 A)	1,500 VA

Each required small-appliance branch circuit and the laundry branch circuit contributes a 1,500 VA allowance; the group passes through the demand-factor step together. On this chapter's questions the tested figure is the 120.41 lighting load itself, but a full standard-method problem adds these allowances before demand factors.

1.5 Minimum Number of General-Purpose Branch Circuits (120.13)

A dwelling's general-purpose branch circuits are counted so the dwelling has enough of them. The count is a load-based rule:

41.Compute the branch-circuit load at 3 VA/sq ft (120.13).

42.Divide by the capacity of the circuit to be used.

43.Round any fraction up — a partial circuit still requires a full circuit.

1.5.1 Circuit capacities

15 A, 120 V lighting circuit: 15 × 120 = 1,800 VA per circuit.

20 A, 120 V lighting circuit: 20 × 120 = 2,400 VA per circuit.

1.5.2 Worked examples

Example 1 — 1,500 sq ft with 15 A circuits. Count load = 1,500 × 3 VA = 4,500 VA. Each 15 A, 120 V circuit supplies 1,800 VA, so 4,500 ÷ 1,800 = 2.5 — rounded up, the minimum is 3 circuits.

Example 2 — 5,500 VA lighting load with 15 A circuits. 5,500 ÷ 1,800 = 3.06 → 4 circuits (210.11(A), Article 120 method). Do not round down.

Example 3 — 3,000 sq ft with 20 A circuits. Count load = 3,000 × 3 VA = 9,000 VA; 9,000 ÷ 2,400 = 3.75 → 4 circuits — against a service load of only 6,000 VA at 2 VA/sq ft (120.41).

1.6 Demand Factors and the Shape of the Standard Method

A demand factor is a permitted reduction applied to a connected load because not all of it draws at once. The standard method groups a dwelling's loads and applies demand to each group:

General lighting and receptacle-type group (2 VA/sq ft lighting plus small-appliance and laundry allowances): the first portion at 100%, the middle portion at a reduced percentage, the remainder lower still — per the Article 120 demand rules. The questions in this chapter stop before this step; "minimum general lighting load before demand factors" asks for the 2 VA/sq ft product, period.

Fixed appliances: four or more fixed appliances (excluding cooking and space-heating equipment) may be taken at a reduced percentage of the nameplate total.

Ranges and cooking appliances use Table 120.55 rather than nameplate (Section 1.7).

1.7 Cooking Appliances and Table 120.55

A household electric range is not added to the feeder load at nameplate: its elements are thermostatically controlled and never all draw full power for long. NEC Table 120.55 (formerly Table 220.55) supplies the permitted demand. The table moved into Article 120 with the 2026 reorganization, but its values are unchanged.

The single-range rule tested: for one range rated not over 12 kW, the table permits a feeder demand of 8 kW.

Example. A household electric range rated 12 kW is served by a 120/240-volt branch circuit. The minimum feeder demand is 8 kW — not 12 kW (nameplate) and not 10 kW. Ranges above 12 kW step through the table's additional columns, and the table also covers multiple ranges, but 8 kW for a single range not over 12 kW is the anchor. Note that the table gives a feeder/service demand for the calculation; the branch circuit feeding the range is a separate sizing exercise.

1.8 The Optional Method for Dwelling Units (120.83)

NEC 2026 Section 120.83 (formerly 220.83) permits an optional method for dwelling units that is often simpler — and can yield a lower computed load — than the standard method.

1.8.1 When it applies

The optional method is permitted for a one-family dwelling when the total connected load is served by a single 120/240-volt or 208Y/120-volt feeder or service. If loads are split across services, or the voltage system differs, the method does not apply. (There is no electric-heat-only or mobile-home-only restriction — those are distractors.)

1.8.2 The calculation

67.Add the total connected load — general lighting at the 120.41 value, small-appliance and laundry allowances, and every appliance at nameplate.

68.Take the first 8 kVA at 100%.

69.Take the remainder at 40%.

70.Add the two pieces.

The 8 kVA starting block is new: NEC 2023 started at 10 kVA; NEC 2026 Section 120.83 starts at 8 kVA. An answer offering "the first 10 kVA at 100%" is the pre-2026 value.

1.8.3 Worked example

A 2,000 sq ft one-family dwelling served by a single 120/240 V feeder: general lighting at 2 VA/sq ft (2,000 × 2 = 4,000 VA), two small-appliance circuits (3,000 VA), laundry (1,500 VA), and a 12 kW range at nameplate (12,000 VA) — total connected load 20,500 VA.

First 8 kVA at 100%: 8,000 VA.

Remainder: 20,500 − 8,000 = 12,500 VA at 40% = 5,000 VA.

Total computed load: 8,000 + 5,000 = 13,000 VA, or 13,000 ÷ 240 ≈ 54 A at 240 volts.

The optional method counts the 12 kW range at nameplate, then applies the heavy 40% factor to everything above 8 kVA — a realistic feeder demand without every standard-method table.

1.9 Continuous Loads and Section 120.5(E)

A continuous load is one where the maximum current is expected to continue for 3 hours or more — typically lighting, some motors, and long-running heating loads. Older editions figured continuous loads at 125% inside the calculation itself. NEC 2026 changes that:

Load calculations use the actual load. Section 120.5(E) removes the 125% continuous-load adder from load calculations.

Conductor and overcurrent-device sizing still account for continuous load at 125% where applicable — through the sizing rules of the branch-circuit and feeder articles (e.g., 210.19 and 215.2) and the matching overcurrent-device rules.

The 125% requirement did not disappear — it moved into the sizing step. "Continuous loads are always calculated at 200%" and "continuous loads are ignored" are both wrong; the load calculation carries the actual load and the sizing rules absorb the 125%.

Sizing example. A feeder supplies a 30 A continuous load: the load calculation shows 30 A, but the feeder conductors need an ampacity of at least 30 × 1.25 = 37.5 A, with the overcurrent device rated accordingly.

Code Navigation

You need…	NEC 2023 (old)	NEC 2026 (current)
Dwelling general lighting & receptacle unit load (2 VA/sq ft)	220.41 / 220.12	120.41
Unit load for counting dwelling branch circuits (3 VA/sq ft)	220.12-based calculation	120.13
Continuous-load treatment in load calculations	125% inside the calculation	120.5(E)
Range/cooking demand table	Table 220.55	Table 120.55
Dwelling optional method	220.83	120.83
Minimum number of branch circuits	210.11(A)	210.11(A) (unchanged)
Conductor sizing with continuous loads	210.19 / 215.2	210.19 / 215.2 (unchanged)

On the Massachusetts exam, calculation rules live in Article 120, Chapter 1 — a 220-series number in an answer choice is the pre-2026 reference. References such as 210.11(A), 210.19, and 215.2 did not move.

Common Exam Traps

Using 3 VA/sq ft for the service load. 120.41 is 2 VA/sq ft; 3 VA/sq ft belongs only to the 120.13 circuit count. A 2,400 sq ft home is 4,800 VA — 7,200 VA is the 2023 answer.

Using 2 VA/sq ft to count circuits. Minimum branch-circuit count stays at 3 VA/sq ft; the 2026 load reduction intentionally does not cut circuit count.

Rounding circuit counts down. 4,500 ÷ 1,800 = 2.5 → 3 circuits; 5,500 ÷ 1,800 = 3.06 → 4. Any remainder demands one more full circuit.

Adding a range at nameplate in the standard method. One range not over 12 kW = 8 kW demand (Table 120.55); 12 kW and 10 kW are both wrong.

Using the old 10 kVA block. 120.83 takes the first 8 kVA at 100% in NEC 2026.

Applying 125% inside a load calculation. Under 120.5(E) the calculation uses the actual load; 125% lives in conductor and OCPD sizing (210.19, 215.2).

Accepting "Article 220, Chapter 2" as the location. Load calculations are in Article 120, Chapter 1.

Practical Field Points

The 2 VA/sq ft reduction is a real design change: LED lighting draws roughly a quarter of the power of incandescent for the same light, so services sized on legacy assumptions carried dead capacity.

Even though the computed lighting load fell, the number of branch circuits did not — circuit count is about coverage, not arithmetic.

In real feeder and service calculations, lighting and receptacle loads take their demand curve, four or more fixed appliances may take the reduced factor, and ranges use Table 120.55 — the 120.83 optional method is the shortcut the field actually uses for most one-family dwellings.

Continuous loads still govern conductor and breaker sizing: a long-burning load needs conductors and overcurrent devices rated for 125% of the continuous current, even though the calculation sheet shows the plain load.

Summary

NEC 2026 moved all load calculation rules into Article 120, Chapter 1; Article 220 is gone.

General lighting and receptacle load: 2 VA/sq ft (120.41) — 2,000 sq ft = 4,000 VA; 2,400 sq ft = 4,800 VA; 3,000 sq ft = 6,000 VA.

Branch-circuit count: 3 VA/sq ft (120.13) — kept so the lower unit load does not cut circuit counts.

15 A, 120 V circuit = 1,800 VA; 20 A, 120 V circuit = 2,400 VA; divide and round up.

Small-appliance circuits add 1,500 VA each; laundry adds 1,500 VA — before demand factors.

One range not over 12 kW: 8 kW demand (Table 120.55).

Optional method (120.83): first 8 kVA at 100%, remainder at 40%.

Continuous loads: actual load in calculations (120.5(E)); 125% in conductor and OCPD sizing (210.19, 215.2).

NEC 2026 Load Calculations (Massachusetts)