Household Range Demand Load (NEC Table 220.55 Col. C)
The demand load for household electric ranges by NEC Table 220.55 Column C, with the Note 1 over-12 kW increase.
Example
You enter
- Number of ranges (equal rating) 1
- Each range nameplate (kW) 12
- Service voltage (V) 240
You get
- Column C demand (kW) 8
- Demand load 8
- Demand a 33.333
Details, formula, and sources
One 12 kW range demands 8 kW (not 12), so 33.3 A at 240 V; a 16 kW range adds 5% per kW over 12 (20%) to 9.6 kW / 40 A. Multiple equal-rated ranges read Column C directly. Notes 2-4 (the Columns A/B paths and unequal-rating averaging) and the AHJ govern the other cases.
demand_kw = ColumnC(num_ranges) x (1 + increase); increase = 0.05 x round(nameplate_kw - 12) for ranges over 12 kW, else 0 (Note 1 counts a kW 'or major fraction thereof' -- round-half-up, not ceil); demand_a = demand_kw x 1000 / supply_v. Column C: 1->8, 2->11, 3->14, 4->17, 5->20 kW.
Household electric ranges, wall ovens, and counter-mounted cooking units, NEC 2023 Table 220.55 Column C and Note 1, by name.
NEC is free to read at nfpa.org/freeaccess. This is the common equal-rating Column C path with the Note 1 over-12 kW increase; Notes 2-4 (Columns A/B and unequal-rating averaging) govern the other cases.
Estimate. AHJ and licensed electrician govern. Verify against the NEC edition adopted in your jurisdiction.
Field names used by the API: num_ranges, nameplate_kw, supply_v, col_c_kw, demand_kw, demand_a
- Column C series the bundled 1-through-16-range Column C demand series (1 range -> 8 kW)NEC Table 220.55 Column C
- Note 1 increase a range over 12 kW adds 5% of Column C per kW (or major fraction) above 12 kWNEC Table 220.55 Note 1