BRANCH-CIRCUIT, FEEDER, AND SERVICE CALCS 70-55

Table 220-13. Demand Factors for Nondwelling Receptacle Loads Portion of Receptacle Load Demand to which Demand Factor Factor Applies (volt-amperes) Percent First 10 kVA or less 100 Remainder over 10 kVA at 50 220-14. Motors. Motor loads shall be computed in accordance with Sections 430-24, 430-25, and 430-26. 220-15. Fixed Electric Space Heating. Fixed electric space heating loads shall be computed at 100 percent of the total connected load; however, in no case shall a feeder load current rating be less than the rating of the largest branch circuit supplied. Exception No. 1: Where reduced loading of the conductors results from units operating on duty-cycle, intermittently, or from all units not operating at one time, the authority having jurisdiction may grant permission for feeder conductors to have an ampacity less than 100 percent, provided the conductors have an ampacity for the load so determined. Exception No. 2: The use of the optional calculations in Sections 220-30 and 220-31 shall be permitted for fixed electric space heating loads in a dwelling unit. In a multifamily dwelling, the use of the optional calculation in Section 220-32 shall be permitted. 220-16. Small Appliance and Laundry Loads - Dwelling Unit. (a) Small Appliance Circuit Load. In each dwelling unit, the feeder load shall be computed at 1500 volt-amperes for each 2-wire small appliance branch circuit required by Section 220-4(b) for small appliances supplied by 15- or 20-ampere receptacles on 20-ampere branch circuits in the kitchen, pantry, dining room, and breakfast room. Where the load is subdivided through two or more feeders, the computed load for each shall include not less than 1500 volt-amperes for each 2-wire branch circuit for small appliances. These loads shall be permitted to be included with the general lighting load and subjected to the demand factors permitted in Table 220-11 for the general lighting load. (b) Laundry Circuit Load. A feeder load of not less than 1500 voltamperes shall be included for each 2-wire laundry branch circuit installed as required by Section 220-4(c). It shall be permissible to include this load with the general lighting load and subject it to the demand factors provided in Section 220-11. 220-17. Appliance Load - Dwelling Unit(s). It shall be permissible to apply a demand factor of 75 percent to the nameplate-rating load of four or more appliances fastened in place that are served by the same feeder in a one-family, two-family, or multifamily dwelling. 70-56 NATIONAL ELECTRICAL CODE Exception: This demand factor shall not be applied to electric ranges, clothes dryers, space heating equipment, or air-conditioning equipment. 220-18. Electric Clothes Dryers - Dwelling Unit(s). The load for household electric clothes dryers in a dwelling unit(s) shall be 5000 watts (voltamperes) or the nameplate rating, whichever is larger, for each dryer served. The use of the demand factors in Table 220-18 shall be permitted. Table 220-18. Demand Factors for Household Electric Clothes Dryers Number of Demand Factor Dryers Percent 1 100 2 100 3 100 4 100 5 80 6 70 7 65 8 60 9 55 10 50 11-13 45 14-19 40 20-24 35 25-29 32.5 30-34 30 35-39 27.5 40 and over 25 220-19. Electric Ranges and Other Cooking Appliances - Dwelling Unit(s). The feeder demand load for household electric ranges, wallmounted ovens, counter-mounted cooking units, and other household cooking appliances individually rated in excess of 13/4 kW shall be permitted to be computed in accordance with Table 220-19. Where two or more single-phase ranges are supplied by a 3-phase, 4-wire feeder, the total load shall be computed on the basis of twice the maximum number connected between any two phases. kVA shall be considered equivalent to kW for loads computed under this section. (FPN): See Example 5(a), Chapter 9. 220-20. Kitchen Equipment - Other than Dwelling Unit(s). It shall be permissible to compute the load for commercial electric cooking equipment, dishwasher booster heaters, water heaters, and other kitchen equipment in accordance with Table 220-20. These demand factors shall be applied to all equipment that has either thermostatic control or intermittent use as kitchen equipment. They shall not apply to space heating, ventilating, or air-conditioning equipment. However, in no case shall the feeder demand be less than the sum of the largest two kitchen equipment loads.