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Table 220.84 Optional Calculations — Demand Factors for Three or More Multifamily Dwelling Units
Number of Dwelling Units Demand Factor (%)
3—5 45
6—7 44
8—10 43
11 42
12—13 41
14—15 40
16—17 39
18—20 38
21 37
22—23 36
24—25 35
26—27 34
28—30 33
31 32
32—33 31
34—36 30
37—38 29
39—42 28
43—45 27
46—50 26
51—55 25
56—61 24
62 and over 23
(A) Feeder or Service Load
It shall be permissible to calculate the load of a feeder or service that supplies three or more dwelling units of a multifamily dwelling in accordance with Table 220.84 instead of Part III of this article if all the following conditions are met:
  1. No dwelling unit is supplied by more than one feeder.
  2. Each dwelling unit is equipped with electric cooking equipment.
    Exception: When the calculated load for multifamily dwellings without electric cooking in Part III of this article exceeds that calculated under Part IV for the identical load plus electric cooking (based on 8 kW per unit), the lesser of the two loads shall be permitted to be used.
  3. Each dwelling unit is equipped with either electric space-heating or air conditioning, or both. Feeders and service conductors whose calculated load is determined by this optional calculation shall be permitted to have the neutral load determined by 220.61.
(B) House Loads
House loads shall be calculated in accordance with Part III of this article and shall be in addition to the dwelling unit loads calculated in accordance with Table 220.84.
(C) Calculated Loads
The calculated load to which the demand factors of Table 220.84 apply shall include the following:
  1. 33 volt-amperes/m2 or 3 volt-amperes/ft2 for general lighting and general-use receptacles
  2. 1500 volt-amperes for each 2-wire, 20-ampere small-appliance branch circuit and each laundry branch circuit covered in 210.11(C)(1) and (C)(2)
  3. The nameplate rating of the following:
    1. All appliances that are fastened in place, permanently connected, or located to be on a specific circuit
    2. Ranges, wall-mounted ovens, counter-mounted cooking units
    3. Clothes dryers that are not connected to the laundry branch circuit specified in item (2)
    4. Water heaters
  4. The nameplate ampere or kVA rating of all permanently connected motors not included in item (3)
  5. The larger of the air-conditioning load or the fixed electric space-heating load

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