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220.32 Optional Calculation — Multifamily Dwelling.
(A) Feeder or Service Load. It shall be permissible to compute the load of a feeder or service that supplies more than two dwelling units of a multifamily dwelling in accordance with Table 220.32 instead of Part II of this article where 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.
The method of load calculation under 220.32 is optional and applies only where one service or feeder supplies the entire load of a dwelling unit. If all the stated conditions prevail, the optional calculations in 220.32 may be used instead of those in Part II of Article 220.
Exception: When the computed load for multifamily dwellings without electric cooking in Part II of this article exceeds that computed under Part III 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.
Section 220.32(A)(2) requires that each dwelling unit be equipped with electric cooking equipment in order to use the load calculation method found in 220.32(A). The exception to 220.32(A)(2) permits load calculation for dwelling units that do not have electric cooking equipment by calculating a simulated electric cooking equipment load of 8 kW per unit and selecting the lesser of the two loads.
(3) Each dwelling unit is equipped with either electric space heating, air conditioning, or both. Feeders and service conductors whose demand load is determined by this optional calculation shall be permitted to have the neutral load determined by 220.22.
(B) House Loads. House loads shall be computed in accordance with Part II of this article and shall be in addition to the dwelling unit loads computed in accordance with Table 220.32.
Table 220.32 Optional Calculations — Demand Factors for Three or More Multifamily Dwelling Units
Number of Dwelling Units Demand Factor (Percent)
(C) Connected Loads. The computed load to which the demand factors of Table 220.32 apply shall include the following:
(1) 1500 volt-amperes for each 2-wire, 20-ampere small-appliance branch circuit and each laundry branch circuit specified in 220.16.
(2) 33 volt-amperes/m2 or 3 volt-amperes/ft2 for general lighting and general-use receptacles.
(3) The nameplate rating of all appliances that are fastened in place, permanently connected or located to be on a specific circuit, ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, water heaters, and space heaters. If water heater elements are interlocked so that all elements cannot be used at the same time, the maximum possible load shall be considered the nameplate load.
(4) The nameplate ampere or kilovolt-ampere rating of all motors and of all low-power-factor loads.
(5) The larger of the air-conditioning load or the space-heating load.
220.33 Optional Calculation — Two Dwelling Units.
Where two dwelling units are supplied by a single feeder and the computed load under Part II of this article exceeds that for three identical units computed under 220.32, the lesser of the two loads shall be permitted to be used.
Last edited by gfretwell; 06/28/07 11:28 AM.