Load calculation for multifamily dwelling units uses which NEC table?

Load calculation for multifamily dwelling units uses which NEC table?

• A. Table 220.54
• B. Table 220.56
• C. Table 220.55
• D. Table 220.84

Answer: (D)

When sizing feeders and services for buildings with more than one dwelling unit, you apply demand factors that reflect shared loads and diversity of use across units. The table that lists these multifamily-specific demand factors and the per-unit loads is the one you use for this scenario. It provides the base general lighting and other residential loads per unit and then applies reduction factors based on how many units are fed by the same service, ensuring the calculated load isn’t overestimated. Other NEC tables cover general lighting loads, appliance loads, or per-square-foot calculations for individual dwelling units, but they don’t address the multifamily building scenario with its collective demand factors. That’s why Table 220.84 is the appropriate reference for load calculation in multifamily dwelling units.

When sizing feeders and services for buildings with more than one dwelling unit, you apply demand factors that reflect shared loads and diversity of use across units. The table that lists these multifamily-specific demand factors and the per-unit loads is the one you use for this scenario. It provides the base general lighting and other residential loads per unit and then applies reduction factors based on how many units are fed by the same service, ensuring the calculated load isn’t overestimated.

Other NEC tables cover general lighting loads, appliance loads, or per-square-foot calculations for individual dwelling units, but they don’t address the multifamily building scenario with its collective demand factors. That’s why Table 220.84 is the appropriate reference for load calculation in multifamily dwelling units.