Commercial Load Calculator

NEC 220 Part III commercial load calculation with demand factors by occupancy type

Building Parameters

Building Square Footage

Occupancy Type

Lighting load for Office: 1 W/sqft × 10,000 sqft = 10,000 W

Receptacle Count

× 180 VA = 9,000 VA

HVAC Load (VA)

Special Equipment (VA)

Service Voltage

Phase

Recommended Service Size

150A

208V 3-Phase

Total Connected Load

49,000 VA

Total Demand Load

44,500 VA

Minimum Amps

123.5A

NEC 220.44 Demand Factor Breakdown

General lighting + receptacles19,000 VA

First 10,000 VA @ 100%10,000 VA

Over 10,000 VA @ 50%4,500 VA

General demand subtotal14,500 VA

HVAC (at 100%)30,000 VA

Total demand44,500 VA

220.12General lighting load based on occupancy type (Table 220.12)

220.44Receptacle demand: first 10 kVA @ 100%, remainder @ 50%

220.14(I)Each receptacle outlet at 180 VA for commercial occupancies

220.50Motor loads per Article 430 (largest motor at 125%)