Demand Factor Calculator
Apply NEC demand factors to convert connected load to demand load.
About Demand Factors
Connected Load: Sum of all nameplate ratings of equipment that could potentially operate.
Demand Load: Portion of connected load expected to operate simultaneously.
Demand Factor: Ratio of demand load to connected load (always 100% or less).
NEC Demand Factor Tables
Table 220.42 - General Lighting
| Type of Occupancy | Portion of Load | Demand Factor |
|---|---|---|
| Dwelling Units | First 3000 VA | 100% |
| 3001 to 120,000 VA | 35% | |
| Over 120,000 VA | 25% | |
| Hospitals | First 50,000 VA | 40% |
| Remainder | 20% | |
| Hotels/Motels | First 20,000 VA | 50% |
| Remainder | 40% | |
| Warehouses | First 12,500 VA | 100% |
| Remainder | 50% | |
| All Others | Total | 100% |
Table 220.54 - Electric Dryers
| Number of Dryers | Demand Factor (%) |
|---|---|
| 1-4 | 100% |
| 5 | 85% |
| 6 | 75% |
| 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+ | 25% |