NEC Article 220 is the reference standard for calculating electrical service and feeder loads. FrameAI automates the whole workflow — from your panel schedule Excel to a complete load calculation worksheet covering all demand categories required by AHJs.
NEC Table 220.12 gives demand factors in VA per square foot for different building area ranges. FrameAI applies the correct VA/sqft for your building square footage and generates a per-panel lighting demand figure.
Demand VA = Building sqft × VA/sqft (from Table 220.12)
NEC 220.42 requires receptacle loads to be computed at 180 VA per strap (single-phase) or per yoke. FrameAI applies the two-tier demand factors: first 10,000 VA at 100%, remainder at 50% (for non-dwelling occupancies).
First 10,000 VA at 100% + remainder at 50%
| Receptacle VA | Demand Factor | Demand VA |
|---|---|---|
| 0 – 10,000 VA | 100% | VA × 1.00 |
| > 10,000 VA | 50% | 10,000 + (VA−10,000) × 0.50 |
The largest motor load is computed at 125% of its full-load current. Additional motors are computed at 100%. FrameAI identifies the largest motor per panel and applies the correct multiplier.
Largest motor: VA × 1.25 | Other motors: VA × 1.00
NEC 210.19(A) Informational Note No. 4 recommends a maximum of 3% voltage drop on branch circuits and 5% total from service to furthest point. FrameAI calculates drop per circuit from watts, length, voltage, and conductor size.
VD% = (k × I × L × 2) ÷ (V × kcmil × div)
k = 12.9 (Cu) | 21.2 (Al) div = 1 (3φ) or 2 (1φ)