⚡ PEC Load Estimator

PEC 2017 · Article 2.20

💡 1. General Lighting

PEC Table 2.20.3.3 — 100% on first 3,000 VA · 35% next 117,000 VA · 25% above 120,000 VA

🍳 2. Fixed Appliances (Cooking)

PEC Table 2.20.3.16 — demand factor from Col A / B / C based on unit kW rating

🧺 3. Clothes Dryers

PEC Table 2.20.3.6 — minimum 5,000 VA per dryer; 100% demand factor

🌀 4. Largest Motor Load

PEC Rule — Demand = FLC × Voltage × 1.25 (125% of full-load current)

📖 PEC Standard Reference Based on PEC 2017, Part 1, Article 2.20 — Feeder and Service Load Calculations for Dwelling Units.

⚙️ Reference Tables

HP115 V200 V208 V230 V
1/6 4.42.5 2.42.2
1/4 5.83.3 3.22.9
1/3 7.24.1 4.03.6
1/2 9.85.6 5.44.9
3/4 13.87.9 7.66.9
1 169.2 8.88.0
1.5 2011.5 11.010.0
2 2413.8 13.212.0
3 3419.6 18.717.0
5 5632.2 30.828.0
7.5 8046.0 44.040.0
10 10057.5 55.050.0
Portion of Lighting Load (VA)Demand Factor
First 3,000 VA100%
Next 117,000 VA (3,001 – 120,000)35%
Over 120,000 VA25%

Source: PEC 2017 Table 2.20.3.3 — applies to general illumination in dwelling units. Small appliance and laundry branch-circuit loads may be included.

Number of DryersDemand Factor
1 – 4100%
580%
670%
765%
860%
955%
10 +50%

Minimum load per dryer = 5,000 VA (PEC Rule). This calculator uses 100% demand factor regardless of quantity — conservative approach for residential estimation.

Qty Col A — Max Demand (kW)
(> 8.75 kW units)		 Col B — Demand Factor
(< 3.5 kW units)		 Col C — Demand Factor
(3.5 – 8.75 kW units)
1 8 kW 80% 80%
2 11 kW 75% 65%
3 14 kW 70% 55%
4 17 kW 66% 50%
5 20 kW 62% 45%
6 21 kW 59% 43%
7 22 kW 56% 40%
8 23 kW 53% 36%
9 24 kW 51% 35%
10 25 kW 49% 34%
11 26 kW 47% 32%
12 27 kW 45% 32%
13 28 kW 43% 32%
14 29 kW 41% 32%
15 30 kW 40% 32%
16 31 kW 39% 28%
17 32 kW 38% 28%
18 33 kW 37% 28%
19 34 kW 36% 28%
20 35 kW 35% 28%
21 36 kW 34% 26%
22 37 kW 33% 26%
23 38 kW 32% 26%
24 39 kW 31% 26%
25 40 kW 30% 26%