Hello everybody

I'm new on the trade and also in the process of finishing my electrician studies, so sorry on my lack of knowledge on the topic. I got a few doubts on Standard Dwelling Load Calculation, basically with the terminology on the question: Demand Load, Demand Load Branch Circuit, Demand line and neutral on residence, etc. My understanding is when they asked for any "Demand calculation" it has to be determined by applying the proper demand factor to the loads by Table 220.42, 220.53, Table 222.54, Table 220.55, 220.60, 220.61, 220.82(C), etc. I'm not looking someone that give me the question's answer, only I would like to know if the process applied to get the answer was the correct or not. It wasn't I will appreciate any help of my mistake and any help to get right understanding. These are the 3 of the questions:

**QUESTION 1**: What would be the demand load for this branch circuit for the loads 1, 2, and 3?

**Load 1 : General lighting and Receptacle and Small-appliance**- General Lighting & Receptacle
- 3VA(3,800ft²) = 11,400VA/120V = 95A

- Small-appliance
- 1,500VA(3) = 4,500VA/120V = 37.5A = 38A

- Total
- 11,400VA + 4,500VA = 15.9kVA
- Branch Circuit Demand Load 1 = 15.9kVA @ 133A

- 11,400VA + 4,500VA = 15.9kVA

- General Lighting & Receptacle
**Load 2: Cooking Equipment**- Per Table 220.55 Note #4
- Cooktop: 8kW
- Wall Oven1: 6kW
- Wall Oven2: 6kW
- 8kW + 6kW + 6kW = 20kW

- Per Table 220.55 Note #1 & Column C
- Equivalent Range = 20kW
- 20kW - 12kW = 8kW
- 8(5%) = 40%
- 12kW = 8kW(1.4) = 11.2kW
- 11,200VA/240V = 46.67A
- Branch Circuit Demand Load 2 = 11.2kVA @ 47A

- Equivalent Range = 20kW

- Per Table 220.55 Note #4
**Load 3: Special Appliance**- Per 220.53, 210.19(A)(1), 220.14(A)-(C), 220.18(A), 422.10 & 430
- Water Heater: 28,000VA(0.75) = 21,000VA/240V = 87.5A
- Dishwasher: 1,200VA(0.75) = 900VA/120V = 7.5A
- Food Disposal: 1,200VA(0.75) = 900VA/120V = 7.5A
- Attic Fan: 750VA(0.75) = 562.5VA/120V = 4.69A
- Attic Fan: 750VA(0.75) = 562.5VA/120V = 4.69A
- Total = 28kVA + 2(1.2kVA) + 2(0.750kVA) = 31.9kVA
- Branch Circuit Demand Load 3 = 31.9kVA @ 149A

- Per 220.53, 210.19(A)(1), 220.14(A)-(C), 220.18(A), 422.10 & 430

**QUESTION 2**: Determine the line and the neutral load for the dishwasher and range circuit in this residence.

- The neutral load in a 120V circuit is equal to the line load.
- Power Factor (inductive loads only): 1kVA = 0.85kW
- Dishwasher: 1.2kVA(0.85kW) = 1.02kW
- Per 210.19(A)(1) & 220.14(A)
- I = P/E

- Per 210.19(A)(1) & 220.14(A)

I = 1,200VA/120V

I = 10A

- Line & Neutral Circuit Load = 1.2kVA @ 10A

**QUESTION 3**: Determine the line and the neutral load for the water heater in this residence.

- Water Heater: 28kVA
- Per 210.19(A)(1), 220.14(A) & 422.10
- I = P/E

- Per 210.19(A)(1), 220.14(A) & 422.10

I = 28,000VA/240V

I = 116.67A = 117A

- Line Load = 28,000VA
- The water heater (240V circuit) does not need a neutral wire, because the two hot lines complete the whole current path in the circuit.
- Neutral load = 0