In a 1,600 sq. ft. dwelling unit with 74 receptacle outlets, what is the calculated feeder load for lighting and other loads?

In a 1,600 sq. ft. dwelling unit with 74 receptacle outlets, what is the calculated feeder load for lighting and other loads?

• A. 4,105 volt-amperes
• B. 5,205 volt-amperes
• C. 6,305 volt-amperes
• D. 7,405 volt-amperes

Answer: (B)

To determine the calculated feeder load for lighting and other loads in a dwelling unit, we follow the general calculation rules provided in the National Electrical Code (NEC). Firstly, for a dwelling unit, the basic load calculation begins with calculating the demand for lighting. According to NEC, the general lighting loads can be calculated at 3 watts per square foot for the first 3,000 square feet. For a 1,600 square foot dwelling, the calculation would be: 1,600 sq. ft. x 3 watts/sq. ft. = 4,800 watts. Next, we need to incorporate the receptacle outlets. Typically, we consider a demand of 1 volt-ampere (VA) per square foot for receptacle outlets and to get the total demand, we apply the NEC's demand factors which are often reduced based on the number of outlets. In this case, with 74 receptacle outlets, we would typically count each outlet at 1 VA initially. Adding this, we can estimate: 74 receptacles x 1 VA = 74 VA Combining this with the lighting load, we convert watts to volt-amperes (assuming a power factor of 1 for simplicity): 4,800

To determine the calculated feeder load for lighting and other loads in a dwelling unit, we follow the general calculation rules provided in the National Electrical Code (NEC).

Firstly, for a dwelling unit, the basic load calculation begins with calculating the demand for lighting. According to NEC, the general lighting loads can be calculated at 3 watts per square foot for the first 3,000 square feet. For a 1,600 square foot dwelling, the calculation would be:

1,600 sq. ft. x 3 watts/sq. ft. = 4,800 watts.

Next, we need to incorporate the receptacle outlets. Typically, we consider a demand of 1 volt-ampere (VA) per square foot for receptacle outlets and to get the total demand, we apply the NEC's demand factors which are often reduced based on the number of outlets.

In this case, with 74 receptacle outlets, we would typically count each outlet at 1 VA initially. Adding this, we can estimate:

74 receptacles x 1 VA = 74 VA

Combining this with the lighting load, we convert watts to volt-amperes (assuming a power factor of 1 for simplicity):

4,800