NEC Load Calculations & Branch Circuits 2

Question 1

What is the minimum general lighting load per square foot for a dwelling unit per NEC Table 220.12?

Accepted Answer

3 VA

Answer

Dwelling units use a general lighting load of 3 VA per square foot under the standard calculation method.

Question 2

How many small-appliance branch circuits are required as a minimum in a dwelling kitchen?

Accepted Answer

2

Answer

NEC 210.11(C)(1) requires at least two 20-ampere small-appliance branch circuits for the kitchen, pantry, and dining areas.

Question 3

A 20-ampere branch circuit at 120 volts has a maximum continuous load rating of how many amperes?

Accepted Answer

16 A

Answer

Continuous loads are limited to 80% of the circuit rating, so 20 A x 0.80 = 16 A.

Question 4

What VA value is used for each small-appliance and laundry branch circuit in the standard dwelling calculation?

Accepted Answer

1500 VA

Answer

NEC 220.52 requires a minimum of 1500 VA for each small-appliance and laundry branch circuit.

Question 5

Under the standard method, what demand factor applies to the dwelling general lighting load above the first 3000 VA up to 120,000 VA?

Accepted Answer

35%

Answer

Per NEC Table 220.42, the portion from 3001 to 120,000 VA is taken at 35%.

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