Question 1 of 10
Which NEC table is primarily used for calculating demand load for household cooking appliances?
Table 220.55 is the core table used for calculating demand loads for ranges and other cooking appliances.
Question 2 of 10
When all cooking appliances are rated between 1¾–8¾ kW, which note is often applicable for determining the demand load?
Note 3 is specifically designed for appliances within the 1¾–8¾ kW range, often allowing for a demand factor reduction.
Question 3 of 10
If a single cooking appliance is rated over 12 kW but not exceeding 27 kW, which note and column are typically used?
Note 1 is applied when a single appliance exceeds 12 kW, and you use Column C as a starting point.
Question 4 of 10
For appliances with unequal ratings over 12 kW, how is the average rating calculated?
The average rating is calculated by dividing the total connected kW by the number of appliances, according to Note 2.
Question 5 of 10
What is the percentage increase applied to the Column C demand for each kW (or major fraction) over 12 kW for a single range, per Note 1?
According to Note 1, the increase is 5% for each kW (or major fraction) over 12 kW.
Question 6 of 10
If an appliance is rated at 14kW, how much is the demand increased according to Note 1?
14kW is 2kW over 12kW. According to Note 1, the demand should be increased by 5% per kW over 12 kW, so 2kW * 5% = 10% increase.
Question 7 of 10
What is the primary objective of range demand calculations?
Demand calculations help size conductors and equipment without oversizing, ensuring safe and efficient operation.
Question 8 of 10
Which of the following phrases is a key indicator of a range demand question?
Range demand questions often use the phrase "household cooking appliances" to identify the problem.
Question 9 of 10
If a dwelling has two ranges, one rated 14 kW and one rated 18 kW. After calculating the average, and increase based on Note 2. What would you do next?
After the average and percentage increase is calculated, the appropriate column value from Table 220.55 is multiplied by the increase factor. The increase factor is 1 + the increase percentage (in decimal format).
Question 10 of 10
When using Note 3 for appliances, the result is often a _________ demand compared to the base demand in Column C.
Note 3 usually results in a lower demand due to the application of a demand factor when the ratings are between 1¾–8¾ kW.
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