ICC Residential Electrical Inspectors Practice Exam

What is the minimum calculated demand load for a branch circuit supplying one 8 kVA wall-mounted oven and a 5 kVA counter-mounted cooking unit?

1. 6.75 kVA

2. 9.75 kVA

3. 12.00 kVA

4. 11.00 kVA

The correct answer is: 9.75 kVA

To determine the minimum calculated demand load for the branch circuit supplying both the wall-mounted oven and the counter-mounted cooking unit, specific calculations based on the demand factors for different kitchen appliances must be applied. When calculating the demand load for cooking appliances, according to the National Electrical Code (NEC), we typically use demand factors that may allow reductions based on how often these appliances are used simultaneously. For this scenario: 1. The wall-mounted oven has a full demand of 8 kVA. 2. The counter-mounted cooking unit has a full demand of 5 kVA. When both appliances are used, the total demand without considering any demand factors would be 8 kVA + 5 kVA = 13 kVA. However, because these are assumed to not be used at full capacity simultaneously most of the time, the NEC permits certain reductions. The calculations allow for a specific percentage of the first cooking appliance's rating to be included in the overall load calculation. In many cases, for two cooking appliances, a factor is applied where the first appliance is counted in full (100%), and the second one might only count as a percentage (typically 75%). In this case: - The first appliance (oven) = 8 kVA