A feeder supplying a 5 kW wall-mounted oven and a 7 kW counter-mounted cooktop must have a minimum demand factor of what?

To determine the minimum demand for a feeder supplying both a wall-mounted oven and a counter-mounted cooktop, you need to apply the concept of demand factors in electrical load calculations.

First, add the total load of the appliances together: 5 kW (oven) + 7 kW (cooktop) gives you a total load of 12 kW. However, when calculating demand, it’s typical to consider that not all devices will be running at full capacity simultaneously due to the way these appliances are used.

According to the demand factors often applied in electrical design, there is an established way to calculate the demand for kitchen equipment. For fixed cooking appliances, there typically is a requirement to use a demand factor to account for simultaneous use: generally, the first 12 kW would have a demand factor of about 0.75 or somewhat lower depending on specific guidelines, which helps to establish a more realistic expectation of actual usage.

Applying this 0.75 demand factor gives us approximately 9 kW (using the full capacity without factoring in usage), adjusted for load diversity and practicality. However, standards might vary, and some constructions may suggest a direct demand calculation approach.

Looking at the answer choices provided, we see that the