Under the optional method, the 40% demand factor for electric space heating applies to how many separate units?

Under the optional method, the 40% demand factor for electric space heating applies to how many separate units?

• A. four or more
• B. two
• C. one
• D. three

Answer: (A)

The concept here is load diversity under the optional method for electric space heating. When you have multiple separate units, not all spaces will demand heat at the same moment, so you can apply a reduced demand factor to the total electric heating load. The 40% factor is used only if there are four or more separate units. This reflects a significant likelihood that not all units will be heating simultaneously, allowing you to use a smaller portion of the connected heating load for the demand calculation. With fewer than four units, the code does not permit this 40% reduction, so the factor applied would be higher (or the standard method used). So, the 40% demand factor applies to four or more separate units.

The concept here is load diversity under the optional method for electric space heating. When you have multiple separate units, not all spaces will demand heat at the same moment, so you can apply a reduced demand factor to the total electric heating load.

The 40% factor is used only if there are four or more separate units. This reflects a significant likelihood that not all units will be heating simultaneously, allowing you to use a smaller portion of the connected heating load for the demand calculation. With fewer than four units, the code does not permit this 40% reduction, so the factor applied would be higher (or the standard method used).

So, the 40% demand factor applies to four or more separate units.