The optional method of calculation is permitted for a multifamily dwelling if which conditions are met?

The optional method of calculation is permitted for a multifamily dwelling if which conditions are met?

• A. II only
• B. I only
• C. Both I and II
• D. Neither I nor II

Answer: (C)

The main idea here is when you’re allowed to use the optional calculation method for the loads in a multifamily building. This method can simplify sizing by applying specific demand factors instead of adding up every load piece by piece, but it’s only valid if two conditions are met. Those conditions ensure the method’s assumptions are accurate for the building’s situation—for example, that the multiple dwelling units can be treated together in a way that still reflects how they will actually be used and served, and that the service and metering arrangement supports this approach. If one condition isn’t satisfied, using the optional method could under- or over-size the system, so the standard calculation must be used instead. Since both conditions need to be true, the correct outcome is that the optional method is permitted only when both are met.

The main idea here is when you’re allowed to use the optional calculation method for the loads in a multifamily building. This method can simplify sizing by applying specific demand factors instead of adding up every load piece by piece, but it’s only valid if two conditions are met. Those conditions ensure the method’s assumptions are accurate for the building’s situation—for example, that the multiple dwelling units can be treated together in a way that still reflects how they will actually be used and served, and that the service and metering arrangement supports this approach. If one condition isn’t satisfied, using the optional method could under- or over-size the system, so the standard calculation must be used instead. Since both conditions need to be true, the correct outcome is that the optional method is permitted only when both are met.