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In Table 601 of the CBC, what do the designations A and B mean?

  1. A has more windows than B

  2. A has a higher fire-resistance rating requirement than B

  3. A is only used for residential buildings

  4. A has more structural steel than B

The correct answer is: A has a higher fire-resistance rating requirement than B

In Table 601 of the California Building Code (CBC), designation A reflects a higher fire-resistance rating requirement compared to designation B. This classification is vital in ensuring that different types of buildings and their construction materials meet specific safety standards, particularly when it comes to fire resistance. Understanding these designations is essential for architects, builders, and engineers to correctly interpret the building codes and apply them to their construction projects. The various classifications help in differentiating the level of fire protection needed, which can be critical depending on the building's purpose and occupancy. The other options do not accurately reflect the meanings of designations A and B. For example, the idea that one designation has more windows than another does not correlate with fire-resistance ratings, nor does it depend on the structural elements like steel. Additionally, the use of designation A is not limited to just residential buildings, as it can be applied to various types of construction requiring specific fire safety measures.