Which of the following is permissible for light hazard occupancies?

For light hazard occupancies, the provision regarding pipe installation is crucial for ensuring the effectiveness of sprinkler systems in these settings. The first choice, which states that pipe can be installed in ordinary hazard rooms, is permissible because light hazard areas can typically include rooms that also serve occasional purposes of higher hazard classifications. This reflects the flexibility in sprinkler installation requirements, allowing for the accommodation of various room types without compromising fire safety.

In the context of light hazard occupancies, pipe materials and sizing may vary, but they must still adhere to appropriate safety standards. The acknowledgment that pipe can be installed in ordinary hazard rooms indicates a recognition of the safety measures involved and the thorough understanding of how different hazards operate in those environments.

The other choices, while addressing aspects of piping, do not fully align with the regulatory framework or functional requirements for light hazard occupancies. For instance, stating that only nonflammable pipe is permissible does not account for the range of materials accepted under these conditions. Similarly, the suggestion that pipes larger than two inches are permissible, or asserting there are no requirements at all, overlooks the specific criteria governing sprinkler systems and the necessary considerations taken for effective fire protection in varying occupancy classifications.