How does NFPA 13 classify Ordinary Hazard compared to Light Hazard?

NFPA 13 classifies Ordinary Hazard as a condition that presents a greater risk of fire compared to Light Hazard. This classification is based on the types of materials present and the potential for ignition. Ordinary Hazard locations typically have moderate combustibility; this may include materials like wood, plastics, and certain textiles that are more likely to ignite and sustain a fire compared to the materials found in Light Hazard environments.

In Light Hazard situations, the materials present are generally less combustible, such as residential or light commercial environments, which contain less flammable substances. Therefore, the Ordinary Hazard classification indicates a higher degree of combustibility compared to Light Hazard, justifying the decision to implement more robust fire protection measures in those areas to mitigate the increased risk.