What are "obstruction rules" in NFPA 13?

Obstruction rules in NFPA 13 are focused on maintaining acceptable distances from obstructions in order to ensure that sprinkler systems operate effectively. These rules help to prevent any physical barriers from interfering with the spray patterns or distribution of water from sprinklers. Proper spacing ensures that the water can reach the intended areas without being blocked, which is crucial for achieving adequate fire protection.

The goal is to create a safe environment where sprinklers can perform optimally by reducing dead spots and ensuring that all parts of a designated area are adequately covered in the event of a fire. This is especially important in spaces where equipment, structures, or other elements may disrupt the intended flow of water.

While other options may concern relevant topics in building safety or fire protection, they do not address the particular function that obstruction rules serve within the context of sprinkler system installation as described in NFPA 13.