When is large-diameter supply hose (LDH) permitted as an attack hose?

Large-diameter supply hose (LDH) is distinct from traditional attack hoses, primarily designed for water supply rather than direct firefighting. However, it can be utilized as an attack hose under specific conditions that stem from manufacturer recommendations. Using LDH as an attack hose is acceptable when the manufacturer states that the hose can withstand the operational pressures and conditions found in firefighting scenarios. This guidance ensures that the hose is constructed and rated for such use, providing adequate safety and performance.

While other options might suggest various circumstances under which LDH could be employed as an attack hose, they do not align with established practices or safety protocols. The endorsement of a fire chief or the emergence of emergency scenarios do not inherently validate the use of LDH as an attack hose without the supporting recommendations from the manufacturer. Prioritizing the manufacturer's specifications ensures adherence to safety standards and operational effectiveness.