How many master cylinders are required when using slave cylinders without manual actuators?

When using slave cylinders without manual actuators in a dry chemical extinguishing system, two master cylinders are typically required. This is due to the design and function of the extinguishing system, where master cylinders are responsible for supplying the pressurized agent to operate the system effectively.

In systems utilizing slave cylinders, the absence of manual actuators necessitates additional master cylinders to ensure proper functioning and redundancy in the operation. The installation of two master cylinders promotes adequate performance by providing reliability and maintaining pressure throughout the system, particularly during activation and discharge of the dry chemical agent.

This configuration helps ensure that the system remains operational and responsive, fulfilling safety and performance standards as outlined in the NFPA 17 standard. Thus, two master cylinders are the correct choice for effective operation without the reliance on manual activation.