What is the minimum deployment delay for a fixed system in a machinery space?

The minimum deployment delay for a fixed system in a machinery space is established to ensure that the system operates effectively and safely during a fire or other incident in that area. A deployment delay of 20 seconds is standard as it allows for a brief window during which personnel can assess the situation before the automatic suppression system is activated. This delay helps mitigate any potential false activations that could occur if there is a temporary incident, such as a small flare-up that may self-extinguish.

Having a predefined delay also provides crew members (if present) a chance to take any necessary actions before the system engages, ensuring that the appropriate steps can be taken to address the emergency effectively. Therefore, a 20-second delay balances the need for safety with the potential need for human intervention in the event of a minor fire.