At what pressure must a warning alarm activate in the air system?

The correct activation pressure for a warning alarm in the air system is 60 psi. This value is established to ensure that operators are alerted when the air supply is getting low, allowing them to take appropriate action before reaching critically low levels that could compromise safety and performance.

At 60 psi, the warning system provides a crucial buffer zone. It gives the driver/operator time to respond, either by checking the system or by making decisions about whether to continue operations or to return to a safe location to recharge the air system. By setting this threshold, safety protocols are maintained, reducing the risk of incidents due to unexpected loss of air pressure.

It is essential to know this specification as part of operating and maintaining firefighting equipment, where pneumatic systems play a vital role in functionality.