The waterflow switches shall have _______________ time-delay in a sprinklered elevator hoistway.

In the context of fire alarm systems, waterflow switches are devices that detect the flow of water in a sprinkler system, indicating that the system has been activated. In an elevator hoistway, it is crucial for safety and reliable system performance to ensure that the detection of water flow occurs immediately without any delays.

Having no time-delay for the waterflow switches in a sprinklered elevator hoistway ensures that if there is water flow due to a fire activation, the alarm is triggered immediately. This allows for a prompt response from emergency services and helps to ensure the safety of any occupants within the building. It prevents delays that could occur if a time-delay were included, which could result in critical time lost during an emergency evacuation or response.

In this application, the immediate activation of alarms and possibly other safety measures is paramount, making the option to have no time-delay the most appropriate choice for ensuring the highest level of safety for building occupants.