What is a key feature of an automatic standpipe system?

An automatic standpipe system is designed to operate without manual activation. This means that when conditions warrant it, such as a fire event, the system can automatically activate to provide necessary water flow for firefighting efforts without the need for personnel to manually turn it on or engage it in any way. This feature is particularly critical in emergencies, as it allows firefighters to focus on their response rather than having to locate and activate equipment.

Other options emphasize functionality that is not characteristic of automatic systems. For instance, requiring manual activation would classify the system as a manual standpipe, which is quite different from an automatic system. Additionally, while some systems may integrate features like smoke detectors, they are not exclusive triggers for standpipe activation. Finally, having a separate power source is not a defining feature of all standpipe systems, as many operate through the building's existing water supply rather than relying solely on alternative power sources.