What is the maximum number of supervisory switches allowed according to the regulations?

The correct answer reflects the regulatory standards that define the limits on supervisory switches in low voltage special systems. According to the relevant codes and standards, a maximum of 20 supervisory switches is permissible for effective monitoring and control systems. This limit is established to maintain system reliability and ensure that each supervisory switch can be efficiently managed.

Having too many supervisory switches can lead to issues such as increased complexity in monitoring, potential for miscommunication within the system, and difficulties in troubleshooting. By maintaining a limit of 20, the system can ensure proper performance and facilitate easier management of the supervisory functions. This balance helps in optimizing the control measures necessary for the safety and efficiency of the installation.