How many water flow switches are allowed on a single IDC?

How many water flow switches are allowed on a single IDC?

• A. 4
• B. 5
• C. 6
• D. 7

Answer: (B)

Water flow switches are initiating devices on an Initiating Device Circuit, and the panel must supervise each one reliably. Each added switch increases the monitoring and the load on that circuit, so the system limits how many can be connected to a single IDC. Five water flow switches per IDC is the standard limit used to keep supervision reliable and prevent exceeding the circuit’s practical capacity. If more switches are needed, they should be distributed across additional IDCs or interfaced through a relay/isolator arrangement so the panel can still monitor each device properly. Five is the practical limit you’d use on a single IDC.

Water flow switches are initiating devices on an Initiating Device Circuit, and the panel must supervise each one reliably. Each added switch increases the monitoring and the load on that circuit, so the system limits how many can be connected to a single IDC. Five water flow switches per IDC is the standard limit used to keep supervision reliable and prevent exceeding the circuit’s practical capacity. If more switches are needed, they should be distributed across additional IDCs or interfaced through a relay/isolator arrangement so the panel can still monitor each device properly. Five is the practical limit you’d use on a single IDC.