Hello,
Beside the many KNX actors on the DIN rail, I also use several KNX UP actors (heizungaktor, schaltaktor, dimmaktor). Those are always in the same central-ceiling-box where KNX wires enter the same box as Phase/Neutral 230VAC wires.
I am afraid that a Phase wire will ever contact a KNX line and what will happen in that case?
First, the Earth-Leakage (RCBO, 30mA) will immediatelly shut off for that Phase wire. But what about the harm which is done to the KNX bus? I mean, there will be a very short moment being 230V on 1 of the wires. Will all devices on the bus probably be broken? And can this be overcome by installing a BT24 or other Dehn Blitzschutz devices?
Of course I try to make sure all wiring is as secure as possible. But having 230V WAGO connectors in the same central-lighting-box as a the KNX-WAGO connectors make me always a bit nerveous.
According to the datasheet of the BT24 (which is a Type2) it is:
Nominal voltage (Un): 24 V
Max. continuous operating voltage (d.c.) (UC): 45 V
Nominal current (IL): 6 A
D1 Lightning impulse current (10/350 μs) per line: 1 kA
C2 Nominal discharge current per line (In): 5 kA
Voltage protection level line-line for In C2: ≤ 1200 V
Voltage protection level line-PG for In C2: ≤ 650 V
Voltage protection level line-line at 1 kV/μs C3: ≤ 750 V
Voltage protection level line-PG at 1 kV/μs C3: ≤ 500 V
Which means the BT24 will only detect and connect the line to earth at >500V, right? Not at 45V?
Beside the many KNX actors on the DIN rail, I also use several KNX UP actors (heizungaktor, schaltaktor, dimmaktor). Those are always in the same central-ceiling-box where KNX wires enter the same box as Phase/Neutral 230VAC wires.
I am afraid that a Phase wire will ever contact a KNX line and what will happen in that case?
First, the Earth-Leakage (RCBO, 30mA) will immediatelly shut off for that Phase wire. But what about the harm which is done to the KNX bus? I mean, there will be a very short moment being 230V on 1 of the wires. Will all devices on the bus probably be broken? And can this be overcome by installing a BT24 or other Dehn Blitzschutz devices?
Of course I try to make sure all wiring is as secure as possible. But having 230V WAGO connectors in the same central-lighting-box as a the KNX-WAGO connectors make me always a bit nerveous.
According to the datasheet of the BT24 (which is a Type2) it is:
Nominal voltage (Un): 24 V
Max. continuous operating voltage (d.c.) (UC): 45 V
Nominal current (IL): 6 A
D1 Lightning impulse current (10/350 μs) per line: 1 kA
C2 Nominal discharge current per line (In): 5 kA
Voltage protection level line-line for In C2: ≤ 1200 V
Voltage protection level line-PG for In C2: ≤ 650 V
Voltage protection level line-line at 1 kV/μs C3: ≤ 750 V
Voltage protection level line-PG at 1 kV/μs C3: ≤ 500 V
Which means the BT24 will only detect and connect the line to earth at >500V, right? Not at 45V?