Earthing & RCD Setting

Check earth-fault protection per IEC 60364-4-41 for TN, TT and IT systems.

Inputs

System type —

Phase-to-earth voltage U₀ V

Earth-loop / frame resistance Rₐ Ω

Protective device setting Iₙ A

Results

Note — TN requires automatic disconnection within 0.4 s (Id ≥ 5·Iₙ). TT relies on an RCD with Ra·IΔn ≤ U_tol (50 V). IT tolerates a first fault without tripping. Verify with the applicable standard and a certified engineer.