For testing other PV-pole(s) the test circuit may be duplicated or movedTest circuit for testing the PV-poleFor the continuous residual current test, R1 establishes a baseline current just below the trip point, and R2 is switched in to cause the current to exceed the trip point. Capacitor C1 is not used.For the sudden change residual current test, C1 establishes a baseline current and R1 or R2 is switched in to cause the desired value of sudden change. The other resistor is not used.Figure 21 – Example test circuit for residual current detection testing