9.7.8 Verification of protective conductor contact behaviour9.7.8.1 Verification of protective conductor contact coupling when closingThe tests, by changing the pilot status from state B to state C, shall verify that the protective conductor does not close later than L or N contacts close. The tests are made at 0.85 times and 1.1 times of rated voltage. 9.7.8.2 Verification of protective conductor contact coupling when openingThe tests shall verify, by changing the pilot status from state C to state B, that the protective conductor does not open earlier than L and N open. The tests are made at 0,85 times and 1.1 times of rated voltage and when the supply voltage is slowly reduced down to 50 V a.c. The protective conductor contact function should be verified. One sample of IC-CPD shall be prepared that will not open the L contact again after closing (thus simulating a welded L contact). The test is performed as follows:The contacts are activated by using the control pilot transition from B to C. The protective conductor contact shall be verified to be closed. The contacts are then initiated to open by the control function transition from C to B.The result shall be that the L contact remains closed (simulated welded L contact) and that the protective conductor contact does not open.