Analysis of the reasons for the operation of the RCD and the troubleshooting algorithm

When triggered RCD it is necessary to determine the type of fault in the electrical network. Procedure electrician the next one.

1. Lift the RCD. If the RCD is charging, then it means that there has been an earth leakage in the electrical installation caused by an unstable or transient insulation failure. In this case, it is necessary to carry out a general control of the insulation condition. Check the operation of the RCD by pressing the TEST button.

2. If the RCD charges and trips immediately, it means that either there is an insulation fault in the electrical installation any electrical receiver, electrical wires, electrical panel wires, or the RCD is defective. In this case, you must perform the following actions:

3. Switch off all group circuit breakers protected by RCDs.

4.If the circuit breakers are single-pole or three-pole and do not open neutral working conductors, then taking into account that current leakage is also possible from the neutral working conductor, in order to detect a faulty circuit, it may be necessary to disconnect all neutral working conductors from the bus .

5. Lift the RCD.

6. If the RCD is charged, check the RCD performance by pressing the TEST button. A momentary tripping of the RCD means that it is working correctly, but there is a current leakage in the protected circuit. If the RCD does not charge, this means that there is a breakdown in the insulation of the electrical panel wiring assembly or a malfunction of the RCD.

7. Turn on automatic switches.

8. If the RCD trips when a particular circuit breaker is turned on, it means that there is an insulation fault in the circuit of that circuit breaker.

9. Disable or disconnect all electrical receivers in the circuit of the switch, when it is turned on, the RCD is triggered.

10. Charge the RCD.

11. If the RCD is charging, it means that there is insulation in one of the electrical receivers. If the RCD does not charge with all power consumers of this circuit turned off, this means that the insulation of the electrical wires is defective.

12. Sequentially turn on each electrical receiver of this circuit.

13. RCD breaks when you turn on a certain electrical receiver.

14. Disable a faulty electrical receiver.

15. Connect all electrical receivers (except the defective one), charge the RCD, make sure that the RCD is not working. Check the operation of the RCD by pressing the TEST button.