1. The installation of a residual current device (RCD) should comply with the manufacturer's product manual.
2. RCDs marked with the power supply side and load side must not be connected in reverse. Reversed connection will prevent the tripping coil of an electronic RCD from disconnecting when the power is cut off, leading to prolonged energization and burnout.
3. Installing an RCD should not remove or abandon existing safety protection measures; the RCD should only be used as an additional protection measure within the electrical safety protection system.
4. When installing an RCD, the neutral conductor and protective conductor must be strictly distinguished. When using three-pole four-wire or four-pole four-wire RCDs, the neutral conductor should be connected to the RCD. The neutral conductor passing through the RCD must not be used as the protective conductor.
5. The neutral conductor must not be repeatedly grounded on the load side of the RCD; otherwise, the RCD will not function properly.
6. For branches using residual current devices (RCDs), the neutral wire can only be used as the neutral wire for that circuit. It is prohibited to connect it to the neutral wire of other circuits, and other lines or equipment cannot use the neutral wire of a line or equipment already equipped with an RCD.
7. After installation, the completed RCD must be tested according to Clause 3.1.6 of the "Code for Acceptance of Construction Quality of Building Electrical Engineering (GB50303-2002)," which states that "RCDs for power and lighting projects shall undergo a simulated operation test," to ensure its sensitivity and reliability. During the test, the test button should be operated three times, with the circuit switching on and off under load three times. Only after confirming correct operation can the circuit be officially put into use.
