Distribution box ground wire cover plate

The distribution box cover plate should be connected to the grounding system using a dedicated ground wire to ensure safety and maintain a resistance below 0. 1 ohm.

Proper Grounding Procedure

Connect the Cover Plate to the Mounting Plate: Attach a ground wire from a threaded stud on the bottom of the distribution box housing to the mounting plate. This ensures the cover plate is electrically bonded to the main structure of the box ( ). Connect the Mounting Plate to the Central Ground: From the mounting plate, run a second ground wire to the factory central grounding point or the main grounding bus.

This creates a continuous path to earth, which is critical for safety ( ). Wire Specifications: Use a copper wire of appropriate cross-section. For example, in the US, a 6 AWG (13.

29 mm²) wire is recommended to maintain low resistance. The total ground resistance between all system parts should be less than 0. 1 ohm ( ).

Grounding the Internal Components: All electrical components inside the box that require grounding must be connected to the PE (protective earth) bus. The metal box itself should also be connected to the PE bus using a copper core wire or braided soft wire ( ). Additional Connections: Any metal conduit or threaded pipes connected to the box should be electrically bonded to the box, either by welding or using proper connectors, to ensure the entire system is at the same potential ( ).

Key Safety Considerations

Test Resistance: After installation, measure the grounding resistance to ensure it meets the required standard (