How to ground the flexible wire in the distribution box

To ground a flexible wire in a distribution box, connect it securely to the grounding bar or PE bar using a properly sized copper wire, ensuring firm contact and continuity to the main grounding system. Steps for Grounding1. Identify the Grounding Point: Open the distribution box and locate the grounding bar (often marked as PE or with a green/yellow color).

This is the designated point for connecting all ground wires. 2. Select the Correct Wire: Use a flexible copper wire with a cross-sectional area that meets local standards (e.g., 6 mm² outside the US or 10 AWG in the US).

The wire should be insulated with yellow-green coloring for easy identification. 3. Prepare the Wire: Strip the insulation from the end of the flexible wire to expose enough copper for a secure connection.

Avoid damaging the wire strands to maintain conductivity. 4. Connect to the Grounding Bar: Attach the stripped end of the wire to the grounding bar using a screw terminal.

Tighten the screw firmly to ensure a solid mechanical and electrical connection. For devices inside the box, you can use pigtails or ground clips to connect each component to the grounding bar. 5.

Bond to the Main Ground: Ensure the grounding bar is connected to the main grounding system, such as a grounding rod or central grounding point. This may involve connecting the bar to a metal mounting plate or directly to a buried ground rod. 6.

Verify Grounding: Use a voltmeter or ground resistance tester to measure the resistance between the distribution box and the main ground. The resistance should meet safety standards (typically below 25 ohms for building installations) to ensure effective grounding. 7.

Additional Precautions: Ensure all connections are tight and free from corrosion. Clearly mark grounding connections for inspection and maintenance. Avoid looping multiple wires in a way that could create loose or high-resistance connections.

By following these steps, the flexible wire will be properly grounded, providing safety for both the electrical system and personnel.