1. Locate the Grounding Bar (PE Bar) Open the distribution box and identify the grounding bar, often marked as "PE" or with a grounding symbol. This is the designated point for connecting all ground wires in the box . 2. Prepare the Ground Wire Use a yellow-green insulated copper wire with a cross-sectional area meeting local electrical codes (commonly at least 6 mm² outside the US or 10 AWG in the US). Strip the insulation for a short length to expose the copper core . 3. Connect the Ground Wire Attach the stripped end of the ground wire to the PE bar using a screw or terminal. Tighten securely to ensure a firm connection. If the distribution box contains electrical components that require grounding, connect them to the PE bar using additional copper wires . 4. Connect to the Grounding Electrode Lead the other end of the ground wire to a grounding rod or grounding grid buried in the earth. Ensure the contact area is sufficient for a low-resistance connection. Use fasteners such as screws, nuts, and washers to secure the wire . 5. Test Grounding Resistance Use a grounding resistance tester to verify that the resistance is within safe limits (typically below 4 ohms for household systems). If resistance is too high, add more grounding rods or adjust their depth . 6. Mark and Inspect Clearly label the grounding connections for maintenance purposes. Regularly inspect the connections to ensure they remain tight and corrosion-free .
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