1. Locate the Grounding Bar (PE Bar) Open the distribution box and identify the grounding bar, often marked with "PE" or a grounding symbol. This bar serves as the central point for all grounding connections inside the box . 2. Select the Ground Wire Use a yellow-green insulated copper wire with a cross-sectional area meeting local code requirements (typically at least 6 mm² outside the US or 10 AWG in the US). This wire ensures good conductivity and provides a visual warning for safety . 3. Connect the Main Ground Wire Strip the insulation at the end of the wire and attach it securely to the PE bar using a screw terminal. Tighten firmly to prevent loosening over time . This wire should connect to the building's main grounding system or grounding rod, ensuring a low-resistance path to earth (ideally <25 ohms, or <0.1 ohm for sensitive equipment), . 4. Ground Internal Components If the distribution box contains metallic components or electrical devices, connect each to the PE bar using individual copper wires. This ensures all parts are at the same potential and reduces the risk of electric shock or equipment damage . 5. Bonding and Continuity Bond all metallic enclosures, raceways, and equipment grounding conductors into a continuous system. This prevents voltage differences between components and allows overcurrent devices to operate effectively during faults . 6. Verify and Label After installation, test the grounding resistance with a multimeter or specialized tester. Clearly label all grounding connections for maintenance and inspection purposes .
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