How to place the grounding strip of the distribution box

The grounding strip (PE bar) should be securely mounted inside the distribution box, connected to the power ground, and all metal components should be bonded to it using appropriately sized copper wires.

Placement of the Grounding Strip

• Locate the PE or grounding bar inside the distribution box, usually marked with "PE" or a grounding symbol ( ).
• Mount the strip firmly to the metal enclosure or mounting plate to ensure a solid electrical connection to the box itself ( ).
• Ensure the strip is easily accessible for inspection and maintenance, without interfering with other components or wiring ( ).

Connection Guidelines

• Power Ground Connection: Connect the main ground wire from the power supply directly to the PE bar. Use a copper core wire with a cross-sectional area meeting local standards (e.g., 6 mm² internationally or 10 AWG in the US) ( ).
• Component Grounding: Any internal metal parts or electrical components that require grounding should be connected to the PE bar using copper wires. This ensures all conductive parts are at the same potential ( ).
• Tight and Secure Connections: Strip the wire appropriately, insert it into the terminal, and tighten screws firmly to prevent loosening over time ( ).

Safety and Compliance

• Wire Insulation: Use yellow-green insulated copper wires for clear identification and safety ( ).
• Resistance Requirements: The total grounding resistance should be low enough to ensure safety; typically, the resistance between system parts should be less than 0.1 ohm ( ).
• Multiple Rods if Needed: If the grounding rod resistance exceeds recommended limits (e.g., >25 ohms), install additional rods connected with continuous conductors to achieve proper grounding ( ).
• Regular Inspection: Clearly mark all grounding connections for routine inspection and maintenance to ensure long-term reliability ( ).

Additional Considerations

• Avoid double-tapping neutrals on the grounding bar; each connection should be dedicated ( ).
• Ensure the grounding system is compliant with local electrical codes (NEC, IEC, or other applicable standards) ( ).
• For long cable runs or multiple spindles, consider additional grounding wires to maintain low resistance and system stability ( ). By following these placement and connection practices, the distribution box grounding strip will provide effective protection against electrical faults, ensuring both personnel safety and equipment reliability.