The Basics of Grounding & Bonding Electrical Systems | EC&M
The smaller bare copper conductor on the left is the equipment grounding conductor providing bonding. The larger bare copper on
Function of grounding flat copper wire in distribution box
Proper grounding of a copper wire in a distribution box ensures electrical safety, prevents surges, and maintains low-resistance connections.
Identifying the Grounding Point
Open the distribution box and locate the grounding bar or PE (Protective Earth) bar, which is typically marked with a grounding symbol or the letters "PE" . This bar serves as the central connection point for all grounding wires within the box. Any electrical components that require grounding should also be connected to this bar to ensure safe operation .
Selecting the Wire
Use a yellow-green insulated copper wire with a cross-sectional area that meets or exceeds the specifications for your system. For example, in the US, a 10 AWG (5.26 mm²) wire is standard, while in other markets, a 6 mm² wire may be used . Copper is preferred for its excellent conductivity and long-term reliability, especially for buried or exposed runs .
Connecting the Wire
- Strip the insulation from the end of the copper wire to expose the conductor.
- Attach the wire to the PE bar using a screw or terminal, ensuring a firm and secure connection . Tighten the screw with a screwdriver to prevent loosening over time.
- Ground electrical components inside the box by connecting them to the PE bar with additional copper wires if needed .
- Mark the connections clearly for inspection and maintenance purposes .
For distribution boxes with mounting plates or spindles, additional grounding may be required. For example, a wire may run from the mounting plate to the central grounding point, ensuring the total resistance between all system parts is below 0.1 Ohm .
Wire Types and Flexibility
For tight spaces or control cabinets, stranded copper wires with pre-attached terminals (spade or ring) are recommended. These allow easy installation without cutting or terminating the wire, and they maintain low resistance while being flexible enough to maneuver around corners .
Safety and Testing
- Ensure all connections are tight and corrosion-free.
- Test the grounding system to confirm resistance is within acceptable limits (typically < 25 Ohms for general grounding, < 0.1 Ohm for critical equipment), .
- Avoid using aluminum for buried runs, as it corrodes over time .
Following these steps ensures that your distribution box is safely grounded, protecting both equipment and personnel from electrical faults.
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