Price of grounding bolts at the rear of the distribution box

Grounding bolts for distribution boxes typically range from €5 to €20 per piece, depending on material, size, and supplier.

Overview

Grounding bolts are essential for safely connecting the distribution box to the earth, ensuring proper electrical grounding. They are often made of copper or zinc-plated steel and may come as part of a grounding strip or busbar kit for easier installation .

Example Pricing

• Copper grounding strip kit (2 rails): Approximately €12–€15 per pack on Amazon, including screws and terminal blocks suitable for distribution boxes .
• Individual electrical grounding bolts: Available from suppliers like McMaster-Carr, with prices typically starting around $5–$10 per bolt, depending on size and type (hex head, socket head, etc.), .
• Grounding busbars with mounting hardware: Platt Electric Supply offers copper busbars with included stainless steel bolts, ranging from $10–$20 per unit, depending on the number of ports and dimensions .

Installation Notes

• Grounding bolts are usually attached to threaded studs at the bottom of the distribution box, connecting to the mounting plate and then to the central grounding point .
• Proper sizing of the ground wire is important: in the US, a 10 AWG wire is standard, while in other markets a 6 mm² wire is recommended .
• Ensure the total ground resistance is below 0.1 Ohm for safety and compliance .

Summary

For a standard distribution box, you can expect to pay €5–€20 per grounding bolt, with kits including multiple bolts and copper strips costing slightly more. Prices vary based on material, size, and supplier, and purchasing a complete grounding kit may provide better value and easier installation.