Grounding & Bonding — Why it is done And How to Install Properly
Bonding is accomplished when the electrician connects equipment grounding conductors to the equipment grounding terminal bar in
The distribution box has its own grounding
Yes, a distribution box includes a grounding system to ensure safety, equipment protection, and system stability.
Purpose of Grounding
The grounding system in a distribution box serves several critical functions: it protects personnel from electric shock, prevents equipment damage from fault currents or surges, and stabilizes system voltage to ensure reliable operation of protective devices like circuit breakers and relays . Proper grounding also facilitates fault detection and isolation, allowing electrical faults to be safely cleared without endangering users or equipment .
Installation Requirements
Each distribution box must be grounded by a qualified electrician. In the US, a 10 AWG (5.26 mm²) ground wire is typically used, while in other markets a 6 mm² wire is standard . The grounding process involves:
- Connecting a ground wire from a threaded stud at the bottom of the housing to the mounting plate.
- Connecting a second ground wire from the mounting plate to the factory central grounding point. The total ground resistance between all system parts should be less than 0.1 Ohm to ensure effective grounding .
Wire Sizing and Resistance Considerations
Depending on the tool cable length and number of spindles, additional grounding wires may be required:
- For long tool cables or multiple spindles, a 16 mm² (US: 6 AWG) wire is used between the mounting plate and spindle plate to maintain low resistance.
- For shorter cables (≤30 m) or multiple spindles grounded together, extra wires may be omitted if the combined resistance remains below safe limits .
Best Practices
- Use high-quality copper or copper-bonded steel conductors to prevent corrosion and maintain long-term reliability .
- Test the grounding system to ensure resistance does not exceed 25 Ohms for safety and compliance .
- Avoid shortcuts like double-tapping neutrals; always use a dedicated ground bar in the cabinet .
Summary
A distribution box is equipped with a dedicated grounding system that connects the enclosure, mounting plates, and equipment to a central ground. This system is essential for safety, equipment protection, and operational stability, and must be installed and tested according to established standards to ensure low-resistance, reliable grounding .
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