What quota should be used for grounding of optical distribution boxes
For grounding optical distribution boxes, a minimum 6 AWG (≈13.3 mm²) copper conductor is recommended, with 10 AWG (≈5.26 mm²) acceptable in some US applications, ensuring a ground resistance below 0.1 ohm.
Recommended Grounding Conductor Size
- US Installations: Use a 10 AWG copper conductor for general grounding of optical distribution boxes, but 6 AWG is preferred to meet both bonding and grounding requirements and comply with NEC 770.100 and ANSI/TIA/EIA-J-STD-607 standards .
- International Installations: A 6 mm² copper conductor is commonly used for grounding optical distribution boxes .
Grounding and Bonding Practices
- Bonding: Connect all metallic parts of the optical distribution box, including cable sheaths and strength members, to a common grounding point to maintain electrical continuity .
- Ground Resistance: Ensure the total resistance between system parts is less than 0.1 ohm to provide effective protection against electrical faults .
- Conductor Routing: The grounding conductor should be as short and straight as practicable, ideally less than 20 feet, to minimize resistance and maintain continuity .
- Connection Points: Attach the conductor from the box's threaded stud to a mounting plate, then from the mounting plate to the building's central grounding point or Primary Bonding Busbar (PBB), .
Compliance and Standards
- Follow NEC Articles 250 and 770, ANSI/TIA-607-D, and ITU-T L.208 recommendations for grounding and bonding of fiber optic enclosures .
- Ensure that all metallic components are electrically bonded to prevent potential differences and provide a safe path for fault currents.
Practical Notes
- For longer tool cables or multiple spindles, consider using a larger conductor (e.g., 6 AWG or 16 mm²) to maintain low resistance in parallel paths .
- Verify that the grounding system integrates with the building's overall grounding infrastructure, including the Primary and Secondary Bonding Busbars, to ensure safety and compliance . By following these guidelines, optical distribution boxes will be safely grounded, minimizing electrical hazards and ensuring compliance with industry standards.
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