The grounding wire in an OPGW splice box connects the optical ground wire to the tower's grounding system, ensuring electrical safety while maintaining fiber integrity.

Purpose of the Grounding Wire

The grounding wire in an optical cable splice box, particularly for OPGW, serves to safely conduct electrical currents, such as lightning strikes or fault currents, from the optical ground wire to the tower's grounding system. This protects both personnel and equipment while preserving the optical fibers' performance .

Connection Method

1. Bonding Clamp Installation: A bonding clamp is used to attach the OPGW cable to the tower's grounding wire. The clamp is typically made of aluminum and may have one or two bolts depending on the application .
2. Downlead Clamps: These guide the OPGW from the top of the tower to the splice box, ensuring proper spacing and preventing mechanical stress on the cable .
3. Splice Enclosure Integration: The splice box (e.g., AFL SB01 or GL FIBER junction box) is mounted on the tower or pole. It has ports for the OPGW cable and may include a dedicated grounding point where the bonding clamp connects the cable's metallic sheath to the tower ground .

Installation Considerations

• Safety First: Establish an equal potential zone using temporary ground cables and protective equipment to prevent electrical hazards during installation .
• Mechanical Stability: Ensure the cable is properly clamped and tensioned to avoid bending stress or vibration damage, which could affect both the grounding and optical performance .
• Environmental Protection: The splice box should be weatherproof, leakproof, and corrosion-resistant to maintain long-term grounding and fiber protection .

Summary

The grounding wire in an OPGW splice box is a critical component that links the cable's metallic elements to the tower's grounding system. Proper installation involves using bonding clamps, downlead clamps, and a secure splice enclosure to ensure both electrical safety and optical fiber integrity .