What is strictly prohibited when there is a fiber optic cable underneath

Excavating, applying excessive tension, bending beyond limits, or exposing fiber ends to laser light are strictly prohibited when a fiber optic cable is buried underground.

Excavation and Digging Restrictions

Digging or trenching directly above or near a buried fiber optic cable without proper location verification is strictly prohibited. Underground fiber cables are typically buried 18–48 inches deep depending on local regulations and site conditions, and accidental digging can sever the cable, causing service outages and costly repairs . Always use utility location services and follow local municipal codes before any excavation.

Mechanical Stress and Cable Handling

Fiber optic cables are sensitive to mechanical stress. It is prohibited to:

• Exceed the maximum tensile strength of the cable during pulling or installation, as this can damage the fibers and reduce service life .
• Bend the cable below its minimum bending radius, which can cause signal loss or fiber breakage .
• Apply sudden jerks or frequent starts and stops when pulling the cable through conduits .

Exposure to Optical Radiation

Never look directly into the end of a fiber optic cable connected to a laser or LED, as the invisible light can cause serious retinal damage . Using magnifying lenses to view fiber ends is also prohibited.

Environmental and Safety Precautions

• Avoid placing heavy objects or driving machinery over areas where fiber cables are buried, especially if the conduit is shallow .
• Do not attempt to repair or splice the cable without proper training and protective equipment, as improper handling can compromise network performance and safety .
• In hazardous environments, ensure fiber cables are routed through conduits or armored protection to prevent exposure to flammable gases or dust .

Summary

Strictly prohibited actions include unauthorized digging, exceeding cable tension, bending below minimum radius, direct exposure to laser light, and improper handling in hazardous areas. Following these precautions ensures the integrity of the fiber optic network, prevents service disruptions, and protects personnel from injury .