IEEE 1138-2021

IEEE 1138-2021 is the standard for testing and performance of optical ground wire (OPGW) used on electric utility power lines. It addresses how this combined grounding and fiber-optic cable should be evaluated for mechanical, electrical, and environmental performance, helping utilities and suppliers compare products with a common technical basis. For transmission systems that rely on OPGW for both grounding and communications, the standard supports more consistent design decisions, procurement, and quality verification.

About IEEE 1138-2021

This technical document focuses on the test methods and performance expectations for OPGW in overhead power-line applications. IEEE 1138-2021 is relevant where the cable must carry fault current as a ground wire while also protecting embedded optical fibers used for communications and monitoring. The standard helps define how the product should be assessed for durability, electrical integrity, and service suitability, making it a practical reference for engineering review, acceptance testing, and specification work.

Where is IEEE 1138-2021 used?

IEEE IEEE 1138-2021 is commonly used in electric utility transmission projects that install optical ground wire on high-voltage lines. It is useful for line design, cable selection, factory testing, and project procurement when the same overhead conductor must provide shielding and fiber-optic communication capability. Engineers, utilities, and manufacturers may consult it when evaluating OPGW performance for span loading, grounding function, and long-term reliability in power network environments.

Importance in practice

In practice, this standard helps reduce uncertainty when specifying and qualifying OPGW for utility networks. It supports more consistent testing and performance evaluation, which can improve design control and procurement confidence. Using IEEE 1138-2021 can also help align product expectations across suppliers, reduce installation and operating risk, and provide a clearer basis for acceptance of fiber-bearing grounding conductors in demanding overhead line service. That consistency is valuable for both reliability and lifecycle planning.

• OPGW testing and performance
• Overhead electric utility power lines
• Grounding and optical fiber functions
• Mechanical, electrical, and environmental checks
• Utility specification and acceptance support