IEEE 1138-1994

IEEE 1138-1994 is a standard for the construction of composite fiber optic groundwire (OPGW) used on electric utility power lines. It addresses the engineering and material considerations needed to combine grounding and optical communication functions in a single overhead line component. For utilities and related suppliers, this standard matters because it helps define a consistent basis for design, procurement, and technical evaluation of OPGW intended for power transmission environments.

Overview of IEEE 1138-1994

This standard focuses on the construction requirements for composite fiber optic groundwire systems, which are commonly installed on overhead electric utility lines. IEEE 1138-1994 is relevant where power, energy, and communications needs intersect, since OPGW must support both lightning protection or grounding duties and optical signal transmission. The document provides a technical reference for comparing product designs and aligning equipment specifications with expected service conditions on utility transmission infrastructure.

Typical use cases

IEEE 1138-1994 is typically used when specifying OPGW for new transmission corridors, line upgrades, or replacement projects on electric utility power lines. It is relevant to utility engineers, cable manufacturers, and procurement teams evaluating composite overhead groundwire designs for integrated fiber optic communication links. The standard may also support planning for substation-to-substation communications, utility network backbones, and other overhead line applications where physical line protection and communications capability are both required.

Why it matters

Using a defined standard helps reduce uncertainty in design and purchasing decisions for OPGW systems. IEEE 1138-1994 supports more consistent expectations for construction, materials, and performance-related features, which can improve compatibility across projects and suppliers. For utilities, that consistency may help limit installation risk, simplify technical review, and support safer, more reliable overhead line communications and grounding arrangements. As a superseded standard, it is also useful for legacy specification reference and document review.

• Composite fiber optic groundwire construction
• Overhead electric utility line applications
• Grounding and optical communication integration
• Utility design and procurement reference
• Legacy technical specification use