IEEE C93.3-1995

C93.3-1995 is a standard for line carrier line traps used in power-system communications and transmission applications. It addresses the technical requirements and performance expectations for equipment that helps separate carrier signals from power-frequency currents on energized lines. For utilities, manufacturers, and engineering teams, this matters because line traps support reliable communication over transmission circuits while helping maintain consistent operation in high-voltage environments. As a superseded document, C93.3-1995 remains useful as a reference for legacy designs and procurement.

C93.3-1995 overview

This technical document focuses on line carrier line traps, a component commonly used in power, energy, and industrial transmission systems. The standard generally helps define how these devices should be designed, rated, and evaluated so they can perform their filtering role on carrier channels without unduly affecting the power system. In practice, C93.3-1995 is relevant to equipment selection, specification review, and engineering comparison where line carrier communication must coexist with normal line operation.

Typical use cases

C93.3-1995 is typically consulted when specifying or reviewing line traps for high-voltage transmission lines that carry carrier-based protection or communication signals. It may be used by utility engineers, relay protection teams, and procurement staff working on substations, line terminals, and grid communication links. The standard is also relevant when assessing replacement equipment for installed systems, checking compatibility with carrier coupling arrangements, or comparing performance requirements across similar line-side devices in power transmission projects.

Why this standard matters

In practice, this standard helps support consistent design and evaluation of line traps, reducing the risk of communication interference or mismatched equipment in carrier-assisted power networks. Clear requirements can improve procurement decisions, testing consistency, and engineering confidence when selecting components for transmission applications. Because line traps sit at the intersection of communications and power delivery, having a common reference like C93.3-1995 can help limit ambiguity and support safer, more dependable system operation.

• Line carrier line trap requirements
• Transmission-line communication applications
• Design and rating reference
• Testing and procurement support
• Legacy superseded standard