IEEE 738-1993

738-1993 is a technical standard for the temperature of bare overhead conductors, set within power, energy and industry applications. It addresses how conductor temperature should be understood and managed in service, helping engineers and operators evaluate thermal limits, operating conditions, and related performance concerns. As a superseded standard, it remains useful for reference work, legacy systems, and technical comparisons where historical requirements still matter.

Overview of 738-1993

This standard focuses on the thermal behavior of bare overhead conductors used in electrical transmission and distribution contexts. In practice, 738-1993 helps define the temperature-related expectations that affect conductor rating, sag, and operating reliability. For power-system work, that kind of guidance is important when assessing line performance under changing load and environmental conditions. It supports more consistent engineering decisions by giving a defined reference for temperature considerations.

Typical use cases

738-1993 is commonly used when reviewing overhead line design, checking thermal performance, or comparing conductor behavior against established criteria. It may support utilities, consultants, and equipment planners working with bare conductors in grid infrastructure, substation connections, and line upgrades. The standard is also relevant during technical review of rating studies, inspection findings, and legacy documentation where conductor temperature assumptions need to be traced back to a formal reference.

Why it matters

Temperature control is central to safe and dependable overhead conductor operation, which is why 738-1993 matters in real-world engineering work. Clear thermal guidance can help reduce the risk of overstressing conductors, support more consistent capacity decisions, and improve documentation for compliance and procurement. For organizations maintaining older assets, the standard can also provide a useful benchmark for testing, verification, and comparison with later requirements. Its value is especially strong in controlled design and review workflows.

• Bare overhead conductor temperature guidance
• Power and energy applications
• Legacy reference for superseded requirements
• Line rating and thermal review support
• Useful for design, testing, and documentation