IEEE 693-2018

IEEE 693-2018 is the recommended practice for seismic design of substations, providing guidance for engineering components, circuits, devices, and systems that must perform under earthquake conditions. It addresses how substation equipment and supporting structures can be designed and evaluated for seismic resilience, helping reduce damage and service interruption. For power and energy applications, this standard is important where reliable operation, structural integrity, and safety must be considered alongside geoscience-related seismic risk.

IEEE 693-2018 overview

This technical document focuses on the seismic design of substation facilities and the equipment installed within them. IEEE 693-2018 is used to guide engineers in selecting, designing, and assessing substation components so they can better withstand earthquake loading and related dynamic effects. The standard is relevant to utility and industrial power installations where electrical continuity and equipment survivability are important. It supports consistent engineering practice by connecting seismic considerations with practical substation design requirements.

Typical use cases

This standard is commonly used when planning or reviewing substations that include transformers, switchgear, insulators, control equipment, and other power-system hardware exposed to seismic hazard. It may also support design decisions for new installations, retrofits, and equipment qualification work tied to substation resilience. Engineers, asset owners, and procurement teams can use IEEE 693-2018 to align seismic performance expectations for critical electrical infrastructure in power transmission and distribution environments.

Why this standard matters

Seismic design requirements can have a direct effect on safety, reliability, and recovery time after an earthquake. IEEE 693-2018 helps reduce uncertainty by giving a recognized basis for engineering decisions, testing expectations, and specification writing. It can improve consistency between design teams, equipment suppliers, and project requirements while supporting risk reduction for critical substation assets. In practice, that makes it easier to compare equipment, document compliance, and plan for performance under seismic conditions.

• Seismic design guidance for substations
• Equipment and system resilience under earthquake loading
• Useful for power, energy, and industrial electrical assets
• Supports design review, qualification, and procurement