IEEE P693/D9

IEEE P693/D9 is an unapproved draft recommended practice for the seismic design of substations, intended to guide engineering decisions where earthquake resistance is a concern. As part of the Power, Energy and Industry Applications area, it helps define a technical basis for planning, structural detailing, and equipment support in substation environments. IEEE P693/D9 is especially relevant when designers and owners need a consistent reference for reducing seismic risk and supporting reliable operation after ground motion.

About IEEE P693/D9

This draft document addresses seismic design considerations for substations, with attention to the practical demands of power-system facilities and associated equipment. It is a recommended practice rather than a finalized approval document, so it is best viewed as guidance for engineering judgment and design coordination. IEEE P693/D9 may be used to support decisions about structural layout, anchorage, and the interaction between civil works and electrical assets. Its focus is technical consistency in a critical infrastructure setting.

Where is IEEE P693/D9 used?

IEEE P693/D9 is most applicable in substations that may be exposed to earthquake loading, including utility transmission and distribution installations, industrial power yards, and other energy facilities with critical electrical equipment. It can inform design reviews for support structures, racks, enclosures, and connected apparatus where seismic performance affects service continuity. The document is useful during early project design, retrofit planning, and technical evaluation of substation components that must remain stable and functional under dynamic ground movement.

Importance in practice

In practice, IEEE P693/D9 helps teams align seismic design assumptions and reduce uncertainty in substation projects. Using a common recommended practice can improve design control, support procurement requirements, and make review of equipment and support systems more consistent. It may also help limit damage, outage risk, and safety concerns by encouraging attention to anchorage, loads, and structural compatibility. For organizations responsible for critical power infrastructure, IEEE P693/D9 provides a focused reference for managing seismic performance expectations.

• Seismic design guidance for substations
• Draft recommended practice status
• Support for structural and equipment coordination
• Relevant to power and energy applications
• Superseded by P693/D10