Superseded Standard

IEEE 420-1973

IEEE Trial Use Guide for Class 1E Control Switchboards for Nuclear Power Generating Stations

This document applies to all Class IE control switchboards (for example, main control room assemblies, auxiliary panels, local panels or racks, etc) as defined in Section 3, regardless of their application or location. It does not apply to the non-Class IE control switchboards, except as they affect the Class IE control switchboards, but recognizes that Class IE control switchboards may be adjacent to, or joined with, other non-Class IE control switchboards. This document includes, but is not necessarily limited to, design, construction, wiring practices, shipping, handling, storage, installation, testing, and quality assurance. General design practices which are not unique to Class IE control switchboards are not addressed in this document. This document applies to piping systems and Class IE equipment only as they may affect the integrity of the Class IE control switchboard.

Superseded Standard
Superseded by
Board Approval

Working Group Details

Other Activities From This Working Group

Current projects that have been authorized by the IEEE SA Standards Board to develop a standard.

No Active Projects

Standards approved by the IEEE SA Standards Board that are within the 10-year lifecycle.

No Active Standards

These standards have been replaced with a revised version of the standard, or by a compilation of the original active standard and all its existing amendments, corrigenda, and errata.

No Superseded Standards

These standards have been removed from active status through a ballot where the standard is made inactive as a consensus decision of a balloting group.

No Inactive-Withdrawn Standards

These standards are removed from active status through an administrative process for standards that have not undergone a revision process within 10 years.

No Inactive-Reserved Standards
Subscribe to our Newsletter

Sign up for our monthly newsletter to learn about new developments, including resources, insights and more.