PC37.20.2a/D6, Aug 2019 is a standards document focused on clad switchgear amendment 1 for control and secondary circuits and devices, along with all wiring. It addresses the arrangement, coordination, and technical handling of these supporting systems within power equipment, where dependable control and clear wiring practices are important for safe operation and maintainability. For engineers, specifiers, and procurement teams, this standard helps define a more consistent basis for design review and compliance.

PC37.20.2a/D6, Aug 2019 overview

This standard provides amendment guidance tied to clad switchgear, with emphasis on the control and secondary circuits that support switchgear performance. In practical terms, it is concerned with how devices, interconnections, and wiring are organized and documented so the equipment can be installed, tested, and operated with fewer ambiguities. As a technical reference, PC37.20.2a/D6, Aug 2019 is useful when evaluating drawings, wiring details, and circuit integration for medium-voltage switchgear assemblies.

Typical use cases

PC37.20.2a/D6, Aug 2019 is commonly used when specifying or reviewing clad switchgear for utility, industrial, and heavy commercial power systems. It is relevant to control wiring layouts, secondary circuit design, protective device interfaces, and related documentation for switchgear lineups. The standard may also support engineering checks during equipment procurement, factory inspection, and site acceptance work, especially where coordinated control circuits and well-defined wiring practices are needed for dependable operation.

Why this standard matters

This document matters because control and secondary circuits often determine how reliably switchgear can signal, trip, interlock, and communicate status. Clear requirements help reduce wiring errors, improve consistency between manufacturers and projects, and support safer commissioning and maintenance. In addition, PC37.20.2a/D6, Aug 2019 can help teams compare offerings on a technical basis, verify conformance during review, and lower risk in applications where switchgear performance depends on accurate circuit design and device integration.

• Clad switchgear amendment guidance
• Control and secondary circuits
• Devices and wiring requirements
• Documentation and design consistency
• Review support for testing and procurement