IEEE P117/D12, May 2015

P117/D12, May 2015 is a technical standard focused on wound AC electric machinery, with attention to how these machines are designed, built, and assessed in power, energy, and industrial applications. It is most useful where performance, insulation behavior, and material choices affect reliability and operating consistency. For engineers and procurement teams, this standard helps define a clearer basis for specification, testing, and evaluation of machinery used in demanding electrical systems.

Overview of P117/D12, May 2015

P117/D12, May 2015 addresses the technical context of wound AC electric machinery, a category that typically involves rotating equipment with wound electrical components and related dielectric considerations. The standard is relevant where controlled design, consistent construction, and dependable electrical performance are important. In practice, it can support comparison between products, internal engineering requirements, and documentation for compliance-oriented review. As an inactive standard, it remains useful as a reference point for legacy designs and historical specification work.

Typical use cases

This standard may be referenced for wound AC electric machines used in industrial drives, energy systems, or other equipment where electrical winding design and insulation integrity are central concerns. It can also support maintenance specifications, design review, and procurement checks for machinery exposed to load variation, thermal stress, or dielectric demands. In engineering workflows, P117/D12, May 2015 may help align equipment expectations with testing practices and material choices tied to reliable AC machine performance.

Why it matters

P117/D12, May 2015 matters because wound AC electric machinery depends on consistent construction and predictable electrical behavior. Clear technical guidance can reduce risk in design selection, help avoid mismatches in procurement, and improve confidence in testing and acceptance decisions. For organizations working with power and industrial equipment, using a defined standard can support better comparison of products, stronger control of performance expectations, and more reliable handling of insulation- and winding-related requirements. It also provides a useful reference when reviewing older equipment specifications.

• Wound AC electric machinery
• Insulation and dielectric considerations
• Design and performance consistency
• Testing and specification reference
• Legacy or inactive standard lookup