IEEE P1115a/D4, Feb 2007

P1115a/D4, Feb 2007 is an inactive technical document focused on cadmium batteries for stationary applications, with Amendment 1 adding discussion on sizing margins. It is relevant where battery capacity planning, reserve margin, and application-specific performance need to be considered in stationary power systems. For engineers working with power and energy equipment, this standard can help frame design assumptions and clarify how sizing guidance should be interpreted in relation to operating conditions and reliability expectations.

Overview of P1115a/D4, Feb 2007

P1115a/D4, Feb 2007 addresses cadmium battery use in stationary service, with particular attention to additional discussion on sizing margins. In practical terms, it supports technical review of how a battery string should be sized to meet expected load, duty cycle, and backup requirements. The document is most relevant to design and engineering decisions where consistent capacity planning is important, especially in systems that depend on stable stored energy rather than frequent cycling or portable operation.

Typical use cases

This standard is typically consulted for stationary battery installations used in power continuity and control applications, where cadmium battery performance and reserve capacity may affect system readiness. It may be useful during battery bank selection, load assessment, and margin review for industrial power equipment, substations, control rooms, and other fixed installations. P1115a/D4, Feb 2007 is also relevant when documenting sizing assumptions for procurement, specification review, or maintenance planning in engineered electrical systems.

Why it matters

P1115a/D4, Feb 2007 matters because sizing margins can strongly influence whether a stationary battery system performs as intended under real operating conditions. Clear discussion of margin selection helps reduce under-sizing risk, supports more consistent design decisions, and improves comparability during specification or compliance review. For projects involving cadmium batteries, the standard can aid technical coordination between design, testing, and procurement teams by making capacity expectations and application limits easier to align.

• Cadmium batteries for stationary service
• Additional sizing margin discussion
• Capacity planning and reserve assessment
• Electrical design and procurement support
• Inactive English-language standard