IEEE Std C57.12.35-2024 PDF

Full title and description

IEEE Standard for Information Coding for Distribution Transformers and Step-Voltage Regulators — establishes information-code (bar code/QR and related symbology) requirements, data content, print quality and durability for temporary and permanent labels used on distribution transformers and step-voltage regulators.

Abstract

Revision standard (active). Covers bar code label requirements for specific types of distribution transformers and step-voltage regulators, describing required data content for temporary and permanent labeling as well as label symbology, layout, print quality and durability expectations. The standard assumes supporting user databases so encoded information may be limited to basic identification.

General information

• Status: Active Standard.
• Publication date: Published August 2, 2024 (Board approval: June 6, 2024).
• Publisher: IEEE (IEEE Standards Association / Power & Energy Society).
• ICS / categories: Transformers; Automatic identification/data capture — commonly cited ICS codes include 29.180 (Transformers. Reactors) and 35.040.50 (Automatic identification and data capture techniques).
• Edition / version: IEEE Std C57.12.35-2024 (supersedes IEEE Std C57.12.35-2013).
• Number of pages: 26 pages (standard PDF).

Scope

This standard sets forth information-code requirements for overhead, pad‑mounted and subsurface distribution transformers and step‑voltage regulators. It includes requirements for data content (what minimum identification must be encoded), symbology and layout options, and life‑expectancy/print‑durability criteria for labels intended to remain legible in typical utility environments. The document is intended for use where a user database exists so codes need only carry basic identification data.

Key topics and requirements

• Required data elements for temporary and permanent information codes (identifiers, model/serial data and minimal metadata).
• Approved symbologies and encoding practices (bar code and 2D code options appropriate for outdoor equipment).
• Label layout guidance and human-readable accompaniment to machine-readable codes.
• Print quality, verification and life‑expectancy/durability requirements for utility environments (exposure, abrasion, solvents, UV).
• Distinctions between temporary (factory/test) and permanent (field) labeling and related data-content considerations.
• Assumption of supporting asset/databases — the standard focuses on identification coding and not the full asset‑management data model.

Typical use and users

Used by transformer manufacturers, utility asset-management teams, meter and tagging suppliers, field crews, and procurement/inspection personnel to ensure consistent, durable machine‑readable identification for distribution transformers and step‑voltage regulators. The standard supports lifecycle tracking, commissioning, testing, and maintenance workflows that rely on automated identification.

Related standards

Related IEEE and industry documents include the prior C57.12.35 editions (2013 and earlier), IEEE C57.12.80 (terminology for transformers), and other C57 series documents addressing distribution transformer requirements, test data reporting and product families (for example C57.12.34, C57.12.37 and C57.12.210). Organizations implementing this coding standard typically coordinate it with applicable asset‑reporting, test and purchase‑spec standards.

Keywords

information coding, bar code, QR code, 2D code, distribution transformer, step‑voltage regulator, label durability, symbology, asset identification, automatic identification and data capture.

FAQ

Q: What is this standard?

A: IEEE Std C57.12.35-2024 is the IEEE Standard for Information Coding for Distribution Transformers and Step‑Voltage Regulators, providing requirements for bar/2D code labeling and associated data content and durability.

Q: What does it cover?

A: It covers the required data elements to encode on transformer/regulator labels, accepted code symbologies and layout, print quality/verification, and durability/life‑expectancy criteria for both temporary and permanent labels. It assumes the existence of user databases so codes may carry only basic identification.

Q: Who typically uses it?

A: Transformer manufacturers, utilities (asset management, inspection, field crews), label suppliers, and organizations that integrate asset‑tracking and maintenance systems.

Q: Is it current or superseded?

A: Current — published August 2, 2024, and listed as an active IEEE standard. It supersedes IEEE Std C57.12.35‑2013.

Q: Is it part of a series?

A: Yes — it is part of the IEEE C57 family of standards addressing power and distribution transformers (nomenclature, product requirements, testing and reporting). Implementers commonly reference other C57 documents for complementary requirements.

Q: What are the key keywords?

A: Bar code, QR code, information coding, distribution transformer, step‑voltage regulator, automatic identification, label durability, symbology, asset identification.