IEC 62052-31:2015

Overview

IEC 62052-31:2015 - Electricity metering equipment (AC) Part 31 - specifies the product safety requirements and tests for AC electrical energy metering and control equipment. It applies to newly manufactured meters and load/tariff control devices designed for 50 Hz or 60 Hz networks up to 600 V where all functional elements (including add‑on modules) are enclosed in or form a single case. The standard also covers relevant auxiliary input and output circuits and includes Interpretation Sheet 1 (2019) clarifications.

Key topics and requirements

• Scope and applicability: Safety requirements for self‑contained meters and equipment installed in a specified matching socket (tests performed when installed in that socket). Socket design and meter insertion/removal are outside scope.
• Protection against electrical shock: Determination of accessible parts, classification of hazardous live (HLV) circuits, and insulation requirements.
• Insulation and overvoltage classification (OVC): Basis for clearance and creepage dimensions uses OVC III for mains circuits; Interpretation Sheet allows some auxiliary circuits to be designed and marked for OVC II when justified and documented.
• Tests and test conditions: Type‑test sequences, reference atmospheric and state conditions, single‑fault testing, long‑term overvoltage and impulse withstand tests.
• Information, marking and documentation: Label durability, marking of circuits (especially those not designed for OVC III), installation and user manuals, commissioning and maintenance instructions.
• Specific clarifications from Interpretation Sheet 1: insulation between current/voltage/auxiliary circuits, when current transformer (CT) secondary circuits are considered earthed (ELV), and applicability of long‑term overvoltage tests to auxiliary supplies.

Applications and who uses it

IEC 62052-31 is essential for:

• Meter manufacturers designing and certifying AC electricity meters and load/tariff control devices.
• Test laboratories and certification bodies performing safety type tests and issuing compliance reports.
• Utilities and procurement teams specifying safety requirements in tenders and acceptance testing.
• Installers and maintenance personnel who rely on the standard’s installation, marking and safety guidance.
• Standards committees and regulatory authorities referencing product safety norms for grid‑connected metering.

Related standards and practical value

IEC 62052-31 links with other IEC standards (e.g., insulation, EMC and equipment‑specific standards) and may reference requirements from IEC 61010, IEC 60364 and relevant communication port standards. Use IEC 62052-31 to ensure meter safety design, compliance testing, correct documentation and safe field installation - reducing risk, easing certification and improving interoperability.