IEC 62058-21-2008 PDF

Full title and description

St IEC 62058-21:2008 — Electricity metering equipment (AC) — Acceptance inspection — Part 21: Particular requirements for electromechanical meters for active energy (classes 0,5, 1 and 2). This part of IEC 62058 specifies the specific tests, sampling and acceptance criteria to be used when performing acceptance inspection of newly manufactured direct-connected or transformer-operated electromechanical watt‑hour meters delivered in lots (typically >50 units).

Abstract

IEC 62058-21:2008 defines the particular requirements and test procedures for lot acceptance inspection of electromechanical active‑energy meters. It complements the general inspection methods in IEC 62058-11 by listing required tests (visual checks, AC voltage withstand, no‑load, starting, accuracy points, register verification and other mechanical checks), sampling plans, acceptance criteria and record‑keeping formats for evaluation of meter lots.

General information

• Status: Valid / published international standard (in force; maintained).
• Publication date: 18 September 2008.
• Publisher: International Electrotechnical Commission (IEC), TC 13: Electrical energy measurement and control.
• ICS / categories: 17.220.20; 91.140.50 (measurement of electrical quantities; electricity supply systems).
• Edition / version: Edition 1.0 (2008).
• Number of pages: 29 pages.

Scope

This part applies to acceptance inspection of newly manufactured electromechanical alternating‑current meters for active energy of accuracy classes 0.5, 1 and 2. It covers direct‑connected and transformer‑operated meters supplied in lots (the standard addresses typical sampling plans for lots above 50 units; procedures for smaller lots should be agreed between manufacturer and purchaser). The document is intended primarily for manufacturer–purchaser acceptance inspections but may also support initial verification and other quality checks.

Key topics and requirements

• Specified inspection and test sequence for lot acceptance (visual checks, pre‑conditioning, electrical and mechanical tests).
• Detailed test procedures: AC voltage withstand, no‑load condition, starting/current to start, accuracy tests at defined points, register increment verification.
• Reference and test conditions (voltage, frequency, temperature, loading and measurement uncertainty considerations).
• Sampling and acceptance schemes: attribute and variable inspection methods, single/double sampling, lot‑by‑lot and isolated lot procedures with defined AQL/LQ values.
• Criteria for lot acceptance, non‑acceptance and disposal of unacceptable lots; handling when different tests require different sample sizes.
• Test record formats and evaluation sheets to document inspection results and conformity decisions.
• Allowance for additional agreed tests (mechanical integrity, register meshing, solder/weld quality, contaminants in air‑gaps, etc.).

Typical use and users

Primary users are meter manufacturers, purchasing departments of utilities and distribution companies, independent test laboratories, conformity assessment bodies and metrology institutes. The standard is used during production acceptance testing, pre‑delivery inspection, supplier quality control, and by utilities to verify that delivered lots meet contractual accuracy and mechanical requirements.

Related standards

IEC 62058-21 is part of the IEC 62058 series on acceptance inspection and is intended to be used with IEC 62058-11 (general acceptance inspection methods). It replaces earlier guidance in IEC TS/IEC TR 60514 on acceptance inspection. Related standards and documents include IEC 62053 series (performance and accuracy classes for electricity meters), national/adopted variants (for example EN 62058-21), and measurement uncertainty guidance such as the ISO/IEC Guide on the expression of uncertainty in measurement (GUM).

Keywords

electromechanical meter, acceptance inspection, electricity metering equipment (AC), active energy, lot acceptance, sampling plan, accuracy classes 0.5/1/2, starting test, register verification, IEC 62058, meter testing.

FAQ

Q: What is this standard?

A: IEC 62058-21:2008 is an international standard that specifies particular requirements and test procedures for acceptance inspection of electromechanical alternating‑current active‑energy meters (accuracy classes 0.5, 1 and 2).

Q: What does it cover?

A: It covers pre‑inspection checks, electrical and mechanical tests (including AC voltage tests, no‑load, starting and defined accuracy test points), sampling plans for lot acceptance, criteria for acceptance/non‑acceptance, and test record requirements for meter lots delivered by the manufacturer.

Q: Who typically uses it?

A: Meter manufacturers, utility procurement and quality teams, test houses, conformity assessors and metrology bodies use the standard to verify production lots meet specified accuracy and mechanical requirements before acceptance.

Q: Is it current or superseded?

A: Published 18 September 2008 (Edition 1.0) and maintained as part of the IEC 62058 series. It remains the published Part 21 document and is maintained under IEC procedures; users should check national adoption or later revisions for the most recent status, but the published edition is the authoritative text for Part 21.

Q: Is it part of a series?

A: Yes. IEC 62058-21 is Part 21 of the IEC 62058 series on acceptance inspection of electricity metering equipment (AC). It is intended to be used together with IEC 62058-11 (general acceptance inspection methods) and other parts of IEC 62058 that cover specific meter types and inspection topics.

Q: What are the key keywords?

A: electromechanical meter, acceptance inspection, active energy, accuracy classes, lot sampling, register verification, starting test, IEC 62058-21.