IEC 62058-11-2008 PDF

Full title and description

Electricity metering equipment (AC) - Acceptance inspection - Part 11: General acceptance inspection methods. IEC 62058-11:2008 defines general procedures and statistical sampling methods for acceptance inspection of newly manufactured alternating-current electricity meters supplied in lots of 50 units or more. It standardizes lot-by-lot inspection, isolated-lot and skip-lot procedures, 100% inspection options and the use of attribute and variable sampling plans to assess conformity between manufacturer and purchaser.

Abstract

IEC 62058-11:2008 provides general acceptance inspection methods applicable to AC electricity meters delivered in batches (lots) of 50 or greater. The standard references ISO sampling practice (ISO 2859 series), specifies inspection modes (lot-by-lot by attributes or variables, isolated lot, skip‑lot and 100% inspection), establishes criteria for switching between normal/tightened/reduced inspection, and includes normative annexes on random number usage and statistical parameter calculation. It is intended to be used by manufacturers, purchasers, test laboratories and conformity assessment bodies to support quality control and regulatory conformity assessment (including use within the Measuring Instruments Directive framework where adopted).

General information

• Status: Published (international standard, active publication).
• Publication date: 18 September 2008.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.220.20 (Measurement of electrical and magnetic quantities); 91.140.50 (Electricity supply systems).
• Edition / version: Edition 1.0 (2008).
• Number of pages: 163 pages.

Scope

This part of IEC 62058 specifies general acceptance inspection methods for newly manufactured electricity metering equipment (a.c.) supplied in lots of 50 units or more. It sets out the sampling schemes, inspection procedures and statistical rules to be applied when assessing batches between manufacturer and purchaser. Methods for smaller lots are to be agreed between the parties. The standard is applicable to both electromechanical and static meters when used together with the particular-part documents of the IEC 62058 series.

Key topics and requirements

• Definitions, normative references and alignment with ISO sampling practice (ISO 2859 series) for attribute sampling.
• Lot-by-lot inspection by attributes and by variables, including single and double sampling plans and AQL-based plans (AQL = 1.0 examples used).
• Procedures for isolated-lot inspection, skip-lot inspection and rules for switching between normal, tightened and reduced inspection.
• Guidance and requirements for 100% inspection where appropriate and how it relates to statistical plans.
• Statistical methods for inspection by variables using the σ method (replacement of older “R” method).
• Classification and treatment of nonconformities, acceptance criteria and operating characteristic considerations (producer/consumer risks).
• Normative annexes covering random number generation and calculation of statistical parameters (e.g., sample standard deviation).
• Support for conformity assessment frameworks — used to demonstrate conformity with measuring instruments regulations when adopted regionally (for example European MID adaptations).

Typical use and users

Primary users include electricity meter manufacturers (incoming/outgoing quality control), procurement and purchasing departments, utilities and distribution companies performing acceptance testing on received meter lots, independent test laboratories, certification and conformity assessment bodies, and regulators or inspection authorities overseeing compliance of measuring instruments. The standard is used to agree inspection plans between supplier and purchaser and to integrate sampling inspection into quality-management and verification processes.

Related standards

IEC 62058-11 is part of the IEC 62058 acceptance-inspection series. Closely related parts include IEC 62058-21:2008 (particular requirements for electromechanical meters) and IEC 62058-31:2008 (particular requirements for static meters). IEC 62058-11:2008 cancels and replaces earlier standards such as IEC TS 60514 and IEC 61358. In Europe the text has been adopted/modified as EN 62058-11:2010 (and national adoptions such as DIN EN 62058-11), and the particular-part documents are also available in EN-adopted forms (EN 62058-21, EN 62058-31). The standard references ISO 2859 (sampling procedures) and other IEC/ISO statistical guidance documents.

Keywords

acceptance inspection, electricity metering equipment, sampling plans, lot inspection, ISO 2859, AQL, skip-lot, isolated lot, 100% inspection, statistical quality control, electromechanical meters, static meters, IEC 62058 series

FAQ

Q: What is this standard?

A: IEC 62058-11:2008 is an international standard titled "Electricity metering equipment (AC) - Acceptance inspection - Part 11: General acceptance inspection methods" that specifies general procedures for acceptance inspection of newly manufactured AC electricity meters supplied in lots of 50 or more. It was published by IEC on 18 September 2008.

Q: What does it cover?

A: It covers sampling schemes and inspection procedures (lot-by-lot by attributes or variables, isolated-lot, skip-lot and 100% inspection), statistical acceptance criteria and rules for switching inspection levels, classification of nonconformities, record-keeping and normative annexes on random numbers and statistical calculations. It is intended to be used together with particular-part documents for meter types.

Q: Who typically uses it?

A: Meter manufacturers, utilities and meter purchasers, independent test laboratories, certification and conformity-assessment bodies, and regulators use the standard to define and execute acceptance inspections and to agree inspection plans between suppliers and purchasers.

Q: Is it current or superseded?

A: IEC 62058-11 was published on 18 September 2008 (Edition 1.0). As published on the IEC webstore the document was assigned a maintenance/stability date in IEC records; regional adoptions (for example EN 62058-11:2010) exist. Users should check the IEC or their national standards body for any amendments, revisions or newer editions beyond the 2008 text before relying on it for compliance or regulatory purposes.

Q: Is it part of a series?

A: Yes. It is Part 11 of the IEC 62058 series (acceptance inspection). Other parts in the series include Part 21 (particular requirements for electromechanical meters) and Part 31 (particular requirements for static meters), among others that address specific meter types and acceptance-test details.

Q: What are the key keywords?

A: Acceptance inspection, sampling, AQL, lot inspection, electricity meter, IEC 62058, ISO 2859, skip-lot, isolated lot, 100% inspection, statistical quality control.