S-02—Implementation schedule for the application of statistical sampling requirements in S-S-01, S-S-02, S-S-03, S-S-04 and S-S-06

Category: Statistical method
Bulletin: S-02 (rev. 4)
Document(s): S-01; S-S-01; S-S-02; S-S-03; S-S-04; LMB-EG-04; PS-S-01; S-G-02; S-E-02
Issue date: 2011-02-11
Effective date: 2011-02-11
Supersedes: S-02 (rev. 3)


Table of contents


1.0 Purpose

This bulletin identifies Measurement Canada's (MC) statistical sampling plans and related specifications applicable to the verification and reverification of electricity and gas meters, and communicates a comprehensive schedule for the implementation of these requirements.

2.0 References

2.1 Bulletin S-01 – Implementation Guide for the Application of Statistical Sampling Requirements

2.2 S-S-01 – Specifications for Random Sampling and Randomization

2.3 S-S-02 – Measurement Uncertainty and Meter Conformity Evaluation Specifications

2.4 S-S-03 – Prerequisites to the Use of Sampling Inspection

2.5 S-S-04 – Sampling Plans for the Inspection of Isolated Lots and Short Series of Lots

2.6 S-S-06 – Sampling Plans for the Inspection of Isolated Lots of Meters in Service

2.7 LMB-EG-04, Part 1 – Statistical Sampling Plans for the Verification and Reverification of Electricity and Gas Meters (with Amendments No. 1– 4)

2.8 PS-S-01 – Provisional Specifications for the Processing and Analysis of Defective Meters Discovered during Compliance Sampling (an amendment to LMB-EG-04)

2.9 S-G-02 – Specifications for the Verification and Reverification of Diaphragm Meters

2.10 S-E-02 – Specifications for the Verification and Reverification of Electricity Meters

2.11 P-EG-01 – Electricity & Gas Measurement Dispute Investigation Procedure

3.0 Terminology

Acceptance sampling

The process of accepting or rejecting a lot of meters by inspecting a sample in accordance with a predetermined sampling plan. The object is to ensure that lots of acceptable quality have a high probability of acceptance.

Compliance sampling

A specialized form of acceptance sampling of isolated lots of meters in service, having the object of ensuring that lots of unacceptable quality have a high probability of rejection.

4.0 Implementation schedule for electricity meters

4.1 Electro mechanical (energy-only) electricity meters

4.1.1 Measurement uncertainty specifications—S-S-02

Prior to the implementation of 100% inspection or acceptance sampling of the meters identified in 4.1, all of the associated measurement uncertainties (i.e. those associated with the measuring apparatus and meter) must first be determined, as per the requirements of S-S-02 and the guidelines in Bulletin S-01.

4.1.2 Acceptance sampling

4.1.2.1

Application of the meter verification specifications in S-E-02 , Annex A (required for the use of the new specifications in S-S-01, S-S-03 and S-S-04) for the meters identified in 4.1 shall become mandatory effective January 1st, 2012.

4.1.2.2

The determination of the measurement uncertainties established pursuant to the specifications in S-S-02 required to support the verification or reverification of the aforementioned meters shall be completed and authorized by MC by June 1, 2011.

Note: Throughout this document S-E-02 refers to the latest published version of that document.

4.1.2.3 Isolated lots and short series of lots

The use of specifications S-S-01, S-S-03, and S-S-04 for the verification or reverification of the meters identified in 4.1 shall become mandatory effective January 1, 2012. Until this date, acceptance sampling specification LMB-EG-04 may continue to be applied on a temporary basis.

4.1.3 Compliance sampling

4.1.3.1

As of January 1, 2011, S-S-06 may be applied for the reverification of electromechanical meters by compliance sampling. Alternatively LMB-EG-04 may continue to be used for the reverification of the aformentioned meters until December 31, 2013. As of January 1, 2014, LMB-EG-04 will be rescinded and S-S-06 will be the only specification authorized for use in the inspection of isolated lots of meters in service.

4.1.3.2

A mandatory implementation date for the application of the uncertainty requirements in specification S-S-02 for the reverification of the aforementioned in service meters by compliance sampling under specification S-S-06, has not been set.

4.1.4 100% Inspection

4.1.4.1

Use of existing inspection methods under S-E-02 (with the exception of Annex A) for the verification or reverification of the aforementioned meters by 100% inspection may continue to be used until December 31st, 2011. As of January 1st, 2012 , S-E-02 (including Annex A) and S-S-02 shall be applied in support of the use of measurement uncertainty in conformity assessment.

4.2 Electronic meters with or without advanced functions

4.2.1 Measurement uncertainty specifications—S-S-02

4.2.1.1

Prior to implementation of 100% inspection or acceptance sampling of the meters identified in 4.2, all of the associated measurement uncertainties (i.e. those associated with the measuring apparatus and meter) must first be determined, as per the requirements of S-S-02 and the guidelines in Bulletin S-01.

4.2.2 Acceptance sampling

4.2.2.1

The application of the meter verification specifications in S-E-02, Annex A (required for the use of the new specifications in S-S-01, S-S-03, and S-S-04) for the meters identified in 4.2 is mandatory effective July 1st, 2009.

4.2.2.2 Isolated lots and short series of lots

Use of specifications S-S-01, S-S-03 and S-S-04 for the verification or reverification of the meters identified in 4.2 is mandatory effective July 1st, 2009.

4.2.3 Compliance sampling

4.2.3.1

Compliance sampling specification PS-S-04 was rescinded on December 31, 2010. As of January 1, 2011, S-S-06 is the only specification authorized for use in the inspection of isolated lots of electronic electricity meters in service.

4.2.3.2

A mandatory implementation date for the application of the uncertainty requirements in specification S-S-02 for the reverification of the aforementioned in service meters by compliance sampling has not been set at this time.

4.2.4 100% Inspection

4.2.4.1

The application of the specifications in S-E-02, Annex A and the uncertainty requirements of specification S-S-02 for the verification or reverification of the aforementioned meters, is mandatory effective July 1st, 2009.

4.3 Other electricity meters

4.3.1 Measurement uncertainty specifications—S-S-02

A mandatory implementation date for the application of the uncertainty requirements in specification S-S-02 for the verification or reverification of the meters identified in 4.3 has not been set at this time.

4.3.2 Acceptance sampling

Acceptance sampling is not currently authorized for hybrid-type electricity meter types or other electricity meters not identified in sections 4.1 to 4.2. Once MC has authorized revised meter specification requirements in S-E-02 to support the use of acceptance sampling under S-S-04, Accredited Meter Verifiers (AMVs) may then submit a request to MC for expansion of scope of their accreditation program to implement acceptance sampling using the new specifications in S-S-01, S-S-03 and S-S-04.

4.3.3 Compliance sampling

Compliance sampling inspection is not currently authorized for hybrid-type electricity meter types or other electricity meters not identified in sections 4.1 to 4.2. Once MC has authorized revised meter specification requirements in S-E-02 (required to support the use of compliance sampling specifications currently under development), AMVs may then submit a request to MC for expansion of scope of their accreditation program to implement compliance sampling for the reverification of these meters.

4.3.4 100% Inspection

4.3.4.1

Use of the existing inspection method under S-E-02 (with the exception of Annex A) for the verification or reverification of the aforementioned meters by 100% inspection shall continue until MC has authorized revised meter specification requirements in S-E-02 required to support the use of measurement uncertainty in conformity assessment of the aforementioned meters.

5.0 Implementation schedule for gas meters

5.1 Diaphragm meters

5.1.1 Measurement uncertainty specifications—S-S-02

5.1.1.1

Prior to the implementation of 100% inspection or acceptance sampling of the meters identified in 5.1, all of the associated measurement uncertainties (i.e. those associated with the measuring apparatus, proving process, and meter) must first be determined, as per the requirements of S-S-02 and the guidelines in Bulletin S-01. Where such measurement uncertainty values have not been determined, gas organizations will need to implement the following default uncertainty value:

  • Default combined uncertainty value (i.e. based on 1 standard deviation) is 0.267% and the extended values are 0.44% (k = 1.6449) and 0.80% (k = 3.0000). The application of this value results in a test limit (TL) value of +/- 0.80% and under sampling inspection the uncertainty value of 0.44% applies.

5.1.1.2

Organizations may use the default uncertainty value prescribed in 5.1.1.1 until the actual measurement uncertainty values are determined and authorized by MC. Once the actual measurement uncertainty value is authorized, this value shall be used for meter verification or reverification.

5.1.2 Meter verification and reverification specifications—S-G-02

5.1.2.1

The applicable requirements in specification S-G-02 (related to the use of the new specifications in S-S-01,

S-S-03 and S-S-04) for the meters identified in 5.1 is mandatory effective July 1st, 2008.

Note: Throughout this document, S-G-02 refers to the latest published version of that document.

5.1.2.2 Median absolute deviation from target (MADT) limit

The applicable MADT limit value specified in S-G-02 section 6.3.9.2 for 100% inspection of large diaphragm gas meters is 0.80 until December 31st, 2015. On January 1st, 2016, the MADT limit value of 0.60 shall apply.

5.1.3 Acceptance sampling

5.1.3.1

Use of specifications S-S-01, S-S-03, and S-S-04 is mandatory effective July 1st, 2008.

5.1.3.2

Prior to implementation of acceptance sampling for the aforementioned meters, all of the associated measurement uncertainties (i.e. those associated with the measuring apparatus, proving process, and meter) must first be determined, as per the requirements of S-S-02 and the guidelines in Bulletin S-01. The measurement uncertainty requirements of S-S-02 shall be implemented as prescribed in section 5.1.1.

5.1.4 Compliance sampling

5.1.4.1

As of January 1st, 2011, S-S-06 may be applied for the reverification of diaphragm gas meters by compliance sampling. Alternatively, LMB-EG-04 may continue to be used for the reverification of the aforementioned meters until December 31st, 2013. As of January 1st, 2014, LMB-EG-04 will be rescinded and S-S-06 will be the only specification authorized for use in the inspection of isolated lots of meters in service.

5.1.4.2

A mandatory implementation date for the application of the uncertainty requirements in specification S-S-02 for the reverification of the aforementioned in-service meters by compliance sampling has not been set at this time.

5.1.5 100% Inspection

5.1.5.1

Application of the specifications S-G-02 and S-S-02 for 100% inspection of the meters identified in 5.1 is mandatory effective July 1st, 2008.

5.2 Other gas meters

5.2.1 Measurement uncertainty specifications—S-S-02

5.2.1.1

Prior to the implementation of 100% inspection or acceptance sampling of the meters identified in 5.2, all of the associated measurement uncertainties (i.e. those associated with the measuring apparatus and meter) must first be determined, as per the requirements of S-S-02 and the guidelines in Bulletin S-01.

5.2.1.2

The determination of the measurement uncertainties for the gas measuring apparatus established pursuant to the specifications in S-S-02 required to support the verification or reverification of the aforementioned meters shall be completed and the actual measurement uncertainty values authorized by MC.

5.2.2 Acceptance sampling

Acceptance sampling is not currently authorized for gas meters not identified in section 5.1. Once MC has authorized revised meter specification requirements in S-G-02 to support the use of acceptance sampling under S-S-04, AMVs may then submit a request to MC for expansion of scope of their accreditation program to implement acceptance sampling using the new specifications in S-S-01, S-S-03, and S-S-04.

5.2.3 Compliance sampling

Compliance sampling inspection is not authorized for meter types other than diaphragm meters. Once MC has authorized revised meter specification requirements in S-G-02 to support the use of compliance sampling specifications, AMVs may then submit a request to MC for expansion of scope of their accreditation program to implement compliance sampling for the reverification of these meters.

5.2.4 100% Inspection

5.2.4.1

AMVs may continue to use 100% inspection methods, for which they are accredited, for the purposes of verification or reverification of the aforementioned meters until MC has authorized revised meter specification requirements in S-G-02 (required to support the use of the 100% inspection and/or sampling specifications in S-S-04) for the aforementioned meters.

5.2.4.2

A mandatory implementation date for the application of measurement uncertainty in conformity assessment of the aforementioned meters by 100% inspection has not been set at this time. The applicable implementation date will be established to coincide with the effective date of the revised meter specification requirements in S-G-02 (required to support the use of the 100% inspection and/or sampling specifications in S-S-04) for the aforementioned meters.

6.0 Measurement Canada inspections

6.1 Electricity and gas measurement dispute investigation procedure

6.1.1 Measurement uncertainty specifications—S-S-02

6.1.1.1

A mandatory implementation date for the application of the measurement uncertainty requirements, at the operational location, in specification S-S-02 for the dispute investigation procedure identified in 6.1, has not been set at this time. The applicable implementation date for S-S-02, regarding the operational location, will be established to coincide with the effective date of the revised meter verification specifications in S-E-02 or S-G-02 (required to support the use of sampling and/or 100% inspection) for the aforementioned meters.

6.1.1.2

Prior to the implementation of the dispute investigation procedure, all of the associated system measurement uncertainties (i.e. those associated with the measuring apparatus and an ideal meter) must first be determined, as per the requirements stipulated in sections 4.1.1, 4.2.1, 4.3.1, 5.1.1, and/or 5.2.1.

6.1.1.3

The determination of the measurement uncertainty for each apparatus established pursuant to the specifications in S-S-02 (i.e. those associated with the measuring apparatus and an ideal meter) required to support the dispute investigation of the aforementioned meters, shall be completed and authorized by MC by date stipulated in section 4.1.1, 4.2.1, 4.3.1, 5.1.1, and/or 5.2.1.

6.1.1.4

The method of determination of the combined measurement uncertainty of the meter calibration result established pursuant to the specifications in S-S-02 (i.e. those associated with the measuring apparatus and meter) required to support the dispute investigation of the aforementioned meters shall be completed and authorized by MC by the date stipulated in section 4.1.1, 4.2.1, 4.3.1, 5.1.1, and/or 5.2.1.

6.1.1.5

The scope of application of measurement uncertainty in dispute investigations will only apply to the meter verification compliance assessment portion and not to the dispute specification compliance assessment.

6.1.2 Dispute investigation—electricity

6.1.2.1

Use of S-E-02 (with the exception of Annex A) and P-EG-01 may continue to be used for the dispute investigation procedure until the applicable date stipulated in section 4.1.4, 4.2.4, and/or 4.3.4. Application of the specification S-E-02 (including Annex A) and P-EG-01 for the dispute investigation procedure, is effective July 1st, 2009. The applicable date stipulated in section 4.1.4, 4.2.4, and/or 4.3.4 falling after July 1st, 2009 shall apply.

6.1.2.2

Subject to section 6.1.1.1, application of the uncertainty requirements in specification S-S-02 for the dispute investigation procedure is effective July 1st, 2009. The date stipulated in section 4.1.4, 4.2.4, and/or 4.3.4, falling after July 1st, 2009 shall apply.

6.1.3 Dispute investigation—gas

6.1.3.1

Existing 100% inspection methods and P-EG-01 may continue to be used for the purposes of the dispute investigation procedure until the applicable date stipulated in section 5.1.5 and/or 5.2.4. Application of the specification S-G-02 and P-EG-01 for the dispute investigation procedure, is effective October 1st, 2008. The applicable date stipulated in section 5.1.5 and/or 5.2.4, falling after October 1st, 2008 shall apply.

6.1.3.2

Subject to section 6.1.1.1, application of the uncertainty requirements in specification S-S-02 for the dispute investigation procedure is effective October 1st, 2008. The date stipulated in section 5.1.5 and/or 5.2.4, falling after October 1st, 2008 shall apply.

7.0 Revisions

The purpose of this revision is to:

  • Include the Compliance Sampling Specification S-S-06 for the Inspection of Isolated Lots of Meters in Service.
  • Include the implementation plan for S-S-06 as previously published in an Information Bulletin.
  • Include the application of measurement uncertainty to electromechanical electricity meters.

The following changes were made in revision 3:

  • Title and sections 1.0, 4.0 and 5.0 : amended bulletin title. Added MC web-site to section 1.0. Various format changes and grammatical amendments to sections 4.0 and 5.0.
  • Sections 4.1.1, 4.2.1, 4.3.1, 5.1.1.1 (first paragraph) and 5.2.1: separated the date when the value of uncertainty is to be expressed vs. the application of that value for conformity assessment.
  • Sections 4.1.4, 4.2.4, 4.3.4, 5.1.5 and 5.2.4: added new sections to clarify the verification and reverification of meters by 100% inspection.
  • Sections 4.1.2, 4.1.3 and 4.1.4: for the identified electromechanical electricity meters, clarified the use of existing specifications and the application of measurement uncertainty.
  • Sections 4.2.2, 4.2.3, 4.2.4: for the identified electronic electricity meters, revised the implementation dates to April 1st and July 1st, 2009; and clarified the use of existing specifications and the application of measurement uncertainty.
  • Sections 4.3.2, 4.3.3 and 4.3.4: for the identified electronic electricity meters, clarified the use of existing specifications and the application of measurement uncertainty.
  • Section 5.1.1.2: for gas diaphragm meters, revision to the default end date—may be used until the time when the actual measurement uncertainty values are determined and authorized by MC.
  • Sections 5.1.2, 5.1.3, 5.1.4 and 5.1.5: for the identified gas meters, clarified the use of existing specifications and the application of measurement uncertainty. Section 5.1.3 the January 1, 2007 acceptance sampling implementation date was removed as it has no purpose. Section 5.1.4 compliance sample implementation date removed as the actual date is to be determined.
  • Section 5.2.2, 5.2.3 and 5.2.4: for the identified gas meters, clarified the use of existing specifications and the application of measurement uncertainty.
  • Section 6.0, added new section to address Investigations of Electricity and Gas Measurement Disputes by Inspectors of MC. Section 6.1.1 clarified the application of the uncertainty requirements, at the operational location. Renumbered "Revision" section to 7.0.

8.0 Additional information

For additional information regarding this bulletin, please contact the Senior Program Officer responsible for statistical methods. For more information regarding Measurement Canada and its programs, visit our website located at http://mc.ic.gc.ca.

Gilles P. Vinet
Vice-President
Program Development Directorate

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