ERC Resolution No. 08, Series of 2026 – Consolidated Rules on Meter and Instrument Transformer Testing
ERC issued consolidated and updated rules on the testing, maintenance, and accreditation of electric meters and instrument transformers, streamlining standards and compliance requirements for distribution utilities and microgrid system providers to enhance metering accuracy and consumer protection.
4/1/20263 min read
SUMMARY
WHAT IT IS
This Resolution consolidates, amends, and updates all ERC rules on the testing, maintenance, sealing, and accuracy of electric meters and instrument transformers, and sets requirements for meter shops, in-service testing, and customer-requested meter tests for Distribution Utilities (DUs), Microgrid System Providers (MGSPs), and Third-Party Meter Shops (TPMS).
Distribution Utilities
Microgrid System Providers
Third-Party Meter Shops
WHO IS AFFECTED
KEY DEADLINES
Meter Shop CA/renewal applications: strict group-based schedules; late filings subject to penalties.
In-service sampling plans: Group A (April 2026), B (June), C (August), D (October); every two years thereafter.
Existing Meter Shops have one year from effectivity to comply with new equipment/facility requirements.
Type test report compliance for instrument transformers: within one year from effectivity.
TAKEAWAY
DUs, MGSPs, and TPMS must review and align their meter shop operations, equipment, and reporting to the new rules, and ensure timely submission of required applications and sampling/testing plans.
Immediate compliance is required for new installations and ongoing in-service testing, with significant penalties for non-compliance.
KEY POINTS
Scope: Applies to Distribution Utilities (DUs), Microgrid System Providers (MGSPs), and Third-Party Meter Shops (TPMS) regarding testing, maintenance, sealing, and accuracy of electric meters and instrument transformers.
Meter Testing Requirements: All new and in-service meters and instrument transformers must be tested and sealed by the ERC before installation; in-service meters must be tested at least once every two (2) years under an ERC-approved statistical sampling program.
Meter Shop Requirements: DUs and MGSPs must maintain their own Meter Shops (unless exempted), obtain a Certificate of Authority (CA) valid for four (4) years, and comply with equipment and personnel standards based on shop category.
Exemption from Meter Shop: DUs/MGSPs may apply for exemption within six (6) months from effectivity, subject to proof of feasibility and engagement with a Category-A Meter Shop; exemption valid for four (4) years.
Meter Shop Accreditation: All Meter Shops and Satellite Laboratories must be accredited by the ERC, with specific equipment, personnel, and facility requirements per category; annual and renewal application timelines and documentation are prescribed.
Testing Standards and Accuracy Limits: Reference watt-hour meter standards must have an accuracy class of 0.05% or better; working standards ±0.2% (within 3 years), then ±0.1%; induction-type standards prohibited after one (1) year from effectivity.
Meter Acceptance and In-Service Testing: ERC conducts sample acceptance testing using ANSI/ASQ Z1.4-2003 standards; Acceptable Quality Limit (AQL) of 1% for acceptance, 2.5% for in-service testing; detailed sampling, switching, and reporting procedures are mandated.
Instrument Transformer Requirements: All instrument transformers must be tested and certified by the ERC prior to installation; accuracy class of 0.2 (IEC) or 0.3 (ANSI) or better; type test report from an ILAC-accredited lab required within one (1) year from effectivity.
Deadlines and Compliance: Various deadlines for applications, renewals, exemptions, equipment procurement, and reporting are specified (e.g., six months for exemption, one year for equipment compliance, quarterly reporting).
Compliance Obligations: DUs, MGSPs, and Meter Shops must submit periodic reports, retain test records for at least five (5) years, and comply with ERC inspections; violations may result in fines, suspension, or revocation of CA/CASL.
Mechanisms Amended/Introduced: Consolidates and supersedes previous ERC rules on meter testing and maintenance; introduces harmonized standards, stricter equipment and personnel requirements, new sampling and inspection protocols, and updated fee schedules.
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ERC Resolution No. 08, Series of 2026
Detailed policy analysis
Operational and compliance implications
Stakeholder impact assessment
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Tags: Meter Testing, Meter Shop Accreditation, In-Service Sampling, Instrument Transformer Certification, Distribution Utilities, Microgrid System Providers