This Guidance Note describes the checks the Technical Assurance Agent (TAA) caries out on a Metering System as part of a Inspection Visit

<div data-id="what-this-document-covers" style="text-align:left">What this document covers</div>

<div data-id="what-this-document-does-not-cover" style="text-align:left">What this document does not cover</div>

<div data-id="who-should-use-this-guidance-note" style="text-align:left">Who should use this Guidance Note?</div>

<html><head></head><body><div data-id="market-wide-half-hourly-settlement-mhhs" style="text-align:left">Market Wide Half Hourly <u class="defined-term">Settlement</u> (MHHS)</div></body></html>

<div data-id="what-is-a-taa-inspection-visit" style="text-align:left">What is a TAA Inspection Visit?</div>

<div data-id="securing-site-access-for-a-taa-inspection-visit" style="text-align:left">Securing site access for a TAA Inspection Visit</div>

<div data-id="can-the-appointed-moa-work-on-the-metering-system-before-the-inspection-visit-takes-place" style="text-align:left">Can the Appointed MOA work on the metering system before the Inspection Visit takes Place?</div>

<html><head></head><body><div data-id="supplier-or-registrant-confirmation-of-a-taa-inspection-visit" style="text-align:left"><u class="defined-term">Supplier</u> or <u class="defined-term">Registrant</u> Confirmation of a TAA Inspection Visit</div></body></html>

<div data-id="information-required-from-audit-participants-before-a-taa-inspection-visit" style="text-align:left">Information required from audit participants before a TAA Inspection Visit</div>

<div data-id="moa-ldso-or-netso-attendance-at-a-taa-inspection-visit" style="text-align:left">MOA, <u class='defined-term'>LDSO</u> or <u class='defined-term'>NETSO</u> attendance at a TAA Inspection Visit</div>

<div data-id="taa-working-instructions" style="text-align:left">TAA Working Instructions</div>

<div data-id="information-required-from-the-dc-or-cdca-following-a-taa-inspection-visit" style="text-align:left">Information required from the DC or <u class='defined-term'>CDCA</u> following a TAA Inspection Visit</div>

<div data-id="completing-a-taa-inspection-visit" style="text-align:left">Completing a TAA Inspection Visit</div>

<div data-id="what-must-i-do-once-the-taa-have-completed-an-inspection-visit" style="text-align:left">What must I do once the TAA have completed an Inspection Visit?</div>

<div data-id="do-you-need-more-information" style="text-align:left">Do you need more information?</div>

<div data-id="appendix-1" style="text-align:left">Appendix 1: Category 1 non-Compliances</div>

<div data-id="appendix-2" style="text-align:left">Appendix 2: Category 2 non-Compliances</div>

<html><head></head><body><div data-id="appendix-3" style="text-align:left">Appendix 3: Pro Forma <u class="defined-term">Supplier</u> Letter Requesting Site Access for a TAA Inspection Visit</div></body></html>

<div data-id="appendix-4" style="text-align:left">Appendix 4: Using the National Measurement Transformer Error Statement (NMTES)</div>

<div data-id="reference-001--cop-determination" style="text-align:left">Reference 001 – CoP Determination</div>

<div data-id="reference-002--approved-protocols" style="text-align:left">Reference 002 – Approved Protocols</div>

<div data-id="reference-003--current-transformers-and-open-bars-appropriate-seals" style="text-align:left">Reference 003 – Current Transformers and Open Bars (Appropriate Seals)</div>

<html><head></head><body><div data-id="reference-004--metering-dispensations" style="text-align:left">Reference 004 – <u class="defined-term"><u class="defined-term">Meter</u>ing Dispensation</u>s</div></body></html>

<div data-id="reference-005--complex-and-non-complex-sites" style="text-align:left">Reference 005 – Complex and Non-Complex Sites</div>

<div data-id="reference-006--measurement-uncertainty" style="text-align:left">Reference 006 – Measurement Uncertainty</div>

<div data-id="reference-007--onshore-and-offshore-cva-inspectionsaudits-including-aggregation-rules" style="text-align:left">Reference 007 – Onshore and <u class='defined-term'>Offshore</u> CVA Inspections/Audits (including <u class='defined-term'>Aggregation Rules</u>)</div>

<html><head></head><body><div data-id="reference-008--no-access-supplier-moa-and-ldso" style="text-align:left">Reference 008 – No Access, <u class="defined-term"><u class="defined-term">Supplier</u></u>, MOA and <u class="defined-term">LDSO</u></div></body></html>

<div data-id="reference-009--passwords" style="text-align:left">Reference 009 – Passwords</div>

<div data-id="reference-010--phase-rotation" style="text-align:left">Reference 010 – Phase <span lang="en-GB"><b>Rotation</b></span></div>

<html><head></head><body><div data-id="reference-011--resolution-of-metering" style="text-align:left">Reference 011 – Resolution of <u class="defined-term">Meter</u>ing</div></body></html>

<div data-id="reference-012--sealing" style="text-align:left">Reference 012 – Sealing</div>

<div data-id="reference-013--prevailing-load-test" style="text-align:left">Reference 013 – Prevailing Load Test</div>

<html><head></head><body><div data-id="reference-014--commissioning-for-metering-equipment-installed-before-6th-november-2018-or-where-the-metering-equipment-is-owned-by-the-customer" style="text-align:left">Reference 014 – Commissioning for <u class="defined-term"><u class="defined-term">Meter</u>ing Equipment</u> installed before 6th November 2018 or where the <u class="defined-term"><u class="defined-term">Meter</u>ing Equipment</u> is owned by the <u class="defined-term">Customer</u></div></body></html>

<html><head></head><body><div data-id="reference-014a--commissioning-for-metering-equipment-installed-on-or-after-6th-november-2018-where-the-metering-equipment-is-owned-by-the-licenced-distribution-system-operator-ldso-or-transmission-company" style="text-align:left">Reference 014(A) – Commissioning for <u class="defined-term"><u class="defined-term">Meter</u>ing Equipment</u> installed on or after 6<sup>th</sup> November 2018 where the <u class="defined-term"><u class="defined-term">Meter</u>ing Equipment</u> is owned by the <u class="defined-term">Licence</u>d <u class="defined-term">Distribution <u class="defined-term">System</u> Operator</u> (<u class="defined-term">LDSO</u>) or <u class="defined-term">Transmission Company</u></div></body></html>

<div data-id="reference-014b--pre-june-1993-commissioning" style="text-align:left">Reference 014(B) – Pre-June 1993 Commissioning</div>

<div data-id="reference-015--cop4-records" style="text-align:left">Reference 015 – CoP4 Records</div>

<div data-id="reference-016--measurement-transformer-certificates" style="text-align:left">Reference 016 – Measurement Transformer Certificates</div>

<div data-id="reference-017--fusing-and-links" style="text-align:left">Reference 017 – Fusing and Links</div>

<div data-id="reference-018--outstation-time-keeping" style="text-align:left">Reference 018 – <u class='defined-term'>Outstation</u> Time Keeping</div>

<div data-id="reference-019--overall-accuracy" style="text-align:left">Reference 019 – Overall Accuracy</div>

<html><head></head><body><div data-id="reference-020--meter-compensation" style="text-align:left">Reference 020 – <u class="defined-term">Meter</u> Compensation</div></body></html>

<div data-id="reference-021--duty-of-care" style="text-align:left">Reference 021 – Duty of Care</div>

<html><head></head><body><div data-id="reference-022--checking-that-main-and-check-meters-are-correctly-identified" style="text-align:left">Reference 022 – Checking that Main and Check <u class="defined-term">Meter</u>s are correctly identified</div></body></html>

<html><head></head><body><div data-id="reference-023-defined-metering-point" style="text-align:left">Reference 023– Defined <u class="defined-term"><u class="defined-term">Meter</u>ing Point</u></div></body></html>

<div data-id="appendix-5" style="text-align:left">Appendix 5: TAA Working Instructions</div>

CONTENTS

Performance Assurance: TAA Inspection Visit Local Working Instruction V8.0

Defined Terms

Cross-references