NGrid Witness Test Procedure Template - REV3.1 - 04-20-22

Aug 31, 2026

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Template for customers seeking to interconnect a distributed generation (DG) facility with National Grid’s electric power system (EPS). It standardizes documented witness testing procedures to demonstrate compliance with protective relaying and automated control connection requirements. The document defines the required procedure structure, responsibilities for test planning and sequencing, approval prerequisites, and obligations to verify applicable codes, laws, and post-test restoration. It includes sections for project information, contacts, system description, referenced drawings, safety briefing, and minimum testing requirements aligned to referenced standards.

LanguageEnglish

CategoryForms

FormatDOCX

Pages26

Reading Time9 min

AccessFree to download

Project Information

Customer Lead Contact

Testing Agent Lead Contact

System Description

Project Drawings Referenced

Test Procedures

Safety Brief

Minimum Requirements

Informative (*Customer to review then remove this page from submitted witness test procedure) Customers seeking to interconnect a distributed generation (“DG”) facility to National Grid’s electric power system (“EPS”) must demonstrate that such facility has met all protective relaying and automated control requirements necessary to safely and reliably interconnect to the EPS (“Connection Requirements”). The Company has developed this template solely for the purpose of providing a more standardized format for customer documented witness testing procedures (“Procedures”) to assist the Company’s review of such Procedures and the testing of the DG facility in accordance therewith. This template contains only a sample of the minimum Connection Requirements for most DG facilities. There may be additional or fewer requirements applicable to any specific facility. It is the customer’s sole obligation to determine the Connection Requirements applicable to the facility and to update this witness testing procedure template as necessary (including, without limitation, to the extent any Connection Requirement contained herein is incomplete, inaccurate, or subsequently amended). In general, the customer shall write the witness test procedure for each Connection Requirement using the following format: Descriptive Test Title It is the customer’s responsibility to arrange the tests in this template in an order that is appropriate for the facility being tested. The customer shall identify the devices to be operated for each test and any steps required to move from one test condition to another. If the customer’s witness testing will take place over two or more days, the customer shall indicate in its Procedures the number of days of testing expected, and the tests expected to occur on each day. To the extent the customer includes Procedures for the testing of functions that are not required to be witnessed by the Company, the Company, in its discretion, may request that such functions be removed from the testing Procedures, or may refrain from witnessing that portion of the Procedure. This shall not be construed to mean that the testing of such functions is not required for the operation of the facility, and it shall be the customer’s obligation to perform the testing of such functions separate from the Company’s witness testing if necessary. The customer must complete this document in sufficient detail, and provide applicable supporting documentation such as project drawings, to identify the scope of work for each individual test necessary to demonstrate that the Connection Requirements have been met, including without limitation, the Company’s Electric Service Bulletin (ESB) 756 and Institute of Electrical and Electronics Engineers (IEEE) 1547, as the same may be amended from time to time. The Company is relying upon the information provided by the customer herein, and the customer shall ensure that all information provided is true, complete and accurate. Procedures must be approved by the Company in writing before the customer performs the witness testing for the facility. The Company’s approval of the customer’s Procedures does not mean that the customer is authorized to interconnect to the Company’s EPS. It is the customer’s sole obligation to ensure that the facility meets all applicable federal, state, and local, codes, rules, regulations, and laws (collectively “Applicable Laws”). The Company’s approval of the Procedures does not mean, by implication or otherwise, that the customer’s facility complies with the Connection Requirements or Applicable Laws. Once the witness test is completed, it is the customer’s sole obligation to ensure that the facility, including all devices and equipment, is returned to its normal operating state and is secured. By using this template (in whole or part) the customer acknowledges that

FAQs

What is the purpose of this witness test procedure template?

It provides a standardized format for documenting customer witness testing procedures so National Grid can review them and the DG facility can be tested in accordance with the connection requirements.

What responsibilities does the customer have before witness testing starts?

The customer must complete the document with sufficient detail and supporting documentation, arrange and sequence tests, identify devices and day-by-day expectations if needed, and ensure the procedures are approved in writing by the company before testing.

What must be addressed after the witness test is completed?

The customer must ensure the facility, including all devices and equipment, is returned to its normal operating state and secured.

Aug 31, 2026

Upload by Mali