4002.1 Unless one or more of the following standards are waived by the EDC, a Small Generator Facility must comply with the following standards, as applicable:

1. (a) Institute of Electrical and Electronics Engineers (“IEEE”) 1547 Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces;
2. (b) IEEE 1547.1 - Standard Conformance Test Procedures for Equipment Interconnecting Distributed Energy Resources with Electric Power Systems and Associated Interfaces;
3. (c) IEEE 1547.2 - Application Guide for IEEE Standard 1547 for Interconnecting Distributed Resources with Electric Power Systems;
4. (d) Underwriters Laboratories (“UL”) 6142 Standard for Small Wind Turbine Systems; and
5. (e) UL 1741 Standard for Inverters, Converters and Controllers for Use in Independent Power Systems. UL 1741 compliance must be recognized or certified by a Nationally Recognized Testing Laboratory as designated by the U.S. Occupational Safety and Health Administration. Certification of a particular model or a specific piece of equipment is sufficient. It is also sufficient for an inverter built into a Generating Facility to be recognized as being UL 1741 compliant by a Nationally Recognized Testing Laboratory.

4002.2-4002.4 [RESERVED]

4002.5 The Interconnection Equipment shall meet the requirements of the most current approved version of each standard listed in Subsection 4002.1, as amended, and supplemented at the time the Interconnection Request is submitted.

4002.6 Nothing herein shall preclude the need for an on-site Witness Test or operational test by the Interconnection Customer.

4002.7 Advanced Inverters

To comply with IEEE 1547-2018:

1. (a) After January 1, 2022 (upon commercial availability), any Small Generator Facility requiring an inverter that submits an interconnection request shall use an Advanced Inverter with either a default or a site-specific EDC required inverter settings profile, as determined by the EDC.

1. (b) Any Small Generator Facility may replace an existing inverter that was purchased prior January 1, 2022, with an inverter of equal or greater capability than the original inverter, for use at the Small Generator Facility.
2. (c) The EDC shall establish default EDC required inverter settings profiles for Advanced Inverters pursuant to Subsection 4002.7 (e), and shall publish the default EDC required inverter settings profile on the EDC's website prior to January 1, 2022.
3. (d) To the extent reasonable, pursuant to any modifications required by Subsection 4002.7 (e), all EDC required inverter settings profiles shall be consistent with applicable Advanced Inverter recommendations from PJM Interconnection, LLC.
4. (e) A default EDC required inverter settings profile shall be established by an EDC to optimize the safe and reliable operation of the Electric Distribution System, and shall serve the following objectives:
5. (1) The primary objective is to incur no involuntary real power inverter curtailments incurred during normal operating conditions and minimal real power curtailments during abnormal operating conditions.
6. (2) The secondary objective is to enhance Electric Distribution System hosting capacity and to optimize the provision of grid support services.
7. (f) A site-specific EDC required inverter settings profile may be established by an EDC as necessary to optimally meet objectives established in Subsection 4002.7 (e).
8. (g) All default EDC required inverter settings profiles will be documented in the interconnection agreements.
9. (h) A list of acceptable Advanced Inverters shall be published on the EDC's website prior to January 1, 2022.

4002.8 Meter Collar Adapters

With respect to meter collar adapters, the following provisions apply:

(a) An EDC shall approve a meter collar adapter model for installation for specific compatible meter configurations and customer applications, Public Utilities and Cable Television

provided that the meter collar adapter model meets the following criteria:

1. (1) The meter collar adapter model is approved or listed by a nationally recognized testing laboratory;

2. (2) The meter collar adapter model is approved for use by an EDC, unless sufficient rationale for disapproval is provided by an EDC in accordance with Section 4002.8(b) of these rules;

3. (3) All meter collar model installations, access, testing, inspections, servicing and removals shall only be performed by a qualified person as agreed between the EDC and the meter collar manufacturer;

4. (4) The meter collar adapter model design does not impede access to the sealed meter socket compartment, or to the meter itself by a qualified person;

5. (5) The meter collar adapter model is compatible with the National Electric Code;

6. (6) The meter collar adapter model is compatible to the specific meter configurations and customer applications to ensure that the meter collar adapter is capable of being safely and reliably inserted into a meter socket to maintain a secure connection with both the meter socket and the utility meter.(b) An EDC shall approve or disapprove a meter collar adapter model for installation in its service area no later than 90 days after a meter collar manufacturer submits a request for approval of the meter collar adapter and an EDC's procedures shall be updated within ninety (90) days of approval.1. (1) A meter collar manufacturer that submits a request to an EDC for approval shall file the request with the Commission in Formal Case No. 1050, and shall be served on the Office of the People's Counsel of the District of Columbia and other parties in accordance with 15 DCMR § 115.2.

2. (2) An EDC shall provide an explanation to the requesting meter collar manufacturer explaining the reasons any meter collar adapter model application was denied. Such explanation shall be filed with the Commission in Formal Case No. 1050, and shall be served on the Office of the People's Counsel of the District of Columbia and other parties in accordance with 15 DCMR § 115.2.

(3) An EDC shall provide public notice of all decisions approving a meter collar adapter model by posting the information on the utility's website and providing an update to the Commission in Formal Case No. 1050, and shall be served on the Office of the People's Counsel of the District of Columbia and other parties in accordance with 15 DCMR § 115.2.

(c) An EDC shall authorize the installation and operation of an EDC-approved meter collar adapter for a customer installation, provided the meter collar adapter meets the following criteria:

(1) The meter collar adapter is qualified to be connected to the supply side of the service disconnect pursuant to the applicable provisions of the National Electric Code;

(2) The meter collar adapter is rated for the meter socket into which it is intended to be installed;

(3) The meter collar adapter does not exceed the weight bearing limits of a meter socket;

(4) Only one meter collar adapter may be installed per meter base.

(5) The meter collar adapter does not disable the excessive heating detection capability of AMI meters.

(d) An EDC shall uninstall an approved meter collar adapter in the aggregate if any deficiencies are found after installation that result in safety or operational concerns, if these concerns cannot be remediated by a customer for a specific installation or by a meter collar adapter manufacturer, in the aggregate. An EDC shall notify the Commission of plans to undertake such an action with an appropriate filing in Formal Case No. 1050, and shall be served on the Office of the People's Counsel of the District of Columbia and other parties in accordance with 15 DCMR § 115.2.

SOURCE: Final Rulemaking published at 56 DCR 1415 (February 13, 2009); as amended by Final Rulemaking published at 66 DCR 01132 (January 25, 2019); as amended by Final Rulemaking published at 68 DCR 8244 (August 20, 2021); as amended by Final Rulemaking published at 72 DCR 012476 (November 7, 2025).