Unless otherwise specified by the Commission, the utility shall use the applicable provisions in the latest revised version of the incorporated by reference publications listed below as standards of accepted good engineering practice in this subtitle:

1. A. National Electrical Safety Code, ANSI C2 — 2017;
2. B. National Electrical Code, ANSI/NFPA 70 — 2020;
3. C. American National Standard for Electric Meters — Code for Electricity Metering, ANSI C12.1 — 2014;
4. D. American Standard Requirements, Terminology and Test Code for Instrument Transformers, ANSI/IEEE C57.13 — 2016;
5. E. Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces, IEEE 1547-2018;
6. F. Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces, IEEE 1547-2018 Amendment 1 (IEEE Std. 1547a-2020);
7. G. Errata to Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces, IEEE 1547-2018;
8. H. IEEE 1547.1-2020, Standard Conformance Test Procedures for Equipment Interconnecting Distributed Energy Resources with Electric Power Systems and Associated Interfaces;
9. I. UL Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources, UL Standard 1741, Edition 3, Edition Date: September 28, 2021;
10. J. NEMA Standards Publication TP 1 — 2002;
11. K. Guide for Electric Power Distribution Reliability Indices, IEEE Standard 1366 — 2003, 4.5 Major event day classifications;
12. L. Institute of Electrical and Electronic Engineers Standard 1695 — 2016 — IEEE Guide to Understanding, Diagnosing, and Mitigating Stray and Contact Voltage;
13. M. Interconnection Requirements for Onboard, Grid Support Inverter Systems, SAE J3072, Revision 3, June 10, 2024;
14. N. Electric Vehicle Supply Equipment, UL 2594, Edition 3, December 15, 2022; and
15. O. Electric Vehicle Power Export Equipment (EVPE), UL 9741, September 29, 2023.

Authority: Public Utilities Article, §§2-113, 2-121, 5-101, 5-303, and 7-213, Annotated Code of Maryland

Effective date: May 22, 1942 (Order No. 38330)

Chapter revised effective May 18, 1960 (Order No. 54348)

Chapter revised effective June 1, 1965 (Order No. 55819)

Regulation .02 amended effective January 23, 1981 (8:2 Md. R. 117); March 27, 2006 (33:6 Md. R. 580); June 9, 2008 (35:8 Md. R. 808); September 21, 2009 (36:19 Md. R. 1438); May 28, 2012 (39:10 Md. R. 661); October 8, 2018 (45:20 Md. R. 920); March 20, 2023 (50:5 Md. R. 183); August 21, 2023 (50:16 Md. R. 728)

Regulation .02K, L amended effective July 7, 2025 (52:13 Md. R. 657)

Regulation .02M—O adopted effective July 7, 2025 (52:13 Md. R. 657)

Regulation .04 amended effective April 15, 2002 (29:7 Md. R. 622); May 28, 2012 (39:10 Md. R. 661)

Regulation .05 adopted effective March 27, 2006 (33:6 Md. R. 580)

Regulation .05 amended effective June 9, 2008 (35:8 Md. R. 808)

Regulation .06 adopted effective September 21, 2009 (36:19 Md. R. 1438)

Regulation .06D adopted effective December 2, 2019 (46:24 Md. R. 1104)