Exception to 101.2 Detached one- and two-family dwellings and multiple single family dwellings (townhouses) not more than three (3) stories above grade plane, for maximum of three (3) levels including lofts, a habitable story and attics with storage, in height with a separate means of egress, and their accessory structures not more than one-story above grade plane in height and less than three thousand (3,000) square feet in area, shall comply with the International Residential Code (IRC). Subsection 101.4.8, Electrical. The provisions of Subtitle 9 of this Code and the National Electrical Code shall apply to the installation of electrical systems, including alterations, repairs, replacements, equipment, appliances, fixtures, fittings and appurtenances thereto. Subsection 101.4.1, Gas. The provisions of the Washington Suburban Sanitary Commission ("WSSC") known as the WSSC Plumbing and Fuel Gas Code; the International Plumbing ("IPC"); and the International Fuel Gas Code ("IFGC") shall apply to the installation of gas piping from point of delivery, gas appliances, and related accessories as covered in the Code. Subsection 101.4.3, Plumbing. The provisions of the Washington Suburban Sanitary Commission ("WSSC") known as the WSSC Plumbing and Fuel Gas Code shall apply to the installation, alterations, repair or replacement of plumbing systems including alterations, repairs, replacement, equipment, appliances, fixtures, fittings and appurtenances thereto. Subsection 101.4.5, Applicability. Whenever this Code makes reference to the International Fire Code, the requirements of the National Fire Protection Association (NFPA) 1 and Subtitle 11 of the Prince George's County Code shall apply except where referenced in 2021 IBC: Section 2702 Emergency and Standby Power Systems, Section 3111 Solar Energy Systems, Section 413 Combustible Storage, Section 426, Combustible Dusts, Grain Processing and Storage, Section 427 Medical Gas Systems, Section 428 Higher Education Laboratories, and any Energy Storage Systems, Stationary Fuel Cell Power Systems, Electrical Energy Storage Systems (ESS) shall comply with the most stringent of NFPA 1 and 2021 International Fire Code.