Maryland Code, Public Safety § 12-602

(1) public utilities, their affiliated companies, and electrical appliances and devices used in their work;

(2) the inspection or certification of an electrical installation by a unit of a county government that is authorized to conduct electrical inspections; or

(3) an electrical installation of the State or federal government during an emergency if the electrical installation is necessary for the public welfare as a result of the emergency.

(b)(1) This subtitle does not supersede any local law or ordinance of a local jurisdiction that establishes standards or qualifications for electrical inspectors and inspections within that local jurisdiction.

(2) A certified nongovernmental electrical inspector shall obtain county approval or certification as may be required by local law or ordinance.