Md. Code, Labor and Employment § 6–106

If any part of an individual or object will come within 10 feet of a high voltage line while performing the activity, a person shall comply with § 6-107 of this title before the person may perform, or require or allow an employee to perform, any of the following activities:

(1) moving all or any part of a building or other structure;

(2) trimming a tree or doing any similar activity; or

(3) erecting, operating, storing, transporting, or otherwise handling any object, including:

(i) an antenna;

(ii) an antenna support;

(iii) equipment;

(iv) a flagpole;

(v) machinery;

(vi) material;

(vii) tools; or

(viii) other apparatus.