Except as otherwise provided in this title, to qualify for licensure as a stationary engineer, an applicant shall meet the requirements of this section and pass an examination administered by the Board. In addition to the other qualifications for a license set forth in this subtitle, an applicant shall qualify under this section by meeting the educational and experience requirements set forth in subsection (c) of this section. An applicant for the Grade 1 stationary engineer’s examination qualifies under this section if the applicant possesses at least one of the following qualifications: 5 years of documented experience as an active Grade 2 stationary engineer under the direction and control of a Grade 1 stationary engineer, toward which an applicant may receive: 1 year of credit for 6 credit hours of classes or continuing education units in boiler safety or operations; and 1 year of credit for holding a current active license as a: master plumber; master heating, ventilation, air–conditioning, and refrigeration contractor; or master restricted heating, ventilation, air–conditioning, or refrigeration contractor; a 4–year degree in mechanical engineering from an accredited university or college; licensure as a professional engineer including: 1 year of documented experience as a professional engineer; and 1 year of documented experience as a Grade 2 stationary engineer under the direction and control of a Grade 1 stationary engineer; or a valid marine engineer’s certificate or a chief petty officer’s certificate from the United States Navy with documentation of steam boiler engineer training. An applicant for a Grade 2 stationary engineer’s examination qualifies under this section if the applicant possesses at least one of the following qualifications: 36 months of documented experience as an active Grade 3 engineer under the direction and control of a licensed Grade 2 or Grade 1 stationary engineer, that may include: 1 year of credit for 6 credit hours of classes or continuing education units in boiler safety or operations; and 1 year of credit for holding a current active license as a: master plumber; master heating, ventilation, air–conditioning, and refrigeration contractor; or master restricted heating, ventilation, air–conditioning, or refrigeration contractor; a 4–year degree in mechanical engineering from an accredited university or college; licensure as a professional engineer and 6 months of documented experience as a Grade 3, Grade 4, or Grade 5 stationary engineer; or a valid marine engineer’s certificate or chief petty officer’s certificate from the United States Navy. An applicant for a Grade 3 stationary engineer’s examination qualifies under this section if the applicant possesses at least one of the following qualifications: 2 years of documented experience as an active Grade 4 or Grade 5 stationary engineer; 1 year of documented experience as an active Grade 4 or Grade 5 engineer and 6 credit hours or continuing education units of classes in boiler operations or safety; or a valid marine engineer’s certificate or chief petty officer’s certificate from the United States Navy. An applicant for a Grade 4 stationary engineer’s examination qualifies under this section if the applicant possesses at least one of the following qualifications: 6 months of documented experience as an active Grade 5 stationary engineer; or 3 credit hours or continuing education units of classes in boiler operations or safety. An applicant for a Grade 5 stationary engineer’s examination qualifies under this section if the applicant possesses a high school diploma or graduate equivalence diploma.