The classified service shall include:
a. Members, including officers, of the Police and Fire Divisions, other than the Chiefs thereof.
b. Employees of any utility operated by the municipality requiring an operator's license, except a chauffeur's license, in the performance of their duties.
c. Inspectors, such as plumbing, heating, electrical, health, sanitary, sewer, or other inspectors required in municipal operations.
d. Skilled labor.
e. Office help, mechanics and all positions not specifically included by this Charter in the unclassified service.