Said commissioners shall classify all the offices and places of employment in said county with reference to the examination hereinafter provided for, except those offices and places mentioned in Section 3-14022. The offices and places so classified by the commission shall constitute the classified civil service of said county, and no appointments to any of such offices or places or removals therefrom shall be made except under and according to the rules hereinafter mentioned.
55 ILCS 5/3-14013