65 ILCS 5/10-3-4

The provisions of Section 10-3-3 do not apply:

(1) To the person in command of a municipal fire department;

(2) To employees of a fire department who are employed subject to call;

(3) To the members or employees of a fire department, when required to remain on duty by the marshal or chief officer or any of his aids on account of a serious emergency caused by conflagration, riot, or other causes.