Miss. Code § 21-25-7
In all municipalities of this state maintaining a paid fire department, the personnel of which department is actively and exclusively engaged in fire duty, no member of such department, exclusive of the chief officer, shall be required to remain on active duty for an entire twenty-four hours. The personnel of such fire department shall be divided into two platoons, or shifts, one to perform duty in the daytime and the other to perform duty in the nighttime, but neither platoon, or shift, shall be required to remain on active duty in any event for more than fourteen hours per day, except in cases of urgent and extreme necessity.
Each municipality coming within the provisions of this section shall immediately submit to the Mississippi state rating bureau the set-up and organization of its fire department which will be necessary in order to comply with the provisions of this section and which can be effected without employing more than one additional fireman. Such municipality shall require of said rating bureau a ruling as to whether or not such a set-up and organization of its fire department would adversely affect the present insurance rating of such municipality; if said rating bureau in answer to such request shall give a written ruling in the affirmative the municipality requesting such ruling shall be exempt from the provisions of this section.
Miss. Code § 21-25-7