The Fire Marshal shall perform those duties of the Chief, pertaining to investigation and the like of fires, as are referred to in §
29-7C, as the Chief may delegate to the Fire Marshal, in whole or in part, and under the Chief's supervision. In the absence of the Fire Marshal or in the event of his/her incapacity or refusal to act or as assistant to the Fire Marshal, the Assistant Fire Marshal shall perform those duties or such duties pertaining thereto as the Chief may direct.