An assembly for a line conduit is configured to be molded into a construction part, such as a concrete casting. The assembly includes positioning module configured for fastening the assembly to a structure, such as a wall or casting. The assembly also includes a casting sheath and a fire protection module, which includes an intumescent fire protection element. The positioning module, the fire protection module and the casting sheath cooperate to form a line passage. The fire protection module includes accepts for a reversible fastening of the casting sheath and/or the positioning module.