Ethylene vinyl acetate (EVA) is an essential polymer in halogen-free flame retardant (HFFR) cable materials because they exhibit enhanced filler loading and appropriate mechanical properties such as flexibility. Usual flame retardants include aluminum trihydroxide (ATH) and magnesium dihydroxide (MDH). The purpose of this work is to create numerical models describing the fire behavior of such materials (i.e. cable sheathing made in EVA/ATH). Pyrolysis modeling of materials involve the resolution of mass and energy conservation equations. The energy conservation equation was solved taking into account conduction, heat generation from reactions, and convection from adjacent elements. The mass conservation equation was solved accounting for the production of components due to reactions, advection of gaseous components. The measurement of input data is essential to get both accurate and comprehensive model. Novel experimental protocols were developed to determine the thermophysical parameters as a function of temperature and of decomposition state (e.g. heat capacity, heat conductivity). The model also includes kinetic aspect and the formation of the different species according to the decomposition state of the material. The resolution of the equations permits to completely describe the fire behavior of the material with a reasonable accuracy capturing the physics of the phenomena. Cables have been included in the EN 13501-6 classification standard within the Construction Products Regulation (CPR) and it is required to test them according to the EN50399 standard: a large scale test for classification of vertically mounted cables. Based on the simulation of the fire behavior of cable sheathing and on dimensional analysis, bench scale test was developed and correlations were found between the large scale and reduced scale tests.