Abstract:  Determine the content of benzene in the combustion smoke of WDZ-YJ and RVVB cable, and evaluate the risk of chronic toxicity of benzene using a dose?response model. The combustion test of WDZ-YJ and RVVB cable was carried out with a cone calorimeter, and the flue gas was collected with an activated carbon sampling tube; Use Agilent 7890A gas chromatograph to quantitatively detect the concentration of benzene in the collected gas samples. According to the quantitative detection results of benzene concentration, the dose?response model was used to evaluate the chronic toxicity risk of benzene. Shows that no matter whether the combustion state is flame combustion or flameless combustion, when the heat radiation flux increases from 20 kW/m2 to 35 kW/m2, the chronic toxicity risk of benzene in the flue gas of WDZ-YJ and RVVB cable is higher than the minimum acceptable risk of 10-6. According to the risk characteristics of chronic toxicity of benzene in the smoke of typical electric wires and cables, fire fighters should wear personal protective equipment such as air respirators and do a good job of personal protection during the handling of related fire accidents. During the investigation of related fire accidents, fire supervisors and fire dispatchers should also reduce the exposure of mouth, nose and skin , minimize the exposure time, and do a good job of personal protection against chronic occupational diseases.

Key words: wire and cable, combustion flue gas, benzene, pathogenic risk