Insulation Failure of Class 1E Cable for Nuclear Power Station Under Fire Heat Radiation

In order to discover the regularity of insulation failure of typical cable for nuclear power plant in fire, the experimental research method was used to study the insulation failure of Class 1E cable for nuclear power plant under different simulated fire conditions by using cable thermal radiation test furnace in this paper. The results show that the insulation failure time and the breakdown time of the cable decrease exponentially with the increase of the ambient heat radiation flux, and the insulation failure temperature and the insulation breakdown temperature of the cable are basically the same.