In article results of experimental researches of optical cable behavior in microducts at water freezing are presented. Researches were carried out with the polymeric and steel microducts. Researches have shown that loadings which influence on a cable at water freezing in the steel microduct is higher than in polymeric and can lead to attenuation increase in the optical fiber. In the polymeric duct loadings more low, than in the steel. However if a polymeric microduct freeze in ice, pressure upon a cable as can cause an incrementation of attenuation.© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.