Purpose. Fire extinguishing at nuclear power facilities is particularly difficult because of im¬possi¬bility to de-energize equipment responsible for work of the nuclear reactor. During the fire the main fire load is made by the combustible liquids and polymeric materials which are a part of electric equipment, and the main fire extinguishing substance is water but it is not always effective. Today ac¬cording to the statutory enactments the application of all types of foam agents for extinguishment of the fires of energized equipment is forbidden. Technical development of modern extinguishing me¬thods allowed creating technology of compressing air-foam systems (CAFS). This article contains research aimed at detection of the feasibility of modern technologies of extinction energized electrical equipment with CAFS using for the purpose of de-termining the dependent index. Methods. During the research the stand for defining the current leakage on the jet of compressing air-foam was used, which was developed by the specialists from the State Fire Academy of Emercom of Russia. Results. As a consequence of the research safe distance for compressing air-foam was determined. This distance should be abided during the extinguishing of energized electrical equipment. Also the ma¬the-matical analysis is carried out by method of multiple regressions which has allowed de¬termining depen¬dences of current of leak by a stream of fire extinguishing substance from distance to electric equipment, tension on equipment and coefficient of air-and-water mix. Definition “wet” and “dry” compression foam and criterion of its definition at fires extinguishing of the energized equipment with use of CAFS was offered. Research application field. The obtained results give reason to believe that the use of compressing air-foam of extinction energized electrical equipment allow reducing electrical risk of personal. And also to estimate previously possibilities of fire brigades at fires extinguishing at nuclear power fa¬cilities. Conclusion. The research results were drawn up the recommendations of compressing air-foam extinction of energized electrical equipment.