CIRCUIT THEORY USE AT EXTINCTION PROCESS ANALYSIS OF LIVE ELECTRICAL INSTALLATIONS AT POWER ENGINEERING FACILITIES
PURPOSE. In the article electrical processes occurring in extinguishant streams, pump and hose systems, safety earthing, a fireman's body and electrical equipment during fire extinguishment of live electrical installations at power engineering facilities are considered. 
METHODS. The proposed strategy is based on the circuit theory and theoretical basic electrical engineering. The electric circuit analogy involving complex resistance is proposed for varying voltages and current analysis. Complex resistance analysis is carried out and equivalent circuits with inductive, capacitance and resistive elements are proposed. 
FINDINGS. The article suggests the method of theoretical analysis and description based on Kirchhoff's law of complex voltages and currents in extunguishant streams, pump and hose systems, safety earthing, a fireman's body and electrical equipment during fire extinguishment of live electrical installations at power engineering facilities. The study has proposed the formula for describing complex resistance of extunguishant streams involving temperature-activated water streams. 
RESEARCH APPLICATION FIELD. The described method and obtained theoretical data make it possible: to minimize electric shock risk for firemen, extinguishing live electrical installations; to develop technical facilities, extinguishing agents and ways of their delivery for safe and effective extinguishment of live electrical installations. 
CONCLUSIONS. On the basis of the described method dependence of current flowing through the fireman's body on extunguishant streams current conductivity is proved. On the basis of the received data further study of extunguishant streams current conductivity used for extinguishing live electrical installations is proposed.