Abstract: An apparatus for limiting an interphase current and a leakage current of flooded electrical installations. More specifically, provided is the apparatus, when electrical installations are flooded in water, vapor, and other liquids which have high electrical conductivity, for preventing the electrical installations from being damaged after an interphase current, between both power lines in the electrical installations, rapidly increases through the liquids with high electrical conductivity, or preventing an electric shock accident by limiting a leakage current flowing into the earth through the liquid on both power lines. To this end, the apparatus provides a phase wire portion, an insulation barrel, a barrel-shaped wire, and a housing ground.