Insulation cover of electric wire

PURPOSE: A wire insulation cover is provided to uniformly form an electric field by forming both edges of an air insulation hole into a round shape. CONSTITUTION: An insulation cover for a wire comprises a main body(200) and a combining unit(300). The main body has a hollow cylindrical shape. An opening and closing part is formed along the longitudinal direction of the main body. A plurality of air insulation holes(230) are formed between the outer insulating surface and inner insulating surface of the main body. A plurality of vent grooves(400) are formed in the inner insulating surface of the main body. The combining unit comprises a first protrusion and a second protrusion. A combining protrusion is formed in the first protrusion. A first and a second insertion hole are formed in both sides of the combining protrusion.