Insulating bushing

An insulating bushing adapted to protect a busbar and having improved insulating properties and waterproof performance, the insulating bushing comprising:

• a first bushing provided with a first bushing passage through which the busbar passes;
• a second bushing provided with a first bushing-receiving portion receiving an upper portion of the first bushing inserted through a lower portion of the first bushing-receiving portion and a second bushing passage through which the busbar passes;
• and
• a cover coupled to an outer surface of the second bushing and provided with a cover passage through which the busbar passes,
• wherein the second bushing comprises:
• a second bushing body;
• and a second bushing flange protruding from a lower portion of the second bushing body in a lateral direction thereof to surround the lower portion of the second bushing body and formed with a plurality of second bushing bolt-holes,
• the second bushing flange being composed of second bushing flange long-sides and second bushing flange short-sides with reference to a shape of the second bushing passage,
• the second bushing flange long-sides having an M shape with peaks and a valley,
• wherein the cover comprises:
• a cover body;
• a lower cover flange protruding from a lower portion of the cover body in the lateral direction to surround the lower portion of the cover body and formed with a plurality of cover bolt-holes;
• and
• an upper cover flange protruding from an upper portion of the cover body in the lateral direction to surround the upper portion of the cover body,
• wherein the lower cover flange is composed of lower cover flange long-sides and lower cover flange short-sides with reference to a shape of the cover passage,
• the lower cover flange long-sides having an M shape including lower cover flange peaks convexly bent in a direction away from a center of the cover and a lower cover flange valley concavely bent in a direction approaching the center of the cover.