Porcelain electrical insulator resistant to destruction by projectiles

摘要

A porcelain electrical insulator resistant to destruction by projectiles comprises a shed and a head portion protrusively and integrally formed with the shed. The thinnest part of the shed is not less than 5 mm, and the thickness of the head portion which is to be covered with a cap or the thickness of the insulator in the vicinity of the junction portion between the head portion and the shed is not less than 2 times the minimum thickness of the shed.