High Voltage Spool Porcelain Insulator 1.Standard:IEC,ANSI,GB,BS,AS,DIN and etc. 2.Certified by ISO9001:2000,14001 ... Insulator1.Standard:IEC,ANSI,GB,BS,AS,DIN and etc.2.Colour: light gray,brown,white,sky blue and ... etc.3.Non-standard products:Designed by TCI or specified by the customers.A spool insulator is an insulator of ... the attachment of a conductor. High Voltage Spool Porcelain Insulator