Abstract: A ceramic fiber block includes a welding stud disposed between two ceramic fiber layers centrally positioned in the ceramic fiber block. The welding stud includes a base stud which at its one end to be welded to a furnace wall and having a ceramic ferrule and at the other end formed with screw threads, an electrode rod having screw threads at its one end in the ceramic fiber block, and first and second nuts connecting the screw threaded ends of the base stud and electrode rod.

Abstract: Disclosed herein is a support for a heating element in an electric furnace. The support comprises a cylindrical holder made of heat resisting metal and fixed to the wall surface of the electric furnace, a pair of separated insulators secured within the cylindrical holder, a stud bolt made of heat resisting metal and a hook insulator mounted to the stud bolt for hanging the heating element. The insulators have central holes respectively, and one end of the stud bolt is detachably engaged with a member provided within one of the insulators through the central holes, and heat insulating layers are laminated on the wall surface of the electric furnace over the other end of the stud bolt.