Patent Number: 041683943
Section: claims

1. In combination: a concrete wall capable of shielding radiation;  a penetration nozzle piercing said wall from side to side;  an annular flange fixed on one end of said nozzle;  a header plate removably mounted to said flange;  an annular gasket disposed between said flange and said plate;  said gasket having a pair of opposing surfaces and each surface having an annular groove formed therein;  said gasket having at least one aperture communicating with both of said grooves;  said header plate having at least one transverse bore wherein said bore has two cylindrical bore sections of different diameters connected by a tapered bore section with the larger of the cylindrical bore sections disposed removed from said nozzle;  said header plate having a first passageway communicating with said tapered section and having one end extending to an exterior surface of said plate, and said plate having a second passageway communicating with said first passageway and having one end extending to the surface of said plate adjacent to said flange and communicating with said grooves;  an electric penetration assembly disposed within said transverse bore of said plate;  sealing means disposed between said plate and said assembly and within said tapered section;  a retaining ring removably clamped to said plate and securing said assembly to said plate.  an electrical conductor;  an insulator disposed around said conductor with both ends of said conductor exposed;  said insulator having two cylindrical surfaces disposed on each side of a conical surface and said conical surface being disposed substantially at the middle thereof;  a gas permeable pervious means disposed in said insulator and between the ends thereof;  an annular flexible end cap permanently bonded to each end of said insulator and to said conductor.  an annular disc made of a porous ceramic; and  said disc is disposed within said conical section.  an annular thin metal member and shaped so that the outer periphery is bonded to said insulator and the inner periphery is bonded to said conductor.  said insulator having a T-shaped duct formed therein and having one duct disposed parallel to said conductor and having the other duct communicating with said first duct and opening at the exterior surface of said tapered section.  an annular thin metal member and shaped so that the outer periphery is bonded to said insulator and the inner periphery is bonded to said conductor.  said insulator having a zigzag duct terminating against said conductor and opening at the exterior surface of said tapered section.  an annular thin metal member and shaped so that the outer periphery is bonded to said insulator and the inner periphery is bonded to said conductor.  a plurality of parallelly spaced conductors;  an insulator disposed around said conductors with both ends of said conductors exposed;  said insulator having a conical surface and two cylindrical surfaces disposed on each side of said conical surface;  said insulator comprised of a solventless silicone resin with a filler material of between 60 to 75 percent by weight of said resin;  said filler material selected from the group consisting of alumina, barium titanate, silica and magnesia, all in a powdered form;  said insulator also comprised of a porous ceramic disc disposed between said silicone resin and within said conical surface. 2. An electrical penetration assembly comprising: 3. The assembly of claim 2 wherein said gas permeable means comprises: 4. The assembly of claim 3 wherein each of said end caps comprises: 5. The assembly of claim 2 wherein said gas permeable means comprises: 6. The assembly of claim 5 wherein each of said end caps comprises: 7. The assembly of claim 2 wherein said gas permeable means comprises: 8. The assembly of claim 7 wherein each of said end caps comprises: 9. An electrical penetration assembly comprising: