Abstract: In a fluid reservoir tank such as an oil tank, the metal roof floats. The American Petroleum Institute (API) Recommended Practice (RP) number 545 requires a floating roof to tank resistance of less than 30 milli-ohms. The improved cable system uses a preferred aluminum braided cable to provide low resistance combined with resistance to sour fluids. Prior art used copper and tinned copper braided cables. The new reel is factory pre-assembled and tensioned using a new cable guide with a cable stop bar which stops a cable stop attached near the end of the (approximately 80 foot) cable. A new spring assembly increased tension and extends cable life by minimizing slack in the cable.

Abstract: The invention is a MOV based surge arrester that uses MOVs manufactured from a recently patented process. These new technology MOVs are significantly more uniform in their composition, resulting in more uniform performance. The uniform performance characteristics allow MOVs to be utilized parallel more successfully, eliminating many of the previous problems encountered. Instead of attaching wires to each MOV, the MOVs are packaged by placing them between a pair of contact plates, preferably manufactured from aluminum. The pair of plates are connected together and tensioned using non-conductive nuts and bolts. This packaging significantly increases the surface area between the contact plates and the MOVs. Wiring is minimized. Also, the use of the metal plates increases the ability of a surge suppresser to remove the heat generated in severe over-voltage situations. Additional plates can be utilized to increase surge arrestor surge current capability.