Abstract: An electrical assembly includes an electrical component contained within a housing and surrounded by a dielectric electrical insulating material. The dielectric material fills the space between the electrical component and the housing to eliminate air gaps or spaces and to surround the electrical component. The dielectric material is formed from a curable resin composition that includes a base resin, such as an epoxy resin, a flexibilizing agent, a curing agent and an amount of a resilient and compressible filler. The resilient and compressible filler is particles of thermoplastic microballoons having a particle size of about 90 microns to about 110 microns.

Abstract: Improved cleaner-drier compositions completely free of environmentally objectionable chlorinated solvents are provided which include a combination of diacetone alcohol and a terpene fraction such as d-limonene alone or in combination with other terpenes. The diacetone alcohol/-terpene fraction combination should comprise at least about 80% by weight of the overall composition, and the ration of diacetone alcohol to the terpene fraction should be from about 0.4-1.9. The most preferred composition is a 60/40 w/w mixture of diacetone alcohol and d-limonene.

Abstract: Improved synthetic resin insulators having enhanced arc track resistance and reduced UV light degradation characteristics are provided which include a continuous resin phase and a discrete, discontinuous hydrophobic phase in the form of discrete, suspended droplets within the resin. The preferred insulators are formed of a continuous epoxy matrix having suspended droplets of petrolatum dispersed therein. The resin phase comprises from about 15 to 50% by weight of the composition, whereas the hydrophobe is present at a level from about 2 to 10% by weight. UV light resistance is improved by predissolving or predispersing a quantity of UV light absorber in the hydrophobe before the latter is mixed with the resin phase. Use of a hydrophobe which is solid at normal temperatures but which melts above about 80.degree. F. (such as petrolatum) results in lower dust attraction during ordinary conditions and the ability to melt and effectively encapsulate surface dust during periods of increased arcing activity.

Abstract: Improved arc-suppressing fuse tubes of the type used in electrical cutouts is provided which includes a fluid epoxy resin matrix core designed, upon experiencing high temperature arcing conditions, to generate sufficient moisture and arc-suppressing gases to safely and efficiently interrupt an arc. The fuse tubes of the invention completely eliminate the use of expensive and difficult to fabricate bone fiber conventionally used in fuse tubes of this type. The preferred fuse tube construction is an integrated, synthetic resin body having an outer tubular shell including an epoxy fiberglass-reinforced synthetic resin matrix, together with an inner tubular arc-suppressing core having an epoxy resin matrix with respective quantities of an organic fiber and an inorganic filler therein. An anhydride curing agent for the epoxy is incorporated at an anhydride to epoxide ratio from about 1.0 to 1.4:1.

Abstract: An improved tower foundation is provided which is inexpensive to manufacture and when installed, serves to securely support a leg of power transmission towers and the like. The tower foundation hereof includes a screw-type earth anchor member having a tubular cavity at the uppermost end thereof. An elongated tower leg connector member is positioned and secured in the cavity of the installed anchor by an initially flowable, solidified material (preferably a sand/epoxy resin mixture). The tower leg connector member advantageously comprises a lowermost, tubular first portion and an uppermost, L-shaped in cross-section second, apertured connection portion, with the first and second portions having approximately coincidental centroidal axes.

Abstract: An improved tower foundation is provided which is inexpensive to manufacture and when installed, serves to securely support a leg of power transmission towers and the like. The tower foundation hereof includes a screw-type earth anchor member having a tubular cavity at the uppermost end thereof. An elongated tower leg connector member is positioned and secured in the cavity of the installed anchor by an initially flowable, solidified material (preferably a sand/epoxy resin mixture). The tower leg connector member advantageously comprises a lowermost, tubular first portion and an uppermost, L-shaped in cross-section second, apertured connection portion, with the first and second portions having approximately coincidental centroidal axes.

Abstract: A novel cleaning and drying composition is disclosed which has a number of unique properties rendering the composition particularly useful for cleaning and refinishing electrical equipment and tools. The composition preferably comprises about 30% ethanol, 50% methylene chloride, 15% 1,1,1-trichloroethane and 5% perchloroethylene; this combination of ingredients gives a final product that dissolves water and many organic materials while at the same time having a high evaporation rate and flame resistance (flash point greater than 100.degree. F.). The composition also gives a visual indication of the need for recleaning and replacement thereof by becoming cloudy when excessive moisture has been absorbed.

Abstract: An arc track resistant, high voltage, filled synthetic resin insulator is disclosed which exhibits a wide range of desirable qualities heretofore unobtainable with any single type of prior insulator. The insulator hereof unexpectedly gives excellent arc track and flame resistance, along with a flexibilized yet rugged construction having good weatherability properties. These qualities are achieved through use of a relatively critical selection of components and proportions which also facilitate cast construction of the insulators by giving a pourable, yet highly filled liquid casting composition during the fabrication stage. The insulators include critical quantities of hydrated alumina (from about 60 to 75% by weight) and a synthetic resin matrix having expoxidized castor oil (18 to 24% by weight) and a glycidyl rigidizer therein, along with a curing agent and accelerator.