Abstract: An electrical inductive apparatus encapsulated in a cured mixture of rounded gravel particles and resin-coated sand particles and covered with a layer of non-porous sealant material. A method of encapsulating an electrical inductive apparatus in which resin-coated sand particles are vibrated into a quantity of gravel particles which fill the space between the enclosure and the electrical inductive apparatus. A layer of sealant material is then added before the entire apparatus is subjected to an elevated temperature which cures the resin and forms an infusible, intersticial mass of gravel and sand particles around the electrical inductive apparatus.

Abstract: An electrical winding for electrical inductive apparatus such as a transformer or electrical reactor having at least one winding formed of non-magnetic, electrically conductive sheet, strip or foil, such as copper or aluminum. Magnetically conductive material is disposed between at least certain of the turns of the electrically conductive sheet material to create a low reluctance path for magnetic leakage flux parallel to the winding axis to reduce the magnitude of the radial component of the leakage flux.