A practical $40 total cost inductive ballast for 15KVA pole pig
Get two spools of 400 feet of #14 wire from Lowe's . Zip tie each spool into a nice tight 8" coil. Submerge the coils in cold water with the winds facing each other. Turn on the ballast circuit and see if the coils are drawn together or pushed apart. In one particular measurement, when the coils were arranged so that they pushed apart, the overall circuit passed 67 amps, and when the coils were attracted together, the same circuit passed only 42 amps. The pushed apart coils submerged in water inductive ballast only costs about $40 to make, and is a great ballast, and heats shower or bathing water very quickly.
waterballast.mov (5445916 bytes)