A polyphase cable includes a first conductor, a first shield including conductive material coaxially around the first conductor, and a first insulating material between and separating the first conductor and the first shield. The polyphase cable further includes a second conductor, a second shield including conductive material coaxially around the second conductor, and a second insulating material between and separating the second conductor and the second shield. In an example, the first shield is in physical contact, and in electrical contact, with the second shield. In an example, the polyphase cable is configured to conduct polyphase Alternating Current (AC) having a frequency of at least 100 Hertz (Hz) and/or at most 10,000 Hz. In an example, one or both of a first end and a second end of one or both of the first shield and the second shield are configured to be grounded.