Out of curiosity...
In some areas of the US instead of the usual crossarms on poles carrying the power distribution lines, there is a system described as follows: A grounded cable runs from pole to pole, suspended from a short metal arm that holds it away from the pole. This cable has several insulating hangers hanging from it, about four between two adjacent poles. These hangers carry three insulated cables, the three phases. The four cables are held in a diamond configuration by the hangers. They are only about 9" apart.
Does this system have a name? Perhaps a brand name? What voltage is the max. this system can use?