![]() On some lines built by EVS (now EnBW) the communication cable hangs like a garland on the ground conductor or a separate rope. Sometimes the line towers of lines for more than 1 kV carry an insulated communication cable, which can be either a separate cable or be part of the ground conductor. If this value is not-known, choose "20 kV" or "15 kV". If a pylon designed for a high-voltage line carries just circuits of medium-voltage lines, it should be classified as "line" with the voltage value. For classification as "line" or "minor_line", the highest voltage is relevant. Power line towers (or in some places, poles) can carry multiple systems with different voltages. Lattice towers, sometimes steel-tube towers (until 500 kV) or wooden poles (until 345 kV) Single (double, triple, or rarely, quadruple) Outdoor substations, rarely termination towers (sometimes surrounded by switchyard) or indoor substations Lattice towers, sometimes steel-tube towers or wooden poles Minor_line (up to about 45 kV only), line Indoor substations, poles (not surrounded by switchyard) Wooden, concrete, steel-tube, lattice poles Indoor substations, poles (not surrounded by switchyard), walls of buildings Wooden, concrete, steel-tube, lattice poles, also poles on rooftops A table with the most common properties for identification of line types can be found here Read more from her here.Nearly all power lines in the world are three-phase AC. Mary Boone is a freelance writer for Zillow Blog.
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