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Public-images-osm logo.svg design
Osm element key.svg
Describes the type of pylons carrying high voltage electricity cables Edit
Used on these elements
may be used on nodesshould not be used on waysmay be used on areasshould not be used on relations
Status: de facto

This tag describes the type of pylons carrying high voltage electricity cables. The main parameters are the number and positions of cross-arms. Cross-arms which only serve as support for earth wires should not be considered. See examples with suggested values below.


Picture Key Value Description
Einebenenmast (110 kV)
design one-level A tower having cross-arms at a single level only.
150 kV tower (Netherlands)
design two-level A tower having cross-arms at two levels.
400 kV tower (Denmark)
design donau A common sub-type of the two-level tower. It is characterized by having one conductor on each side at the upper level and two conductors at each side on the lower level. The "Donaumast" is widely used in central Europe.
design three-level A tower having cross-arms at three levels.
Power lines with fog, Milan.jpg
design barrel A common sub-type of the three-level tower. It is characterized by the middle level cross-arms being longer than the upper and lower cross-arms giving the conductor arrangement a barrel-like shape.
Electricity pylon DSCI0402.jpg
design asymmetric A two- or three-level tower carrying only one circuit and having the conductors arranged in an asymmetrical layout.
60 kV tower (Denmark)
design triangle A sub-type of the asymmetric tower. It has cross-arms at three levels providing a triangular arrangement of the conductors.
60 kV angle tower (Denmark)
design flag A sub-type of the asymmetric tower. All conductors are located at one side which forms the tower a flag shape, hence the name. It can also be shaped as a letter "E" if the tower is seen on a left or right side and a non-triangle-shaped conductor is used. The tower typically has no or only rudimentary crossarms. This tower type is usually used as an angle tower.
design donau;one-level A three-level combination tower effectively being a Donau tower having an additional lower level, often used for circuits of a lower voltage than those at the upper levels. This tag better describes the design than just using "three-level". Similar tag values may be used for other designs having an additional lower level.
Pylon Shenzhen.jpg
design four-level,
A tower having cross-arms at four or more levels. These tall towers may carry four or more circuits.
150 kv tower (Denmark)
design delta A y-shaped tower having a horisontal cross-beam between the two top structures. All conductors are attached to the cross-beam. It is mostly used for a single circuit.
150 kV tower (Netherlands)
design delta_two-level
Delta tower having two or three cross-beams. Suitable for three circuits.
400 kV tower (Denmark)
design y-frame Similar to delta tower but there is no horisontal cross-beam between the two top structures. The middle conductor is supported directly by the top structures.
design x-frame A variation of the y-frame tower having two legs. It is suitable for carrying a second lower voltage circuit on a crossbeam below the joint.
60 kV wooden tower (Denmark)
design h-frame A tower type having two (or more) separate pylons or poles connected by a beam to which the conductors are attached. The cross-beam extends beyond the vertical structures such that not all conductors are located between the vertical structures. The portal tower is mostly used for a single circuit.
33 kV wooden tower (UK)
design h-frame_two-level
Designs like the h-frame tower, but having cross-beams at two or three levels.
design guyed_h-frame A guyed version of the h-frame tower supported by guy wires, common in e.g. Scandinavia. Compared to the self-supporting h-frame tower this design normally has non-vertical legs. This detail is useful for distinguishing self-supporting towers from guyed towers in aerial imagery etc, since the guy wires are usually too thin to be directly visible in such imagery.
Portal tower at Kassø substation (DK)
design portal A tower type having two (or more) vertical structures connected by a horizontal cross-beam. All conductors are supported between the vertical structures (unlike the h-frame tower). This design is mostly used as termination tower at substations.
design portal_two-level,
Two and three level versions of the portal tower.
735 kV tower (Quebec)
design guyed_v-frame A guyed tower type that is mainly used for ultra-high voltage lines e.g. in North America.
380 kV Wintrack tower
design bipole A pair of closely spaced but non-touching pylons. The conductors are typically mounted between the pylons. There are no cross-arms. Known as 'Wintrack' in the Netherlands. The bipole should be mapped as a single tower.
400 kV anchor towers (Denmark)
design monopolar A tower having no cross-arms, with insulators mounted on the tower itself. Mostly used as an anchor tower at very high voltage.This tower type is typically used in groups of three, with each carrying one phase, but may carry all phases in one tower. There are two recommended options for mapping such a group. Either map all three towers and connect the power line to the middle tower. Or map only one tower and add the attribute triple_tower=yes to the tower.
design:name * When the tower design has been given a specific name by its designer it can be indicated by this tag, such as Wintrack (The Netherlands), Eagle (Denmark).