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Public-images-osm logo.svg power = insulator
Power insulator.png
An electrical insulator which connects a power line to a support structure and prevents grounding. Show/edit corresponding data item.
Group: power
Used on these elements
may be used on nodesmay be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Useful combination
Status: in use

Insulators are devices which protect a power line from grounding when connecting (suspension or anchorage) it to a building or a portal. We also can find them hanging between two towers.

Power insulators can be tagged with power=insulator. Here is a non-exhaustive list of applicable situations:

  • Portals : On large portals, it can be useful to use insulators to map the link between the power lines and the way corresponding to the portal. It's mandatory to do so as for distinguishing suspension vs anchor on several lines linked to the same portal.
  • Any man made structure : As mentioned on Talk with the Cologne Bridge example, insulators may be useful to link power lines to uncommon supports, like bridges arms.

How to map

A power insulator is usually mapped with a single node, but rarely a way is used. You may tag them as follow:

Tag Value Description Recommendation
power insulator It's a power insulator linking an overhead line to another (grounded) infrastructure Mandatory
operator operator The power insulator operator's name. Recommended
line_attachment attachment Means by which the line is bound to a support Optional
line_management topology Particular topology occurring at the support Optional
line_arrangement arrangement Particular arrangement of the lin bundles seen at the support Optional
ref insulator reference Power insulator reference as seen in situation Optional
height height The height of the insulator from the ground Optional


Photo Location Tagging Comments
Power portal substation transition.jpg France


Support: Insulators are used to anchor the power line on a concrete portal. See node 2092465588.
French 400kV tower hanging insulators.jpg France


Not a support: Insulators hanging between two massive power towers. See node 3711147660.
Bahnstromleitung Südbrücke Köln.JPG Germany


Support with insulator on a Cologne bridge.