Key:voltage

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+/- voltage Description For describing the voltage of power lines, cables and overhead wires. Group Power Element help Tools for this tag Combinations worldwide in Australia/Oceania in Europe (list) in Asia (list) in Central America (list) in South America (list) in Africa (list)  (via overpass turbo - help)

For describing the voltage of any high voltage power line and cable. This can be high-voltage transmission line or even a overhead wire of train tracks, or on a street for trolley busses. Used for e.g. powerlines and railway electrification.

Any value should be in Volts without unit itself and without thousand note/delimiter. Value for a 15 kV wire is "15000". Not "15 kV", nor "15,000" or combinations of this.

The ITO Map electricity layer shows power-lines by voltage, allowing for quick analysis of the OSM data. The voltage levels shown are currently designed with the UK power grid in mind, but at a minimum the layer will still show whether a voltage=* is present or not.

How to get the voltage of a line/cable without touching it? Simple safety rule for transmission lines is this. The length of the isolator (separating wires from tower) is 1 meter per 100 000 Volt. 380 kV wires have isolators of ~4 meters long. Following this rule a 25 kV overhead wire use 0.25 m long isolators.

For a substation (power=sub_station) stepping up or down between different voltages, the voltages can be listed, separated by semi-colons.

Examples

A high-voltage transmission line with a voltage of 110 kV would use the following keys and values.

• power=line
• name=* or ref=* for Line name or number.
• operator=
• voltage=110000

An electrified railway track in Germany with overhead power supply would use these keys and values.

• railway=rail
• electrified=contact_line
• voltage=15000

Nearly the same for a subway with separate rail for power supply.

• railway=subway
• electrified=rail
• voltage=750

A street with overhead wires for trolley busses.

• highway=residential
• electrified=contact_line
• voltage=600

A distribution substation, stepping-down voltages for use by houses.

• power=sub_station
• voltage=11000;400

See also

• Railway electrification system (en)
• de:Bahnstrom (de)