Key:cables
 cables
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| Description |
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Number of electrically separated, individual or bundled, power-carrying conductors in a power segment, section or circuit.  
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| Group: power |
| Used on these elements |
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| Useful combination |
| Status: de facto |
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Power segments (line, cable, minor_line), sections (line_section) or circuits (circuit) are often composed of as many conductors as electrically separated poles or phases they carry or rely over. This key is intended to describe how many conductors we see in them.
In OSM, cables relates to conductors.
Power lines conductors may be individual (IEC ref 466-10-19) or bundled (IEC ref 466-10-20). See wires=* about this particular point.
Some power lines may hold several independent systems called circuits which share the same supports. cables=* doesn't care about them and count every conductor of the power line. Independent circuits may be described with relations and counted with circuits=*.
It then useful to count cables as to assess proper connectivity between line segments, particularly on points where they split, branch or cross. It is also useful as contradictory knowledge to assess circuits number consistency on the same segment.
Usage
Usually on terrestrial power systems, alternating current circuits are composed of 3 phases (cables=3) and direct current circuits are composed of 2 poles (cables=2).
We don't count earth wires, intended to prevent lightnings to disrupt overhead lines, as conductors.
On ground, you may look for wires bound to supports with insulation chains, with a length depending on the voltage. Insulation means the given wire is intended to transmit power.
Earth, guys or telecommunication wires aren't insulated the same way and shouldn't be counted on this basis to complete this key.
Please refer to the example below for suitable situations on which you can train on.
Some particular situations should be noted however:
- Some circuits use only one or two conductors, including:
- single-phase or split-phase AC circuits for:
- single wire earth return (SWER) medium voltage lines sometimes used in rural areas,
- supply to electric railroads (e.g., German traction power network),
- street lighting,
- small end customers (such as individual households).
- terminal branches of the 3-phase distribution grid that carry only 2 of the phases for an immediate connection to a small set of end customers.
- single-phase or split-phase AC circuits for:
- Do not include cables that do not carry power, such as:
- protective ground cables (also called earth wires),
- passive loop cables (to reduce the magnetic field),
- telephone or other communications cables
The key can be also used with power=switch on 
nodes.
Examples
| Photo | Location | Tagging | Comments |
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France | This power line supports 3 alternating current phases. It holds 3 conductor bundles insulated from the tower and 2 earth wires.
The correct value for | |
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England | This power line supports 6 alternating current phases. It is composed of 6 conductor bundles insulated from the tower and a single earth wire.
The correct value for | |
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New-Zealand | This power line supports 2 HVDC poles. It is composed of 2 conductor bundles insulated from the tower and a single earth wire.
The correct value for It is part of NZ Inter-Island HVDC bi pole system | |
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UK |
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This distribution power line 3 alternating current phases. It is composed of 3 single conductors insulated from the pole.
The correct value for |
See also
circuits=*Number of electrical circuits of power line or cable connection.wires=*Number of wires in conductors bundles of a power line or cable.cable_number=*Number of cables supporting simple-suspension/Tibetan style bridges