Key:cables
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power Used combinations in
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This tag can be used to note the number of electrically separated power-carrying conductors in a power line (power=line) or a power cable (power=cable). Power transmission and distribution grids typically use three-phase alternating current (AC), so each circuit consists of three cables. Note however:
- Some circuits use only one or two cables, including:
- direct current (DC) transmission links,
- single-phase or split-phase AC circuits for:
- electric railroads,
- 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.
- Multiple independent circuits can share the same towers/poles or ditches. You may use multiple semicolon-separated values grouped by voltage (for example. cables=6;3).
- Currently, there is no generally accepted tag for noting the number of circuits.
- Each cable can be split into multiple (usually up to 4) wires that are close to each other and electrically connected. (This is done to increase the AC current carrying apacity of the conductor, as AC current tends to run best near the surface of each wire.) See wires=*.
- Do not include cables that do not carry power, such as:
- protective ground cables,
- telephone or other communications cables,
- guy wires (for mechanical support).
