Key:tensioning
 tensioning
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| Description |
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Specifies the type of tensioner on a catenary mast 
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| Used on these elements |
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| Requires |
| Useful combination |
Status: approved
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| Tools for this tag |
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Specifies the type of tensioner on a power=catenary_mast.
Description
The overhead contact line does not consist of a single contact wire that runs from the start to the end of the line, but is divided into sections that are up to approx. 1.5 kilometres long. This is for static reasons, as the overhead contact line should always have the same tension, but the length of the overhead contact line (material: copper) changes with the temperature. In addition to their function of holding the overhead contact line, some catenary masts have additional tasks. Some have the task of tensioning an overhead contact line section that is coming to an end.
How to map
Add tensioning=* to a power=catenary_mast. The following values are typical:
| Value | Description | Photos |
|---|---|---|
weights |
Tensioning the overhead contact line with weights |
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hydraulic |
Hydraulic assemblies | |
spring |
spring | 
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coil |
coiled leaf spring | 
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fixed |
no tensioning device, overhead contact line is firmly attached to the catenary mast | 
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yes |
if unclear which type of tensioning present or nothing else fits |
This tag is not used for overhead lines which merely carry the wire (or at most have a tensioning=no to denote other mappers that the power=catenary_mast has been checked for the tensioner) but rather only on masts which are attached directly to an overhead line. Masts which don't carry the line use catenary_mast:attachment=* whereas if they still do, have catenary_mast:supporting=* like most masts.