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Public-images-osm logo.svg line = bay
A power line within a substation which connects a circuit to a busbar. Edit this description in the wiki page. Edit this description in the data item.
Group: power
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Useful combination
See also
Status: approvedPage for proposal

A bay is a power line within an electrical substation which connects a circuit (such as a power line or transformer) to a busbar.

Each bay typically includes circuit breakers, disconnectors, instrument transformers and surge arresters. It is suggested not to tag all these individual components. However, the circuit breaker may optionally be tagged as a switch.

Key Value Comment Recommendation
power line Defines this way as a generic power line. Mandatory
line bay Identifies the line as a bay. Mandatory
cables <3,6,..> Normally bays should be mapped individually per circuit. However, if for some reasons the mapped way represents more than one circuit this should be indicated using the cables tag; e.g., cables=6 for two bays. Recommended
voltage <voltage> The voltage of the bay. Recommended

Substation components

A typical substation comprises at least the following components:


Gray: Substation
Cyan: Power line
Blue: Bay
Green: Switches, etc.
Purple: Busbar assembly
Red: Transformer

See also

  • line=busbar - Identifies a power line as a busbar, the central connection in a substation.
  • power=substation - A facility which controls the flow of electricity in a power network with transformers, switchgear or compensators.
  • power=transformer - A device for stepping up or down electric voltage. Large power transformers are typically located inside substations.
  • power=switch - A device which allows electrical network operators to power up & down lines and transformers in substations or along the power grid.
  • power=portal - A supporting structure for power lines, composed of vertical legs with cables between them attached to a horizontal crossarm.