Tag:power=branch

The Proposed power=branch relation is used to describe the intersection between multiple power lines, mapped as either ways or the Proposed power=circuit relations. This page was created due to the proposal being adopted by the NGED Import Project and as a result the number of uses will rise dramatically. At the time of writing the information in this page matches the proposal and the usage by the NGED Import Project but always refer to proposal.

Tagging

Relation

A relation of this type specifies two power lines mapped as either ways or power=circuit relations along with an optional node that is the intersection of the power lines.

Relation's tag	Member	Description
type=power	Required	The relation describes a power network feature
power=branch	Required	The relation describes a circuit branching
ref=*	Optional	If the branch is marked with ref number
*=*	Optional	Any tag that describes the connection itself

Members

Member's role	Count	Member	Description
trunk_circuit	One (or zero)	Trunk circuit's relation	Recommended. May be omitted if the trunk circuit is not mapped with a power=circuit relation, and trunk_line member is recommended in this case.
branch_circuit	One (or zero)	Branch circuit's relation	Recommended. May be omitted if the branch circuit is not mapped with a power=circuit relation, and branch_line member is recommended in this case.
via	One (or zero)	The point (tower) where circuits are connected	Recommended. May be omitted if the connection point is unknown or unmapped.
trunk_line	Zero or more	Trunk circuit's line (the way closest to the connection)	Optional. Recommended if the trunk circuit is not mapped with a power=circuit relation (because there is no other way to define the line when a relation is absent). May be omitted if the trunk circuit is mapped with a power=circuit relation (because a line is defined in the relation)
branch_line	Zero or one	Branch circuit's line (the way closest to the connection)	Optional. Recommended if the branch circuit is not mapped with a power=circuit relation (because there is no other way to define the line when a relation is absent). May be omitted if the branch circuit is mapped with a power=circuit relation (because a line is defined in the relation).

Example

The substations "H" and "K" are connected with two power circuits marked as "H-K.1" and "H-K.2". At the line segments 9 and 10 both of the circuits run on the same towers. Towers 1 and 2 are branch pylons where a brach circuits are connected; so trunk circuits at the line segments 3, 4, 5, and 6 run separately. The substation "T" connects to the trunk line with branch circuits marked as "Br.T.1" and "Br.T.2". The circuit "Br.T.1" (segment 7) is connected to the trunk circuit "H-K.1" at the pylon 1, and the circuit "Br.T.2" (segment 8) is connected to the trunk circuit "H-K.2" at the pylon 2. Then both of the branch circuits run on the same towers to the substation "T".

The relation for "H-K.1" circuit:

Tag or role	Key	Value or member
tag	type	power
tag	power	circuit
tag	ref	H-K.1
tag	cables	3
role	line	Ways 9, 3, 5, 10
role	endpoint	Substation "H", Substation "K"

The relation for "H-K.2" circuit:

Tag or role	Key	Value or member
tag	type	power
tag	power	circuit
tag	ref	H-K.2
tag	cables	3
role	line	Ways 9, 4, 6, 10
role	endpoint	Substation "H", Substation "K"

The relation for "Br.T.1" circuit:

Tag or role	Key	Value or member
tag	type	power
tag	power	circuit
tag	ref	Br.T.1
tag	cables	3
role	line	Ways 7, 11
role	endpoint	Substation "T", Tower 1

The relation for "Br.T.2" circuit:

Tag or role	Key	Value or member
tag	type	power
tag	power	circuit
tag	ref	Br.T.2
tag	cables	3
role	line	Ways 8, 11
role	endpoint	Substation "T", Tower 2

The relation for the first connection:

Tag or role	Key	Value or member
tag	type	power
tag	power	branch
role	trunk_circuit	Relation with ref="H-K.1"
role	branch_circuit	Relation with ref="Br.T.1"
role	via	power tower: node 1
role	trunk_line	power line: way 3
role	trunk_line	power line: way 5
role	branch_line	power line: way 7

The relation for the second connection:

Tag or role	Key	Value or member
tag	type	power
tag	power	branch
role	trunk_circuit	Relation with ref="H-K.2"
role	branch_circuit	Relation with ref="Br.T.2"
role	via	power tower: node 2
role	trunk_line	power line: way 4
role	trunk_line	power line: way 6
role	branch_line	power line: way 8