Navigation planks on telephone poles.

[Lomaster]

I'm familiar with those large vertical 街区表示板 that clearly indicate 区 then 町 then 丁目 and finally 街区, and their smaller versions that include 番号.

Now i'd like to learn how to read those smaller vertical planks on telephone/lamp poles. I've noticed that there are two types of them.
There's a rectangular type, that seems to indicate a 町 followed by 幹　or 支, also specifying whether it is 東　西　北　南 or 元 road.
Followed by a single number for 幹 and a pair of numbers with　右／左 for 支.
Then there's another type with rounded edges, that indicates a horizontal number with katakana attached to it, followed by a horizontal number and finally another horizontal number.

While the information appears to be deducible given enough time and effort (and maps), i hope someone can explain the way to read those planks here, or provide a link to standards, regulating them (i bet the planks are standardized)

 

[Mike Cash]

You would have to ask the electric company. Those are for the power grid, not street addresses.

 

[Lomaster]

Oh. Now those 幹　and 支 make more sense. Just thought that learning to read them would be handy, 街区表示板 are not as pervasive as those power grid planks. Thank you, Mike!