[Tagging] Power=cable for low voltage lines?

Greg Troxel gdt at lexort.com
Mon Oct 15 22:20:45 UTC 2018


Fran├žois Lacombe <fl.infosreseaux at gmail.com> writes:

> Basically in power language, a line is not insulated while a cable actually
> is.

A difficulty here is that mappers cannot tell a protective covering from
insulation.  I was at an open house of my power company recently and
they had a mockup of a distribution line, of 8 kV phase to ground (as
part of 13.8 kV 3-phase), connected to a transformer, and then 120/240
from the transformer to the meter - all very normal in the US.

However, I was told that the protective covering on the 8 kV line is NOT
insulation, even though it looks much like it.  It's there for abrasion
resistance to slow corrosion, and perhaps for added mechanical strength,
but it does not meet insulation specs.

So I don't see how we can make "insulated" a big deal in tagging,
defining the top-level tag, rather than being a detail to add when
known.

That said, I fully support your notion of tagging voltage, so that
low-voltage lines can be rendered only at extreme zooms, and to assume a
line is low voltage (240V seems like a reasonable default assumption in
terms of controlling rendering) if not tagged.



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