Hey there! I'm a local mapper from Scotts Valley, California. I see that you requested a review of this changeset, so I'm giving it a review.

I will admit that I have no clue about powerline voltage. That being said, since I don't have a clue about it, this changeset and others could really be improved if you added a source to your changesets (see OSM wiki about this: https://wiki.openstreetmap.org/wiki/Key:source#How_to_use_on_changesets).

When you add a source, you can say how you figured out the voltage of these powerlines. Perhaps you are referring to some kind of other map that shows these voltages. In that case you could provide a link to that map.