Terroreign wrote in
roups.com:

Bill wrote:

The boxes are 120v to 90v transformers owned my Comcast.

BTW, Comcast's strategy (of going to 90v) appears to me to be an
interesting example of what I call "angle shooting". I don't know
enough to say whether it is in the spirit of the law or not. Isn't
90v equipment just about as potentially harmful to life and property
as 120v equipment?

Bill, thanks for your follow up in finding out what this was. I work
for a utility company and recently had stray AC current issues on our
system. One of the first things I noticed was this "Alpha Box" on a
utility pole near our system. Now that I have an idea what it is and
the voltages associated with it, I will be able to troubleshoot my
problem more efficiently.

It's actually a UPS, not just a transformer. There'll be
batteries inside the box, and an inverter.

It outputs either 63V or 87V. For reasons I don't know,
those are the standard voltages for cable distribution amps.

John