> You can run composite cable if you desire copper, fiber and power.

Oooh. Cool.

By "power" do you mean 120/240VAC, or do you mean much lower voltage DC? I've found some Belden cabling that I think provides mains power and Ethernet, and I've found fiber cabling that I guess carries lower voltage DC, but am having a tough time finding a cable that combines fiber and copper data with mains power. Do you have an example of such a cable handy?

(Full disclosure: I'm refusing to spend more than like five minutes on the search... so I might have been able to dig up examples of such a cable.)

Which is why people run only copper because that costs less than running multiple types of cable everywhere when most drops only have one device, and then pull fibre through using the existing copper cable in the rare instances where they find a need for 40Gbps or more.

But then the copper gets used for 10Gbps connections instead of fibre because it's what's already in the building.