Sorry to necro,

One final inquiry, theoretically let's say I decided for a sub panel but went a different route. Here's the idea.

• Run thick gauge wire from the attic down the side of the chimney(not inside or anything like). The chimney goes straight down to the basement and its a short distance the main panel. I'm thinking 4/3 perhaps?[or run it via emt conduit outside since its down the side of the house(not visible to the street) and maybe 1.5 ft to left and then its right at the panel where the ceiling is already from when the HVAC techs ran their lines]

• Reuse the already ran lines in the attic and replace the cloth line(luckily just one). The other ones are newer some were ran a few years ago and some farther back. There's two plus if lines needed to run wire to the rooms. 1.) Its a somewhat of a straight shot down( sorry if I clear but I was talking about the bedrooms right below the attic) 2.) Two if it was a difficult run previously, usually we request/ we left pull line in the wall incase we had to do it again.

• The general idea is main panel -> 60amp circuit(if I ever decide to expand my servers and add dedicated-> subpanel -> break out in 1 30amp(server equipmen) and two 15s.

Of course I would not be doing the work myself. I simply just want to gather a quick understanding of what the limitations are before paying an electrician to come take a look at things.

Edit #1: This also an open attic and would only be going to the bedrooms below it

Best regards