I was also under the impression that if wiring is in an attic space that it may need to be derated because it can get very hot up there.
Running wires into attic.
Cut a hole for each box with a drywall saw or a saw appropriate for the wall material then feed the wires down from the attic or up from the basement toward each hole using a fish tape or a fish stick.
These holes will be used to fish the cable down into the basement or crawlspace area or up into the attic in order to run the cable from box to box.
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Warning if the attic is your only access space for running cable you may find it necessary to cut another small hole in the wall surface high on the wall in order to gain access for drilling.
If drilling up through the ceiling expect to pass through a thin coat of plaster and 5 8 of sheet rock and 1 2 inch 1 3 cm of strapping to which the sheet rock is secured.
Run security camera wires caution.
If you re working from the attic you can drop a weighted string down wall cavity then attach the wire to the string and pull it through.
Run the wire or cable to its destination.
To run the wires inside rigid conduit you ll need a hacksaw a pipe bender capable of bending 1 2 in.
To run cables vertically go into the attic or basement and drill holes in the wall plates above or below the locations of connection boxes.
While one person holds the flashlight the other person should use a staple gun to run the wire along the rafters from one entry hole to the other.
I just got back from my attic and realized i can t access the soffit from there.
Protect the wall with a thin piece of cardboard etc.
Bring all of the wire up into the attic.
And while loosely guiding the bit with one hand apply even pressure with the other holding the drill while running it.
Running wires inside rigid conduit.
If this meets code then i will be running attic wiring in this manner from now on.
The staple gun should be loaded with wire staples designed for holding the size and type of wire you are running.
The original plan was to run security camera wires up through soffit into attic down into basement but that no longer is an option.
Whenever i do attic wiring i remove the insulation and staple it to the ceiling joist.