I once knew of a town that required all residential circuits be run in conduit.
Is conduit required in attic.
There are a few rules you need to follow but conduit is not one of them.
For this reason the nec has protection requirements for nm cables in an attic.
Damaged cables can cause a short circuit or even worse arcing that will start a fire in the attic.
A loose cable like in the photo above gets caught in the spring mechanism of a pull down folding ladder at the attic opening and frayed.
Using conduits will ensure that your wires are kept together.
I m building a new home outside the city limits in liberty county in texas my electrician ran the main power feed wire from the meter through the exterior wall up into the attic and down into the breaker panel without any conduit.
It will be easier to repair wires if there is a short in the line.
It is not required by the nec in a residential attic.