Running wires in attic
I'm remodeling the top floor of my home. My breaker panel is on one end of the house and I'll need to run wires all the way across the house to the other end through the attic. I will also be connecting lighting and running daisy chain wiring up there to connect receptacles.
My question is regarding how to run the wire up there. If I need to cross from one joist to another do I just run it across or do I need to protect it with a strip of wood? Is running it along the roof rafters an option if I keep it low against the outside wall.
One more thing. When I run the 30 sets of cables from the panel, I will need to go across my garage space which is about 30 feet. Is there a good way to secure these wires as a group or do I need to run and strap each one?