I know of some who like to have the romex pulled tight between staples, around corners, and even on home runs in the attic. And have it tight all the way into the box. They run the staple down enough that it won't pull through when the cable is "pulled tight". I like the staple to make "light" contact, so that the cable is secure, and then sweep it generously at corners etc. My premis is that the conductors will be expanding and contracting from seasonal temp. changes, especially in the attic. Also from some heating at heavy loads. It needs to move. If it's pulled and stapled tight it will someday rub through the cover and short, possibly start a fire. Am I overboard here? So many guys pull tight that it appears to be ok. Are there any instructions in print by the manufacturers?
I agree I do not staple romex "tight" and I try to leave slack around bends and boxes. I do service work now days and hate it when there is no way to get any extra wire without tearing up the walls or pulling new wire or adding/moving boxes. Rod
When I first started I made my romex tight and very secure and bleh bleh. Now I have realized that it is a waste of time to staple any wire that is just running overtop of the trusses. I always leave some slack, not enough to where it is looping in the atic or that I feel somebody could be doing an attic walk and catch it with thier foot. Using spinners also helps this process along. Wiring should be the fastest process you do in the home. Boxing and cutting in should take the longest time followed by strapping. Today it took me from 7am until about noon to box the house, from bout 1 until 3 I had half the house wired:-) But then still to strap and cut in uggg heh.