A better answer is: depends.
Many local codes permit use of UL Listed non-insulated staples driven by staple guns as an alternative to hammer-in insulated staples, because of the gun’s controlled staple driving depth. NO DAMAGE TO THE WIRE!
I normally see them with a sadle or an insulator under the staple in my area. The uninsulated ones require special tools.
NEC 2005 code 334.30 that reads in part “nonmetallic-sheathed cable shall be secured by staples designed and installed so as not to damage the cable.”