

  1. straps or staples
  2. cable ties or hangars
  3. similar fittings designed and installed so as not to damage the cables
  4. any of the above

Answer: D

Article 640 outlines the requirements for installation of audio signal processing, amplification, and reproduction equipment. More specifically, 640.6(B) focuses on the installation of audio distribution cables. Any of the products noted in answer options above are permitted by this section of the NEC. Also, note that the cables shall be installed in such a manner that they will not be damaged by normal building use.
