When installing a shielded cable or a twisted pair cable in a Class I, Division 1 location where a cable seal is required, when is it not required to remove the shielding material or separate the twisted pairs of those type cables?

 

 

 

  1. Never.
  2. When the termination is made by an approved means to minimize the entrance of gases or vapors and prevent propagation of flame in the cable core.
  3. When the cable has on outer nylon jacket.
  4. When the shielded cables and twisted pair cables are taped with an insulating material along their entire length.

Answer: B

An Exception to 501.15(D)(1) states, "Shielded cables and twisted pair cables shall not require the removal of the shielding or separation of twisted pairs, provided the termination is by an approved means to minimize the entrance of gases or vapors and prevent propagation of flame in the cable core."

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.