As e57 mentions, 392.6 will be applicable and then I would suggest looking at 394 through 398 also to see if any of the "shall's" or "shall not's" might apply.

Of course it sounds as though there are no Insulators so 398 goes away, and there is no Messenger so 396 goes away, and there are no "Knobs or Tubes" so 394 goes away. [Linked Image]

Roger