The only speaker cable that I have ever seen that is UL approved CL3 rated is of a jacketed design. I haven't seen any of the zip cord type cable that is CL3 rated. Monster Cable
makes some relatively inexpensive 16 and 14 gauge cable designed for basic systems. Don't pay attention to the prices listed, you can get it much cheaper. Genesis Cable
also is a good source for this type of cable.
The is nothing in the NEC that would prohibit this speaker cable and NM cable from sharing the same bored hole but I definitely wouldn't recommend it. Keep speaker cables as far as you can from any AC lines to avoid picking up noise. Crossing the lines is fine but don't run them in parallel very far.
[This message has been edited by caselec (edited 04-15-2003).]