Larry, the NEC defines temporary as 90 days or less.
Don, I agree with your answer, but not the reasoning.
When an issue comes up, I check the UL "White Book" for a little more clarification as to what the listing means.
In the case of welding cable, UL states that it is only rated for 100 volts, unless marked differently.
Then there is the issue of connectors. Most lugs and connectors are only evaluated for use with "ordinary" stranded wire. Very finely stranded wire ... welding cable, locomotive cable, whatever ... require connectors that are designed for use with them. In 'practical' terms, the approved connectors will have two set screws, bouble length barrels, etc.
[This message has been edited by renosteinke (edited 02-26-2007).]
