The link below is an old thread from when UL first changed the rules. The link in the thread is no longer good, (UL is sorry in keeping their pages up [Linked Image] ) but it explained that rope lights were no longer allowed to be field cut for length.
https://www.electrical-contractor.net/ubb/Forum18/HTML/000066.html

Roger

Edited to add the link DOH!!!

[This message has been edited by Roger (edited 02-24-2007).]