Why can I not order Plenum or Riser with inexpensive PP rope installed?
• Underwriters Laboratories requires that any product being installed in a Plenum or Riser area of a building meet all testing requirements, this includes any type of pull line that is shipped with the innerduct or raceway. UL is concerned that the PP rope which burns easily and smokes a great deal may not be removed and thereby increase the risk of a dangerous fire/smoke condition if a fire should develop.