A protective layer installed between the floor and Type FCC flat conductor cable to protect the cable from physical damage and may or may not be in corporated as an integral part of the cable. NFPA 70, 2005 ed
National Fire Protection Association, Illustrated Dictionary of Fire Service Terms, Jones & Bartlett Publishers, MA. USA 2006. https://books.google.com.kw/books?id=W0WIRa3Gl4QC& printsec=frontcover&source=gbs_ge_summary_r&cad=0# v=onepage&q&f=false, (Fr Srvc - Amer) {141}