Rating, Flame Spread : A relative measurement of the surface burning characteristics of building materials when tested in accordance with NFPA 255, Standard Method of Test of Surface Burning Characteristics of Building Materials
NFPA 805 Performance-Based Standard for Fire Protection for Light Water Reactor Electric Generating Plants, 2006 ed. http://www.nfpa.org/assets/files/AboutTheCodes/805 /805-F2005-ROP.pdf, (Std: Performance-Based Fr Prac for Light Wtr Reactor Electr Gen Plants - Amer) {350 NFC}