Testing for Flame Resistance of Electrical Cables

The National Fire Protection Agency (NFPA) publishes flame-resistance standards through its published National Electrical Code (NEC). Other agencies, such as UL and CSA also publish standards and also define certain tests for determining flame resistance (or lack thereof). Flame resistance requirements are for the most part governed by local and national codes which define the various levels of flame hazard, plus the severity of the fires to which cables may be exposed. The important considerations are propagation of flame, support of further combustion, generation and propagation of smoke. The NEC deals primarily with fire hazards in buildings, whereas UL and CSA deal with requirements based on use. What flame test are applicable? Small scale flame testing. CSA - Minimum mandatory horizontal flame test for Flexible Cord (Finished Cable). (1700 BTU - 500W). CSA- Vertical flame test performed only on the finished cable. Primarily used in the Equipment Wire or Appliance Wire (AWM) categories. (1700 BTU - 500W). UL and CSA- 1700 BTU - 500W Vertical flame test performed on the finished cable and also the insulated single conductors within that cable in flexible cords only.