It is worth noting that most electrical services and to some extent mechanical services have a high component of plastic materials such as polyvinylchloride, polypropylene, polyethylene, synthetic rubbers etc. The risks associated with these combustible plastics are such that fire can and will spread or propagate through the services. Intensive combustion also means that plastics frequently release toxic and corrosive fumes that can include particulates, unburned fuel, carbon dioxide and carbon monoxide which are not only harmful to the building and its contents but also to its occupants. Such fires can also cause the following problems
fires cause the following problems
• Production of corrosive and extremely toxic gases,
• Long term destruction of construction and related equipment,
• Smoke development and toxic gases in corridors and escape routes,
• Difficult evacuation,
• Impede fire rescue activities by fire fighters.