What type of electrical wiring is considered combustible?

Non-metallic sheathed cable, often referred to as NM cable, is classified as combustible. This type of wiring is typically made up of insulated conductors that are encased in a non-metallic sheath, such as vinyl, which can ignite and support combustion under certain conditions. The materials used in the sheath can catch fire, especially if exposed to high temperatures or direct flames, making it paramount that proper fire safety measures and codes are followed during installation.

In contrast, metal conduit wiring and armored cable are composed of materials that inherently resist combustion and provide additional protection against environmental factors. Low-voltage wiring typically operates at a voltage level that reduces the risk of ignition, further distinguishing it from combustible materials. Understanding these distinctions is crucial for ensuring compliance with safety standards and building codes, as selecting the appropriate wiring can significantly impact fire safety in commercial applications.