Composite optical fiber cable contains current-carrying conductors [770.2], and they’re capable of causing a dangerous spark that can ignite flammable atmospheres. In a hazardous location, you must install them the same way you install other conductors.

On the other hand, nonconductive optical fiber cable [770.2] has no current-carrying conductors or metallic strength members, so it can’t ignite flammable atmospheres. Consequently, you don’t have to install it in accordance with Articles 500, 501, 502, or 503.