Those sections are for combustible materials in relation to the luminaire, which could apply to the OP, but at same time a "cage" doesn't provide much of a barrier from falling hot particles like a lens or diffuser. A cage is more for protection from physical abuse. There are cases where the lamp needs to be guarded but I am not aware of a "cage" being the required method anywhere in the NEC, and some instances something more enclosed/self containing is required by NEC.
Food processing areas typically do require a containment method for broken lamps, as well as other processing that requires sanitary conditions, like pharmaceutical products. These are not NEC requirements they are requirements by regulating agencies that are associated with those industries. A wire cage will not contain a broken lamp. Tube guards do not prevent the lamp from breaking but the idea is to contain all of the lamp within the guard if it does break. The best solution that has become more popular is teflon coated lamps - usually called shatter resistant lamps. The lamp can still break but the contents remain inside the teflon coating when it does.
