Luminaires installed in Class I, Division 2 locations must be protected from physical damage by what means?

In Class I, Division 2 locations, which are areas where flammable gases or vapors are handled or processed, it is crucial to ensure that luminaires are protected from physical damage to prevent ignitions that could lead to explosions or fires. The best means of protection is through the use of guards or by careful location of the luminaires.

Using guards provides a physical barrier that can help absorb impacts and prevent damage from accidental contact or collisions. Additionally, strategic placement of luminaires in areas where they are less likely to be exposed to physical hazards is an effective way to ensure their safety. This approach not only addresses the potential for physical damage but also adheres to the safety standards set forth in NEC regulations regarding hazardous locations.

Other options, while they might provide some level of protection, do not meet the specific requirements for robust safeguarding that is necessary in such potentially dangerous environments. For example, heavy casings might offer strength but could be impractical for installation and maintenance. Plastic covers, although lightweight, may not withstand certain impacts as effectively as guards. Glass enclosures, while offering some protection, are also more prone to shattering and do not provide the comprehensive safety ensured by guards or strategic location.