Flexible cords in Class II, Division 1 or 2 locations must be what, except for pendant luminaires?

In Class II, Division 1 or 2 locations, flexible cords must be listed for extra-hard usage to ensure that they can withstand the specific environmental conditions typically associated with these areas. These locations may have a higher risk of exposure to hazardous materials or conditions that require enhanced durability and safety measures.

Cords that are listed for extra-hard usage are designed to resist abrasion, impact, and other physical stressors that may occur in demanding environments. This is particularly important in locations where the potential for electrical hazards is elevated, as any failure in the cord could lead to dangerous situations. Thus, having cords specifically rated for this type of application significantly increases safety and reliability.

The other options do not specifically address the critical requirements for flexible cords in these hazardous locations. Standardized for all types does not actually reflect the enhanced protective features necessary for the rough conditions expected in Class II areas, while flexibly installed refers to the installation method rather than the cord's inherent properties. Approval by local authorities is relevant to compliance but does not specifically indicate the suitability of the cord for the environmental challenges present.