What does the label "Suitable for thru-wiring" indicate on a luminaire terminal box cover?

The label "Suitable for thru-wiring" on a luminaire terminal box cover indicates that the terminal box is designed to allow multiple runs of electrical wiring through it without additional junction boxes. This feature is essential in lighting fixtures, as it enables efficient wiring setups, especially in scenarios where multiple fixtures need to be interconnected.

When a terminal box is marked as suitable for thru-wiring, it signifies that the box can support electrical connections to multiple circuits while maintaining compliance with safety standards. This is particularly useful in commercial and residential installations where several light fixtures are wired in series or parallel, simplifying installation and reducing the number of junction points.

This designation allows electricians to plan more effective wiring layouts and enhances the versatility of the luminaire in different installation contexts. Therefore, the option stating that either of the conditions is met correctly reflects the function and safety compliance of the terminal box as it relates to thru-wiring.