Which mounting method is NOT appropriate for luminaires attached to an offset bar hanger?

Using duct tape as a mounting method for luminaires attached to an offset bar hanger is inappropriate for several reasons. First, duct tape does not provide a secure or lasting attachment, which is crucial for ensuring that the luminaire remains safely in place. Over time, duct tape can lose its adhesive properties, especially in varying temperatures and environments, leading to potential hazards such as the luminaire falling.

In contrast, methods like using luminaire studs or No. 8-32 screws provide a stable and secure way to attach the fixture, ensuring that it is properly supported and aligned. Additionally, utilizing any mounting hardware provided is specifically intended for that purpose, designed to accommodate the weight and installation needs of the luminaire, further reinforcing the safety and integrity of the installation.