California Electrical Contractor (C-10) License Practice Exam

A fixture that weighs more than 50 pounds must be supported independently of an outlet box. This requirement is based on electrical code regulations, which dictate that heavier fixtures can exert significant stress on outlet boxes, potentially leading to damage or safety hazards. Support structures are critical for ensuring that such heavy fixtures do not compromise the integrity of the electrical system or the safety of the installation.

When fixtures exceed this weight threshold, the risk of the outlet box failing to hold the weight increases, leading to potential dangers such as falling fixtures, electrical shorts, or creating unsafe conditions. Therefore, ensuring independent support for these fixtures is an essential safety measure in electrical installations.

The other weight options (25 lb, 40 lb, and 60 lb) do not meet the criteria set forth by the relevant codes for independently supporting heavy fixtures, confirming that 50 lb is the appropriate threshold.