What must a raised plaster cover be marked with to increase the maximum number of conductors in an outlet box?

A raised plaster cover must be marked with the cubic-inch volume to effectively communicate the amount of space available for conductors within the outlet box. This marking is crucial for ensuring compliance with the National Electrical Code (NEC) and for maintaining safety standards. Proper identification of the cubic capacity allows electricians to determine how many conductors can safely be housed within the box, avoiding issues such as overheating or electrical failures that could arise from overcrowding.

Knowing the cubic-inch volume of the cover assists professionals in making informed decisions about the installation, especially in residential wiring applications where the number of conductors can significantly impact performance and safety. The capacity must be accurately assessed, taking into account factors like the size and type of conductors being used, as well as any devices or fittings included in the box. This ensures that the installation adheres to code requirements and supports safe electrical practices.