What is described as a raceway that contains multiple electrical outlets within a single enclosure?

A multi-outlet assembly is specifically designed to contain multiple electrical outlets within a single enclosure, serving to simplify the distribution of power to various devices in a given area. This type of assembly allows for a streamlined installation process, as it reduces the need for separate outlet boxes, making it ideal for both residential and commercial applications where several outlets are needed in close proximity. It provides convenience and access to power while maintaining safety and compliance with electrical codes.

The other choices do not fit this specific description. A modular raceway generally refers to a system that allows for the organized routing of electrical conductors or cables, but it does not specifically focus on multiple outlets within one enclosure. An expansion fitting is a component used to allow for the physical expansion of raceway systems, ensuring that the system remains intact and functional over temperature fluctuations but does not serve the purpose of housing outlets. An outlet box is a housing unit for electrical connections but typically accommodates only one or two outlets rather than multiple outlets packed into a single assembly.