Final answer:
Sectional boxes can be used for receptacles in a concrete slab, adhering to the National Electrical Code or local building codes. They must be properly sealed and rated to prevent issues.
Step-by-step explanation:
The question pertains to the use of sectional boxes for receptacles in a concrete slab. In the context of electrical installations within a concrete slab, it is true that sectional boxes can be used, subject to the guidelines and regulations specified in the National Electrical Code (NEC) or similar local codes. These boxes are designed to be embedded in concrete and provide a secure enclosure for electrical connections.
When installing sectional boxes in a concrete slab, it is important to ensure they are properly sealed and rated for the environment to prevent any ingress of concrete or moisture, which could potentially cause electrical faults. Consultation with local building codes and possibly a licensed electrician is recommended to ensure that all installations meet the required safety standards and regulations.