Which of the following could be used in a concrete slab?

• A. ENT
• B. LFMC
• C. Schedule 40 PVC
• D. All of these

Answer: (D)

In-slab raceways must be listed for concrete embedment and installed according to their listings. When a conduit or tubing is specifically rated for embedment in concrete, it can be used inside a poured slab.

Schedule 40 PVC is a standard choice for embedded work because it resists moisture and is designed for concrete applications. Flexible metal conduit can also be used in a slab if the particular LFMC product is listed for concrete embedment and the installation protects it from damage. Electrical nonmetallic tubing can be used too, provided the exact product used is listed for concrete embedment.

So, all of these options can be used in a concrete slab when they’re listed for embedment and installed per code.