Ends and joints for solid-floor conduit installations must extend above the floor and above grade by how much?

Ends and joints for solid-floor conduit installations must extend above the floor and above grade by how much?

• A. Ends extending not less than 2 inches above floor and vented at least 18 inches above grade on one side.
• B. Ends flush with floor.
• C. Ends extending 4 inches above floor and 12 inches above grade.
• D. Ends extending 1 inch above floor.

Answer: (A)

When installing solid-floor conduit, the ends and joints must be kept from being buried in concrete and also provided with a safe vent path. Extending the ends not less than two inches above the floor keeps them accessible and prevents them from being sealed inside the concrete during pours. Requiring a vent at least 18 inches above grade on one side ensures any gas that might migrate into the conduit has a clear route to escape, reducing the risk of gas buildup or ignition. That’s why extending the ends above the floor by at least two inches and venting the conduit at least 18 inches above grade on one side best meets safety and serviceability concerns. Other options fall short because they either bury the ends in the floor, provide insufficient extension, or omit the required venting height.

When installing solid-floor conduit, the ends and joints must be kept from being buried in concrete and also provided with a safe vent path. Extending the ends not less than two inches above the floor keeps them accessible and prevents them from being sealed inside the concrete during pours. Requiring a vent at least 18 inches above grade on one side ensures any gas that might migrate into the conduit has a clear route to escape, reducing the risk of gas buildup or ignition.

That’s why extending the ends above the floor by at least two inches and venting the conduit at least 18 inches above grade on one side best meets safety and serviceability concerns. Other options fall short because they either bury the ends in the floor, provide insufficient extension, or omit the required venting height.