Question

which should be used when installing conduit in reinforced concrete?
fd double gang box
concrete box with breakaway ears
utility box with a raised device cover
standard device box stuffed with paper

Explanation:

When installing conduit in reinforced concrete, a concrete box with break - away ears is suitable. Break - away ears help in securing the box during the concrete pour and can be easily removed later if needed. The other options are not as appropriate for this specific application. FD double gang box is more for general electrical box setups in non - concrete specific scenarios. A utility box with a raised device cover is not designed specifically for concrete embedding. A standard device box stuffed with paper is not a proper solution for long - term and secure installation in concrete.

Answer:

concrete box with breakaway ears