Which of the following precautions are necessary when using any electrical equipment in a hazardous location, such as a cargo pump room?

Correct Answer: Option D — All of the above.

Hazardous locations like pump rooms require strict adherence to 46 CFR safety standards. Ensuring the space and adjacent compartments are gas-free and secured prevents the migration of flammable vapors to ignition sources. These combined precautions are essential to mitigate the risk of explosion during maintenance or cargo operations.