Which article specifies requirements for bulk storage plants?

The choice that specifies requirements for bulk storage plants is indeed Article 515. This article outlines the regulations and safety measures necessary for the storage and handling of flammable and combustible liquids.

Article 515 includes provisions related to the design, installation, and maintenance of electrical equipment and systems in bulk storage facilities, ensuring safe operation and reducing the risk of fire and explosion. The article specifically addresses aspects such as the classification of areas, proper grounding methods, and permissible types of electrical equipment that may be used in these environments. This helps ensure compliance with safety standards crucial to protecting both personnel and property in bulk storage operations.

In contrast, other articles such as Article 514 pertain to the requirements for the installation of electrical equipment in locations where flammable liquids are present, but do not specifically deal with bulk storage plants. Article 516 covers the requirements for the storage of hazardous materials, while Article 511 focuses on the classification of locations involving flammable vapors. Each of these articles has its own specific focus that does not directly pertain to the bulk storage of liquids as comprehensively as Article 515 does.