National Electrical Code Top Ten Tips:
Article 515: Bulk Storage Plants

1. Article 515 covers any portion of a property where flammable liquids are received and subsequently stored in bulk [515.1].
    
2. A property or portion thereof that qualifies for Article 515 requirements is a bulk plant or terminal [515.2].
    
3. For any bulk plant or terminal that is also a Class I location, you must apply Table 515.3 [515.3].
    
4. Table 515.3 is 3 three pages long and consists of four columns: Location, NEC Class I Division (1 or 2), Zone (0, 1, or 2), and Extent of Classified Area.
    
5. All wiring and in a Class I location that is a bulk plant or terminal must comply with the applicable provisions of Article 501 or Article 505 [515.7]. The exception to this rule is underground wiring.
    
6. Underground wiring in a Class I location that is a bulk plant or terminal must comply with 505.8.
    
7. Wiring above a Class I location that is a bulk plant or terminal must be in metal raceways, Schedule 80 PVC, or in one of a few other approved raceways [515.7(A)].
    
8. Any fixed equipment that might make arcs or sparks has to be of the totally enclosed type [515.7(B)].
    
9. Any gasoline dispensers in this area must comply with Article 514 [515.10].
    
10. Ensure there are no differences of potential between metallic objects. Per Article 250, don't ground metallic enclosures and raceways; bond them [515.16].