Based on the 2017 NEC

by Mark Lamendola

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.
     
  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 slightly more than two 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 fixed wiring 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 or be constructed so as to prevent sparks or hot metal particles from escaping [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].