Based on the 2017 NEC

by Mark Lamendola

National Electrical Code Top Ten Tips: Article 514 -- Motor Fuel Dispensing Facilities

  1. Article 514 covers any structure used for storing or dispensing fuel from fixed equipment. It also applies to fuel dispensing facilities for fleets [514.1].
  2. Article 514 distinguishes between locations handling Class I liquid fuels and those handling three other fuels: compressed natural gas, liquefied natural gas, and liquefied petroleum gas [514.3].
  3. Table 514.3(B)(1) defines Class I locations for the purposes of Article 514.
  4. Table 514.3(B)(2) defines electrical equipment classified areas for fuel dispensing.
  5. Equipment covered by Table 514.3(B)(1) must be wired per Article 501 [514.4].
  6. Equipment located above equipment covered by Table 514.3(B)(1) must also be wired per Article 501 [514.7], as if it is actually equipment covered by Table 514.3(B)(1) [514.4].
  7. Install underground wiring in threaded metal conduit, not EMT or PVC [514.8]. Some exceptions apply.
  8. Provide a listed seal in each conduit (here, we can refer to the raceways as conduit because in this case they are) entering or leaving a dispenser. The sealing fitting must be the first fitting after the conduit emerges from the earth or concrete [514.9(A)].
  9. In addition to the dispenser seals, provide seals at the horizontal and vertical boundaries of the defined Class I locations  [514.9(B)].
  10. Ground and bond all metal raceways and metallic objects [514.16], taking care not to confuse grounding with bonding [Article 100]. Grounding and bonding are not interchangeable procedures, and they do not accomplish the same things. If in doubt, bond instead of ground.