National Electrical Code Top Ten Tips: Article 514 -- Motor Fuel Dispensing Facilities
- 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].
- 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
- Table 514.3(B)(1) defines Class I locations for the purposes of
- Table 514.3(B)(2) defines electrical equipment classified areas
for fuel dispensing.
- Equipment covered by Table 514.3(B)(1) must be wired per Article
- 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].
- Install underground wiring in threaded metal conduit, not EMT or
PVC [514.8]. Some exceptions apply.
- 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)].
- In addition to the dispenser seals, provide seals at the
horizontal and vertical boundaries of the defined Class I locations
- 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