National Electrical Installation Standards

Standards as High as Your Own

 
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Friday, December 15, 2023

Question:

Hello Code friends, we are wiring a diesel fuel pump at a private business to serve the company’s truck fleet. Looking at the installation spec’s I am not seeing any classified hazardous locations. There are no other pumps gasoline, diesel, or otherwise, being installed. Does this mean that normal Chapter 3 wiring methods can be utilized? It does not seem correct to me. Thanks, Ralph M.
A

Answer:

Hi Ralph, thanks for your question. Generally, diesel fuel dispensing areas not considered classified locations.

Section 514.3(A) provides guidance on when a motor fuel dispensing area is considered an “Unclassified Location”. In areas where flammable liquids with a flash point below 38ºC (100ºF) are not handled, the area shall not be considered classified.

Conventional diesel fuel has a flash point greater than 38ºC (100ºF), as such it would not meet the criteria requiring a classified area per Section 514.3(C). The AHJ may request documentation on the type of diesel fuel being used to confirm the flash point and verify compliance. Also see the NEC® definition in Article 100 of Volatile Flammable Liquid. Hope this helps.

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