NFPA 58 Liquefied Petrolium. Does the 5 ft and 15 ft sphere extend below grade (gravel base). Light pole base installed in the 15 foot radius
I will give you my take based on NFPA-70 2017 NEC (there are many changes).
To me, I would call that Bulk Storage. I'd use Article 515, 2017 NEC if I were doing an electrical plan review. I would still consult Article 514. But I'm not convinced from the picture that what I see there is a "motor fuel dispensing facility." But maybe it is.
3-foot from outdoor equipment (where flammable vapor-air mixtures can exist under NORMAL operating conditions) would be Class I, Division 1
After that, the area between 3-foot and 8-foot of any equipment would be Class I, Division 2.
Take a look at Table 515.3 when you have time. Thanks for the pic. It probably saved a lot of time, and got right to the question. The problem that I usually run into most of the time - is gas stations that seem to want to put a light pole right next to the tank. Or, they already have the tank and then decide to "add" a light pole without consulting the AHJ. If I had to guess, that pole base is 6 to 8 feet away from piping. And I don't know how high the pole will be. That piping would only leak in the event of accident (accident is Class I, Division 2 designation). Remember - I can't see all the dispensing valves and what not from the picture. You could always play it safe and ask for a fixture - that if the lamp breaks - there will be no hot filament. They will probably use an LED anyway; that is what is popular these days. I think you have a valid concern but I think it will probably be OK, based on the picture only.
Is there an approved plan? I always ask for an engineered plan, showing the classification of the hazardous areas and also THE BOUNDARIES of the classified areas. A plan makes things simple. I would normally try to require an engineer that is familiar with explosion hazards. I've found that most electricians and some engineers simply don't understand (nor care to understand) hazardous locations. The electrical trade is in dire need of professionals these days. I hope we get some real soon. Codes help, but installers who don't care about education make it impossible for the codes to do their job. We have many "old dogs," and also many "young dogs," that don't want to learn the new tricks. But now I'm getting off track...
I see something on the conduit for the receptacle and I'm not sure if it's a coupling, or a seal fitting. Usually a seal fitting is required somewhere within 10-foot of any boundary (for instance, going from Class I Div 2 to an unclassified location).
I also see switches? but can't see what they go to. I'd make sure if that they are properly rated for the classification, and also the flexible "whatever it is" being used with the switches. Is that extra-hard usage cord? Just thinking out loud...
Is that a yellow extension cord I see? That might concern me, too.
I see that this is all installed in what looks to be some sort of residential neighborhood. My concern would be - is the tank at least 10-feet away from the public way? I can't tell if there is any separation distance there.
I assume you are referring to the requirements in Table 18.104.22.168 for the Class I Div 1 and Div 2 separation requirements. The code seems to require the Div 1 separation to go below grade by requiring 5 ft in all directions. However, the Div 2 requirement ends at grade, ground level.
Richard Fredenburg, LP-Gas Engineer, North Carolina Department of Agriculture and Consumer Services
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