I have always “heard” underground is non classified so passing through an Area underground that is class 1 above ground wouldn’t classify that below ground as a hazardous location as long as the raceway didn’t come out and emerge out of the ground in any classified areas on either side . Like I said thats what I have just been taught not that I have seen for myself in the code so don’t take that as an answer. (although I should research myself)Little more info. We located a conduit running underground through a fuel dispensing area or gas pumps. The conduit runs across the class 1 div 1 area underground to feed a sign. WOuld a seal off be required at both ends, as it leaves store to the sign. does the class1 div extend underground?
Yes -seals required on both sides of boundary, if conduit passes within 20’ of dispenser. Refer to Table 514.3(B)(1).Little more info. We located a conduit running underground through a fuel dispensing area or gas pumps. The conduit runs across the class 1 div 1 area underground to feed a sign. WOuld a seal off be required at both ends, as it leaves store to the sign. does the class1 div extend underground?
While I believe that it would be a good idea to have seal off as well. Can below grade considered a classified area? I’m just curious - not doubting.Yes -seals required on both sides of boundary, if conduit passes within 20’ of dispenser. Refer to Table 514.3(B)(1).
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I saw this in my code book but wanted a little more clarificatiion and feed back because I read and heard somewhere that area underground are not classified but so far 514.8 says you do.