Conduit Seals for Lights

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cleveland

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Midwest
We have a paint spray booth that will have a couple of ceiling mounted fluorescent lights listed for the use. Our drawings showed conduit seals when crossing into the classified area from non-class and when crossing from the Class I area into the Class 2 area. We also showed a conduit seal at each light fixture. We have been asked if these last seals, right at the lights are really needed. To be honest, I can't say. It seems to me we might not need them. Am I off base here?
 
Okay, I got out the NEC Handbook and it looks like we do not need the seals right at the light fixtures in the Class 1 Div 1 area. I'm wondering if we had a light in the Class 1 Div 2 area if we don't need one though. This is on page 679 in the 2005 handbook.
 
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