To Seal or not to Seal....???

[jscottelwood]

2005 NEC:

Here's the question: In a Class I, Division 2, Group B, C and D environment utilizing "Z" purge... which of these statements is true?

("Z" purge reduces the inside of the enclosure to unclassified)

Article 501.15(A)(2): In each conduit entry into a pressurized enclosure where the conduit is not pressurized as part of the protection system. Conduit seals shall be installed within 450mm (18") from the pressurized enclosure.

Article 501.15(B)(2)Exc.3: Conduit systems passing from an enclosure or room that is unclassified as a result of pressurization into a Class I, Division 2 location shall not require a seal at the boundary.

I really could use a "definitive" answer on this one.

Thanks,

 

[rbalex]

Both statements are true; however 501.15(A)(2) is a Division 1 application.