conduits in interior walls within a class 1 div2 loccation.

[lfloyd]

What actually defines the limits of a classified location?
Are self closing casketed doors required to separate classified form nonclassified? Sealed or tightly constructed walls?
Is the interior cavity of a wall within the classified location nonclassified?
Can PVC conduits enter interior walls from the slab in a classified location without seals?
It seems like a lot of effort goes into protecting and sealing wiring in classified locations but not much is required to separate classified from unclassified areas.

 

[rbalex]

Hazardous locations in general and electrical area classification in particular are prime examples of 90.1(C).

What actually defines the limits of a classified location?
...

As stated in Section 500.4(B) Reference Standards, IN (or FPN) 1 through 5, and depending on the applications involved, you would do well to become familiar with NFPA 497 and ANSI/API RP500 as a minimum.

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Are self closing casketed doors required to separate classified form nonclassified?
?

No.

?
Sealed or tightly constructed walls?
...

Not usually between Division 2 and unclassified, unless there is a significant pressure differential from on the Division 2 side. [See 500.15 IN (or FPN) 1&2 and cross reference to 501.15(C)(2)]

?
Is the interior cavity of a wall within the classified location nonclassified?
...

Usually, the wall creates a boundary.

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Can PVC conduits enter interior walls from the slab in a classified location without seals?
...

No. A boundary seal is necessary, but depending on the actual installation, a single boundary seal may only be necessary and a transition to PVC in the interior may be suitable.

?
It seems like a lot of effort goes into protecting and sealing wiring in classified locations but not much is required to separate classified from unclassified areas.

Yes, that?s why Section 90.1(C) is relevant.