Purged enclosure sealing in CL I Div 2

[HazLocCdn]

I'm a Canadian familiarizing myself with NEC.

Currently working on a project that will be installed in a Class I Div 2 area. I have an large enclosure I'll be entering with cable and conduit from a Class I Div 2 area exterior to the enclosure, whereas the enclosure itself will be purged to allow a GP area class. Reading through 501.15 2 Pressurized Enclosures, am I correct in interpreting that I will need conduit seals packed and poured (ie: crouse EYS type) for rigid conduit, and sealed cable glands (ie: T&B STX) for MC-HL?

If this is my correct interpretation, will the seals be required to be installed on the exterior of enclosure in the Div 2 area? or would they be permitted to be install just on the inside wall of the purged enclosure?

Any guidance would be greatly appreciated!

 

[HazLocCdn]

Solved! Should have read further. 501.15 (B) (2) exception No.3

conduit passing from an enclosure or room permitted to use GP equipment as a result of pressurization into a Div 2 location shall not require a seal at the boundary

 

[petersonra]

Solved! Should have read further. 501.15 (B) (2) exception No.3

conduit passing from an enclosure or room permitted to use GP equipment as a result of pressurization into a Div 2 location shall not require a seal at the boundary

Not required does not mean not desirable. Air leaks are expensive.

 

[HazLocCdn]

Good point. I'm intending on maintaining the pressure in the enclosure with duct seal.