Are seal-offs required?

[shockingdave]

I have an outdoor loadcenter on the outside wall of grain processing and storage room. when my emt enters this class 2 division 2 area, will I need seal-offs at the loadcenter for each pipe exiting the box and entering this space and going to various pieces of equipment inside of this area?

 

[rbalex]

It depends, but probably not. There are no ?boundary seals? required for Class II as there are for Class I. The key is maintaining the integrity of enclosures that are required to be dust-ignitionproof that are in the classified location. See Section 502.15, especially the second paragraph.

 

[kwired]

Duct seal is fine to use to prevent dust from entering the loadcenter. You should seal these anyway because you likely have different temperatures from inside to outside and this will help prevent condensation from forming in the raceway.