Class 1 Div 2 fiber glass paint booth Question

[searlest]

We have a upcoming project that is listed on the prints as a Class 1 Div 2 environment ......

My understanding of the code is

1) I need a seal off within the first 18 inches of conduit from the device

and

2) A seal off directly after I exit the Class 1 div 2 environment...

My question is if I have a devise located on the wall off the booth can I pass directly thru the booth wall and install a seal off and only use one?

Thanks in advance

 

[xformer]

We have a upcoming project that is listed on the prints as a Class 1 Div 2 environment ......

My understanding of the code is

1) I need a seal off within the first 18 inches of conduit from the device

and

2) A seal off directly after I exit the Class 1 div 2 environment...

My question is if I have a devise located on the wall off the booth can I pass directly thru the booth wall and install a seal off and only use one?

Thanks in advance

IMHO... no... the purpose of the seal is to isolate the atmosphere within the conduit before you get to the device....

 

[nhee2]

Note the device would require a seal within 18" only if the conduit is entering an enclosure required to be explosionproof.

I would think a single seal fitting would be acceptable provided the seal was within 18" of the device, was within 10 ft of the Cl I Div 2 boundary, and there were no other fittings between the seal and the boundary, per 501.15(B)(2).

 

[rbalex]

My first question would be how the interior of the booth was only classified Division 2. [Sections 516.3(B)(1) and 516.3(C)(4)]