Class 1 div 1

[101010]

I know a boundry seal has to be within 12" inside or outside of the classified area. If the seal is on the outside you cannot have an Lb outside before the seal right?

 

[nollij]

Article 501.15(A)(4) states:

"In each conduit run leaving a Class I, Division 1 location. The sealing fitting shall be permitted on either side of the boundary of such location within 3.05m (10ft) of the boundary and shall be designed and installed so as to minimize the amount of gas or vapor within the Division 1 portion of the conduit from being communicated to the conduit beyond the seal. Except for listed explosionproof reducers at the conduit seal, there shall be no union, coupling, box, or fitting between the conduit seal and the point at which the conduit leaves the Dicision 1 location."

So, to answer your question, you are correct. The LB fitting is not permitted to be between the Division 1 boundary and the conduit seal. Also, it is 10 feet, not 12".

 

[JHouston]

Sorry to resurrect a dead thread, but you can always use a threaded "GR type" Class I Div I rated enclosure before the seal if you need to make a bend. Just be careful around Group B though, also no Group A rating.

Something like this : http://www.emersonindustrial.com/en.../gr-grf-conduit-outlet-box/Pages/default.aspx


PS 1st post!!:thumbsup:

 

[rbalex]

Sorry to resurrect a dead thread, but you can always use a threaded "GR type" Class I Div I rated enclosure before the seal if you need to make a bend. Just be careful around Group B though, also no Group A rating.

Something like this : http://www.emersonindustrial.com/en.../gr-grf-conduit-outlet-box/Pages/default.aspx


PS 1st post!!:thumbsup:

Fundamentally, nothing is permitted between between a Division 1 boundary seal and the boundary itself-threaded, explosionproof or not; the lone exception is a reducer at the seal itself. See 501.15(A)(4)