fittings between seal and div II boundary

Status
Not open for further replies.
W

wllthwa1

Member
I have a conduit coming from underground into the side of a Div II building.

The engineers drawing shows a seal just above the ground and then an LB into the Div II building. His classified area drawing shows the classifed area stopping at the building wall.

I question the LB fitting between the seal and the building. Ref 501.15-2 states "no fittings shall be between the seal and where the conduit leaves the boundary."

When it leaves the Div II area the LB is outside before turning underground through a seal.

Is this acceptable?
 
It is a violation of the main rule's literal text in 501.15(B)(2) and none of the Exceptions apply.

I must confess it doesn?t excite me too much since the seal is not required to be explosionproof; nevertheless, it is a violation of the current text.
 
jcross said:
Could the "LB" in question have been utilized as the "boundary seal"?
Click to expand...
While the NEC now permits then seal to be ?non-explosionproof? it still must be a seal fitting that complies with 501.15 (C) (1).
 
501.15(C) has an exception:

"Exception: Seals not required to be explosionproof by 501.15(B)(2) or 504.70."

It appears as though the seal required by 501.15(B)(2) is allowed to follow the same requirements as those required in 300.7 and 504.70????
 
jcross said:
501.15(C) has an exception:

"Exception: Seals not required to be explosionproof by 501.15(B)(2) or 504.70."

It appears as though the seal required by 501.15(B)(2) is allowed to follow the same requirements as those required in 300.7 and 504.70????
Click to expand...
Section 300.7 has an entirely different purpose (differential temperature / condensation). Since we don?t seem to be talking about intrinsically safe wiring, Section 504.7 doesn?t apply either; but the exception?s reference to 501.15(B) (2) does apply.

Section 501.15(B)(2) still requires ?Such seals ?shall be identified for the purpose of minimizing passage of gases under normal operating conditions?? I realize identify does not necessarily mean listed or labeled; nevertheless, how would you propose to ?identify? it?
 
Article 100 definition: Identified (as applied to equipment). Recognizable as suitable for the specific purpose, function, use, environment, application, and so forth, where described in a particular Code requirement.

We here at our site have come to the agreement that a standard conduit fitting,(C, LB, etc) properly packed with "duxseal" would meet the intent as identified for the purpose of 501.15.(B)(2).
 
Status
Not open for further replies.
Top