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370-23 (e) exception, (f) exception #77261
05/17/01 06:43 PM
05/17/01 06:43 PM
F
frodo  Offline OP
Member
Joined: May 2001
Posts: 129
louisville, ky usa
i hate to be a forum hog but i have a question that has come up and a few various qualified opinions on the subject would help solve the question.

here is the situation...

given a 3/4 inch run of rigid steel conduit with a 2" tee cut in. re's are used to bush the tee down to 3/4. the only support is a piece of unistrut a foot apart on either side of the tee for this example.. the rest of the run is supported correctly.

the issue is the support of the fitting...i see a code violation here because you would be using a 3/4 inch conduit to support the 2 inch tee...

given that the fitting should contain devices or fixtures you are bound by the same exception as in 370-23 (e)

i realize this has been done for a long time but.....i beleive it was changed in 1996 to eliminate this problem...

thank you for your response

2017 / 2014 NEC & Related Books and Study Guides
Re: 370-23 (e) exception, (f) exception #77262
05/17/01 08:38 PM
05/17/01 08:38 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,371
frodo;
there may be some consideration as to defining this as a 'conduit body' or 'enclosure'.

[Linked Image]

Re: 370-23 (e) exception, (f) exception #77263
05/18/01 04:46 PM
05/18/01 04:46 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,371
frodo;
maybe others can comment here, at one time an LB could be either definition. this depended on a termination within it or not. The fill calc ( seen on interior of LB's) were only to be applied to those used for terminations .

Or else we would all be using mogul LB's
(very $$$$$)

[Linked Image]

Re: 370-23 (e) exception, (f) exception #77264
05/18/01 05:47 PM
05/18/01 05:47 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
This gets a little tricky. 370-23(c) says two conduits screwed into threaded hubs are permitted to support enclosures 100 cubic inches or less without devices or fixtures in the enclosure. The exception tells us that conduit of the same trade size as the conduit body can support the conduit body even if the volume exceeds 100 cu. in.
It is now my opinion that is the volume of the 2" T is less than 100 cu. in. then the 3/4 conduits are permitted to support it.
Don(resqcapt19)


Don(resqcapt19)

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