Splicing In A Condulet

[ed downey]

I Have A Question About Splicing In A Condulet And The Size Of Condulet Required. I Have An Electrical Contractor That Has Installed A "T" Condulet (12.50 CU In) And Has Pulled (3) #6 THHN Phase Conductors & (3) #10 THHN Phase Conductors With A #10 THHN Equipment Ground Conductor. THe #10 Equipment Ground Has Been Spliced In The Condulet And Then Run To Each Piece Of Equipment. My Question Deals With 1999 NEC 370-16(c) And Table 370-16(b).
The Way I Read It Is If You Pull Straight Through The Condulet Then You Use The Information In Table 1 Of Chapter 9 For Conduit Fill. But If You Make A Splice You Need To Use Table 370-16(b). If This IS Correct How Do You Use This Table?
{ie 3-#6 Equals 15.0 Cu IN So I am Over The 12.5 Cu In Capacity And Therefore It Is Not Allowed}

Thanks For Any Help On THis Matter.

Ed

 

[ryan_618]

Re: Splicing In A Condulet

The way I read it is that once you splice in a conduit body, you are forced to use 370-16(b), this is as per 370-16(c)(2). With that in mind, each #6 and each #10 is to be counted once, and your equipment ground is to be counted once. I come up with (15) for 3 #6's+ (10)for 4 #10, total of 25 inches. I agree with you, they are not in compliance. Hope this helps.

 

[safari49]

Re: Splicing In A Condulet

This question has risen in our area and we found that the manufacturers have on their web sites charts giving the volumes and charts for number of conductors. this can maybe be helpful.

tom