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Old 12-02-2009, 11:54 AM   #1
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NEC Junction Box Conductor FIll: A Single Splice is counted as Two Conductors?


I'm finding my own interpretation of the terminology unclear, from the NEC:

"Each conductor that originates outside the box and terminates within the box shall be counted once, and each conductor that passes through the box without splice or termination shall be counted once."


So for example: one 12 gage conductor enters the junction box, is spliced to one other 12 gage conductor which then exits the junction box...this is counted as ONE or TWO conductors in determining the Conductor FIll?

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Old 12-02-2009, 12:02 PM   #2
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NEC Junction Box Conductor FIll: A Single Splice is counted as Two Conductors?


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Originally Posted by Lovegasoline View Post
I'm finding my own interpretation of the terminology unclear, from the NEC:

"Each conductor that originates outside the box and terminates within the box shall be counted once, and each conductor that passes through the box without splice or termination shall be counted once."


So for example: one 12 gage conductor enters the junction box, is spliced to one other 12 gage conductor which then exits the junction box...this is counted as ONE or TWO conductors in determining the Conductor FIll?
Counts as TWO

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Old 12-02-2009, 12:06 PM   #3
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NEC Junction Box Conductor FIll: A Single Splice is counted as Two Conductors?


If it is spliced then that ends "that" conductor & the spliced conductor is another wire
Each spliced conductor counts as one
Say you have a conductor that enters the box in conduit & continues on - unspliced
That counts as one
Now you cut it & splice it to another conductor going into a new conduit
Now the original wire counts as 2, the new one counts as one

Does that make sense ?
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Old 12-02-2009, 12:11 PM   #4
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NEC Junction Box Conductor FIll: A Single Splice is counted as Two Conductors?


I'm finding my own interpretation of the terminology unclear, from the NEC:

With all due respect sir: You have now joined a very long line of people.
Thankfully, there are those such as "Scuba_Dave" and "HouseHelper" out there to help us all. Thanks, David
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Old 12-02-2009, 12:22 PM   #5
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NEC Junction Box Conductor FIll: A Single Splice is counted as Two Conductors?


Thanks for the answers. Yes, now it's clear.
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Old 12-02-2009, 01:08 PM   #6
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NEC Junction Box Conductor FIll: A Single Splice is counted as Two Conductors?


Good afternoon (my time) guys.....


Stubbie is sitting here waiting on the concrete truck to start a pour on a new driveway addition. The Flat Work guys were supposed to be here over a month ago... finally got here yesterday and got the area ready. Seems like this is the norm around here with concrete contractors....
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Old 12-02-2009, 11:39 PM   #7
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NEC Junction Box Conductor FIll: A Single Splice is counted as Two Conductors?


An informative illustration, thanks.

[Not too many illustrations ...are there even any(?)... in the NEC Code book I have. It's not a bad idea...].


Btw, in the illustration above let's assume the cable is all BX.
For conductors #5 & #6 which pass through the box: barring any special tools, what's the easiest way to cut away the BX to expose the conductors without damaging the wires? Do you twist the cable and/or twist and bend it until the armor unlinks from itself and then snip in one place and start unraveling it?



And yes Thurman, many thanks to contributors on the forum for the sharing of knowledge.

Last edited by Lovegasoline; 12-02-2009 at 11:49 PM.
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Old 12-02-2009, 11:44 PM   #8
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NEC Junction Box Conductor FIll: A Single Splice is counted as Two Conductors?


There is an NEC handbook that has illustrations
Not sure it has ones as good as Stubbies

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