Qty Wire In Tubing

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Alwayslearningelec

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Say you had multiple receptacles located long a wall and combined it was 6(1P-20A) circuits and you had to run EMT through the studs from/to each receptacle.
Assuming separate neutrals what would be the most #12's you you put in a 3/4" pipe?

What I come up with is:
#12 @ 75 degree is rated for 25A.
4-6 CCC's in a conduit would need to be derated and only good for 80%. Thus 4-6 CCC's(neutral counted as CCC) would be good for 20A after derating.
So 6 #12 CCC's in a 3/4" conduit is the max, correct?
 
ActionDave said:
Since all wire these days has 90⁰c insulation you can derate from there which will allow you to get 9 12 AWG current carrying conductors in a pipe with a 20A circuits. With dedicated neutrals that would mean four circuits.
Click to expand...
Oh right I forgot about that...when derating use the 90 degree column.
So then my question is would you( or any others) run 9 # 12's through a common 3/4" EMT feeding receptacles along a wall.?
 
Ok, thanks all. I thought it would create problems pulling 9+ conductors through a box that has splices for the receptacles. MAybe a 4-11/16" box would help.
 
You're allowed 18-#12 in a 4 11/16 deep box plus the raised cover volume if applicable. Since you can't use more than 4 circuits in the single raceway due to derating the box size won't be an issue.
 
infinity said:
You're allowed 18-#12 in a 4 11/16 deep box plus the raised cover volume if applicable. Since you can't use more than 4 circuits in the single raceway due to derating the box size won't be an issue.
Click to expand...
If I remember correctly you're allowed 13 #12's in a 4 " square X 2 1/8.
 
Alwayslearningelec said:
Ok, thanks all. I thought it would create problems pulling 9+ conductors through a box that has splices for the receptacles. MAybe a 4-11/16" box would help.
Click to expand...
If you are pulling through the box with no splice that only counts as one conductor for box fill, any wires that are spliced count one for entering the box and one for each wire that leaves the box. Green wires up to four combine to equal one, every green after four counts as .25
You also get to include the depth of your mud ring as extra cubic inches.
 
ActionDave said:
If you are pulling through the box with no splice that only counts as one conductor for box fill, any wires that are spliced count one for entering the box and one for each wire that leaves the box. Green wires up to four combine to equal one, every green after four counts as .25
You also get to include the depth of your mud ring as extra cubic inches.
Click to expand...
Wow...ok thanks.
So if your pulling 4 wires through a 4" box with NO splice is counts as 1 wire toward box fil?
 
ActionDave said:
If you are pulling through the box with no splice that only counts as one conductor for box fill, any wires that are spliced count one for entering the box and one for each wire that leaves the box. Green wires up to four combine to equal one, every green after four counts as .25
You also get to include the depth of your mud ring as extra cubic inches.
Click to expand...
Would a hot and neutral in connected to a receptacle with a hot and neutral out (no splices just connected to the receptacle) count as two conductors or four?
 
Alwayslearningelec said:
Say you had multiple receptacles located long a wall and combined it was 6(1P-20A) circuits and you had to run EMT through the studs from/to each receptacle.
Assuming separate neutrals what would be the most #12's you you put in a 3/4" pipe?

What I come up with is:
#12 @ 75 degree is rated for 25A.
4-6 CCC's in a conduit would need to be derated and only good for 80%. Thus 4-6 CCC's(neutral counted as CCC) would be good for 20A after derating.
So 6 #12 CCC's in a 3/4" conduit is the max, correct?
Click to expand...
Wouldn't six circuits with individual neutrals require 12 conductors? :unsure:
 
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