The largest solid conductor allowed in a raceway is 10 AWG

[AngellottiPierson]

The largest solid conductor allowed in a raceway is 10 AWG. What is the NEC code that covers this in the 2014 code book?

 

[david luchini]

310.106(C)

 

[AngellottiPierson]

Thank you!! When I look at the 2014 code book, this section does not specify 8 or 10. I looked online, and the answer is seemingly 10 AWG. Is there another section that specifies the largest solid copper conductor allowed in a raceway?

 

[david luchini]

Thank you!! When I look at the 2014 code book, this section does not specify 8 or 10. I looked online, and the answer is seemingly 10 AWG. Is there another section that specifies the largest solid copper conductor allowed in a raceway?

I don't have a hardcopy, so I'm looking online. 310.106(C) specifically mentions #8AWG.

 

[roger]

Thank you!! When I look at the 2014 code book, this section does not specify 8 or 10.

(C) Stranded Conductors. Where installed in raceways, conductors
8 AWG and larger, not specifically permitted or required
elsewhere in this Code to be solid, shall be stranded.

That pretty much sums it up, #10 would be the limit for solid.

Roger

 

[tortuga]

Prior to the 1971 Code it was 6 Awg and larger had to be stranded.
I encounter this often in old house range circuits pulled in pipe.
The change to 8 AWG and larger was written in 310-9 of the '71 code to be effective 1/1/73
Grounding and bonding conductors are the only exception I know of that can be solid in 8 AWG and any size; 250.62, 250.118
I am not sure if they even make solid #8 THWN/THHN for other applications.

 

[tom baker]

I worked in a building that was owned by the POCO, before it was sold. Some of the wiring in conduit was 8 AWG insulated solid. Hard to pull out

 

[fmorello]

Agree... the ONLY place I know to install solid #8awg in a raceway is:
68023(B)(2)(b)Nonmetallic Conduit. Where a nonmetallic conduit is used, an 8 AWG insulated solid or stranded copper bonding jumper shall be installed in this conduit unless a listed low-voltage lighting system not requiring grounding is used. The bonding jumper shall be terminated in the forming shell, junction box or transformer enclosure, or ground-fault circuit-interrupter enclosure. The termination of the 8 AWG bonding jumper in the forming shell shall be covered with, or encapsulated in, a listed potting compound to protect the connection from the possible deteriorating effect of pool water.


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