Copperweld® NM-B Cable helps teams manage cost, reduce theft-related disruptions, and support faster project completion while delivering efficient electrical performance in residential construction.
In residential and mixed-use construction, projects must balance material costs, jobsite security, and tight schedules while keeping builds on track for timely completion. Copperweld® NM-B Cable is designed to support these priorities with a bimetallic construction that helps reduce exposure to copper price volatility, minimize theft-related disruptions that can delay projects, and support faster paths to occupancy. It also delivers efficient electrical performance when sized per NEC requirements, while its lightweight, flexible construction improves handling and installation workflow across typical residential layouts.
| Equivalent Copper Size (AWG) | CCA Size (AWG) | Conductor No. of Strands | Ground Wire Size/# Strands | Insulation Thickness (in)* | Outside Dimensions (in) | Approx. Weight | CCA Allowable Amerage** | |
|---|---|---|---|---|---|---|---|---|
| PVC | Nylon | (HxW or Ø) | lb/1000 ft | 60° C | ||||
| 14/2-G | 12/2-G | Solid | 12/1 | 0.015 | 0.004 | 0.191 x 0.403 | 45.51 | 15 |
| 14/3-G | 12/3-G | Solid | 12/1 | 0.015 | 0.004 | 0.191 x 0.522 | 61.25 | 15 |
| 12/2-G | 10/2-G | Solid | 10/1 | 0.020 | 0.004 | 0.222 x 0.487 | 67.21 | 25 |
| 12/3-G | 10/3-G | Solid | 10/2 | 0.020 | 0.004 | 0.222 x 0.637 | 89.84 | 25 |
| 10/2-G | 8/2-G | 7 | 8/1 | 0.030 | 0.005 | 0.277 x 0.693 | 123.64 | 35 |
| 10/3-G | 8/3-G | 7 | 8/1 | 0.030 | 0.005 | 0.582 | 160.67 | 35 |
| 8/2-G | 6/2-G | 7 | 8/1 | 0.030 | 0.005 | 0.314 x 0.769 | 155.65 | 40 |
| 8/3-G | 6/2-G | 7 | 8/1 | 0.030 | 0.005 | 0.674 | 213.06 | 40 |
| 6/2-G | 4/2-G | 7 | 8/1 | 0.040 | 0.006 | 0.385 x 0.909 | 225.49 | 55 |
| 6/3-G | 4/2-G | 7 | 8/1 | 0.040 | 0.006 | 0.843 | 315.91 | 55 |
| 4/2-G | 3/2-G | 7 | 6/7 | 0.040 | 0.006 | 0.385 x 0.909 | 225.49 | 65 |
| 4/3-G | 3/3-G | 7 | 6/7 | 0.040 | 0.006 | 0.843 | 315.91 | 65 |
* Jacket thickness for NM-B cable is 30 mils ** Ampacity of NM-B conductors is based on NFPA 70 (NEC) Table 310.16 for a temperature rating of the conductors of 60°C according to article 340.80 (Ampacity for NM-B Cable). | ||||||||
| Part Name | Standard Jacket Color | Standard Packaging* | Standard 43x43 Pallet Qty. | Part Number** | ||||
|---|---|---|---|---|---|---|---|---|
| 12/2-G | White | 250' or 1000' | 108/12 | 12/2NMB-1/1-A-BE-WT-[Ft]-[Pkg] | ||||
| 12/3-G | White | 250' or 1000' | 81/12 | 12/3NMB-1/1-A-BE-WT-[Ft]-[Pkg] | ||||
| 10/2-G | Yellow | 250' or 1000' | 81/12 | 10/2NMB-1/1-A-BE-WT-[Ft]-[Pkg] | ||||
| 10/3-G | Yellow | 250' or 1000' | 54/12 | 10/3NMB-1/1-A-BE-WT-[Ft]-[Pkg] | ||||
| 8/2-G | Orange | 1000' | 8 | 8/2NMB-7/1-A-BE-OR-[Ft]-[Pkg] | ||||
| 8/3-G | Orange | 1000' | 8 | 8/3NMB-7/1-A-BE-OR-[Ft]-[Pkg] | ||||
| 6/2-G | Black | 1000' | 8 | 6/2NMB-7/1-A-BE-OR-[Ft]-[Pkg] | ||||
| 6/3-G | Black | 1000' | 8 | 6/3NMB-7/1-A-BE-OR-[Ft]-[Pkg] | ||||
| 4/2-G | Black | 1000' | 8 | 4/2NMB-7/1-A-BE-OR-[Ft]-[Pkg] | ||||
| 4/3-G | Black | 1000' | 8 | 4/3NMB-7/1-A-BE-OR-[Ft]-[Pkg] | ||||
| 3/2-G | Black | 1000' | 8 | 3/2NMB-7/7-A-BE-BK-[Ft]-[Pkg] | ||||
| 3/3-G | Black | 1000' | 8 | 3/3NMB-7/7-A-BE-BK-[Ft]-[Pkg] | ||||
* Other packaging options and denominations available on request. 250’ is on plastic spools [SP]; 1000’ is on wooden reels [WR]. ** Part Number Legend: [Size/# of Circuit Cond.][Type]-[# of Strands Circuit Cond. / Ground Cond.]-[A or B]-BE-[Color]-[Length in Feet]-[Packaging] • Jacket Color [Color]: White [WT], Yellow [YL], Orange [OR], and Black [BK] • Standard Packaging [Pkg]: Plastic-Wrapped Coils [PW], Plastic Spools [SP], Wooden Reels [WR] • Other packaging options and denominations available on request. 500’ is on plastic spools [SP]; 1000’ and 2500’ are on wooden reels [WR]. | ||||||||
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