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12/3 NM-B, Non-Mettalic, Sheathed Cable, Residential Indoor Wire Cut To Order

12/3 NM-B, Non-Mettalic, Sheathed Cable, Residential Indoor Wire Cut To Order

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$1.14at WirencoChecked Nov 9

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Price facts

  • Last seen at $1.14 at Wirenco on Nov 9.

Our take on the 12/3 NM-B, Non-Mettalic, Sheathed Cable, Residential Indoor Wire Cut To Order

This is 12-gauge, three-conductor NM-B cable with a bare ground, sold by the foot and cut to the length you order. It is the standard branch-circuit cable for dry indoor residential wiring: outlets, lights and other household loads. The PVC jacket with nylon-covered conductors is rated 600 volts and 90°C dry, but code limits its ampacity to the 60°C column. Against 12/2, it adds a second insulated conductor for circuits that need a neutral plus a traveler or a switched leg, such as three-way switches and multiwire circuits. It is not for wet locations, outdoor runs or exposed work where physical damage is possible.

Best forIndoor branch circuits on 20-amp breakersThree-way switch and multiwire circuit runsDIYers wiring a house or addition to codeSmall jobs where you want an exact cut length
Pros
  • Three insulated conductors plus ground in one jacket
  • 12 AWG copper handles 20-amp circuits
  • Color-coded conductors simplify identification
  • Nylon-covered PVC insulation rated 90°C dry
  • Meets UL 83, UL 719 and ASTM specs
  • Lead free and RoHS compliant
Cons
  • Ampacity limited to the 60°C column by code
  • Not for wet, damp or exposed locations
  • Stiffer and harder to pull than 14/2
  • Cut-to-order lengths can't be returned once cut

12/3 NM-B, Non-Mettalic, Sheathed Cable, Residential Indoor Wire Cut To Order prices at every store

  • WirencoNew

    In stockReturn policy

    $1.14Checked Nov 9
    Visit Wirenco

About the 12/3 NM-B, Non-Mettalic, Sheathed Cable, Residential Indoor Wire Cut To Order

This is 12/3 NM-B non-metallic sheathed cable for residential indoor wiring. It is used in normally dry installations as branch circuits for outlets, lighting and other residential loads. Its applications are outlined in NEC 2008 and NEC 2011 Article 334.

Each conductor has color-coded PVC insulation with a nylon covering, meeting the required thickness of Type THHN. A 30 mil color-coded PVC sheath is applied over the completed assembly. Both the conductor insulation and the sheath are rated 90°C.

The cable is rated at 600 volts. It is rated at a conductor temperature of 90°C dry, but its ampacity is limited to 60°C under NEC 2008 and NEC 2011. It may be fished through masonry or tile walls where it is not exposed or subject to excessive moisture or dampness. The cable is lead free and RoHS compliant.

Type
NM-B non-metallic sheathed cable
Conductor size
#12 AWG
Conductors
3
Ground wire
12 AWG
Voltage rating
600 volts
Ampacity
20 Amps allowable
Temperature rating
90°C conductor and sheath; ampacity limited to 60°C per NEC 2008 and 2011
Insulation
Color-coded PVC with nylon covering, Type THHN thickness
Insulation thickness
PVC 0.38 mm / 0.37 inches; nylon 0.100 mm / 0.004 inches
Sheath
30 mil color-coded PVC
Cable dimensions
Nominal 8.6 mm x 0.37 inches
Weight
0.107 lbs per foot
Standards
UL 83, UL 719, Federal Specification A-A-59544, NEC requirements; meets or exceeds applicable ASTM specifications
Compliance
Lead free, RoHS compliant
Use
Indoor residential, normally dry locations

Questions and answers

What is 12/3 NM-B cable used for?
Dry indoor branch circuits that need three insulated conductors plus ground, such as three-way switches, multiwire circuits and some 240-volt loads. It is not rated for wet or exposed locations.
How much current can 12/3 NM-B carry?
The conductors are 12 AWG and the cable is rated 600 volts. Under the NEC its ampacity is limited to the 60°C column, which is 20 amps for 12 AWG copper.
What is the difference between 12/2 and 12/3 NM-B?
12/2 has two insulated conductors plus a bare ground. 12/3 adds a third insulated conductor, which you need for three-way switching, multiwire circuits or a 240-volt circuit with a neutral.
Can it be used outdoors or buried?
No. NM-B is for normally dry indoor installations. It is not rated for wet locations, direct burial or exposed work subject to damage.
How is the cable cut and sold?
It is cut to the length you order rather than sold in fixed coils, so measure the run and add slack for routing and terminations.
Where is the 12/3 NM-B, Non-Mettalic, Sheathed Cable, Residential Indoor Wire Cut To Order cheapest?
At Wirenco, for $1.14, as of our latest check.

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