NM-B (Inside)

Commonly referred to as “Romex” cable, this type of electrical wire (Non-Metallic Sheathed Cable) may be used for both exposed and concealed work in normally dry locations at temperatures not to exceed 90°C (with ampacity limited to that for 60°C conductors), as specified in by the National Electric Code (NEC).

NM-B cable is primarily used in residential wiring as branch circuits for outlets, switches, and other loads. NM-B cable may be run in air voids of masonry block or tile walls where such walls are not subject to excessive moisture or dampness.

Voltage rating for NM-B cable is 600 volts.

Type NM-B Manufacturer’s Specification Sheet.

Type NM-B Wire Composition and Sample Uses.

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  • 14/2 NM-B, Southwire
    (15 Amps)

    $11.06$60.36
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    $11.06$60.36
    Size (Feet) 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 125 150 175 200 225 250
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    $11.06$60.36
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  • 14/3 NM-B, Southwire
    (15 Amps)

    $11.79$78.74
    Clear
    $11.79$78.74
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    $11.79$78.74
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  • 12/2 NM-B, Southwire
    (20 Amps)

    $11.87$88.48
    Clear
    $11.87$88.48
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    $11.87$88.48
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  • 12/3 NM-B, Southwire
    (20 Amps)

    $13.12$114.74
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    $13.12$114.74
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    $13.12$114.74
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  • 10/2 NM-B, Southwire
    (30 Amps)

    $13.88$135.86
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    $13.88$135.86
    Size (Feet) 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 125 150 175 200 225 250
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    $13.88$135.86
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  • 10/3 NM-B, Southwire
    (30 Amps)

    $16.50$206.52
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    $16.50$206.52
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    $16.50$206.52
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  • 8/2 NM-B, Southwire
    (40 Amps)

    $20.64$234.84
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    $20.64$234.84
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    $20.64$234.84
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  • 6/2 NM-B, Southwire (55 Amps)

    $22.96$338.15
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    $22.96$338.15
    Size (Feet) 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 125 150 175 200 225 250
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    $22.96$338.15
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