What can I run on 6/3 NM-B?

It suits 240-volt residential loads such as ranges, dryers, subpanels and EV chargers. The 55-amp allowable ampacity covers circuits up to that rating.

Is this the same as Romex?

It is described as equivalent to Romex NM-B and meets the same UL 719 and NEC requirements. The construction is three PVC/nylon-insulated conductors plus a bare copper ground under a PVC sheath.

Can it be used outdoors or in a garage?

No. NM-B is for normally dry indoor installations. It is not for wet or damp locations, though it may be fished through masonry or tile walls where not exposed to moisture.

Why is it rated 55 amps if the insulation is 90°C?

The conductor insulation is rated 90°C, but the 2008 and 2011 NEC limit NM-B ampacity to the 60°C column. Use the 55-amp figure for sizing the breaker and load.

What is in the 20-foot cut?

One 20-foot length of 6/3 NM-B cable with a bare 10 AWG ground. It ships as a cut length, not on a spool or in a box.

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6/3 NM-B Non-Metallic Sheathed Cable Residential Indoor Wire (20Ft Cut)

Best price now

$96.18at WalmartChecked Nov 9

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6/3 NM-B Non-Metallic Sheathed Cable Residential Indoor Wire (20Ft Cut)

Best price now

$96.18at WalmartChecked Nov 9

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $96.18 at Walmart on Nov 9.

Our take on the 6/3 NM-B Non-Metallic Sheathed Cable Residential Indoor Wire (20Ft Cut)

This is a 20-foot cut of 6/3 NM-B non-metallic sheathed cable: three 6 AWG conductors plus a 10 AWG bare ground, rated 600 volts and 55 amps. It is the heavy-gauge branch cable used for ranges, dryers, subpanels and EV chargers, and it is lead-free and RoHS compliant. The sheath is rated 90°C, but ampacity must be taken at the 60°C column under the 2008 and 2011 NEC, which is why the 55-amp figure applies. Against boxed Romex, a cut length means less waste on short runs, but you get no spool or box and no brand-name track record.

Best forWiring a range, dryer or subpanelEV charger branch circuitsResidential indoor dry locationsShort runs where a full coil is wasteful

Pros

Three 6 AWG conductors plus 10 AWG ground
55-amp allowable ampacity
600-volt rating, 90°C insulation
Lead-free and RoHS compliant
Meets UL 83, UL 719 and A-A-59544

Cons

Ampacity limited to the 60°C column
Cut length arrives without a spool or box
Not for wet or damp locations
Stiff 6 AWG is hard to bend in tight boxes

6/3 NM-B Non-Metallic Sheathed Cable Residential Indoor Wire (20Ft Cut) prices at every store

WalmartNew
In stockSold by Zuljin Grocery StoreReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$96.18Free shippingChecked Nov 9
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About the 6/3 NM-B Non-Metallic Sheathed Cable Residential Indoor Wire (20Ft Cut)

This is 6/3 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. It is equivalent to Romex NM-B.

Each conductor is insulated with color-coded PVC and a nylon covering that meets the required thickness of Type THHN. The ground is soft, bare copper. A 30 mil color-coded PVC sheath rated 90°C covers the finished assembly.

The cable is rated at 600 volts. Its conductors are rated 90°C dry, but ampacity is limited to 60°C. It may be fished through masonry or tile walls where it is not exposed or subject to excessive moisture or dampness. It is lead and RoHS compliant.

Length: 20 ft cut
Color: Black
Wire size: 6 AWG
Conductors: 3
Ground wire: 10 AWG, soft bare copper
Voltage rating: 600 volts
Ampacity: 55 amps allowable
Conductor temp: 90°C rated; ampacity limited to 60°C
Insulation: Color-coded PVC, 0.76 mm / 0.029 in thick
Nylon covering: 0.13 mm / 0.005 in thick
Sheath: 30 mil color-coded PVC, rated 90°C
Cable diameter: 16.0 mm / 0.62 in nominal
Weight: 0.357 lbs per foot
Use: Residential indoor wiring in normally dry locations
Standards: UL 83, UL 719, Federal Specification A-A-59544, NEC requirements
Compliance: Lead and RoHS compliant

Specifications

size: 20Ft CutSource
color: BlackSource

Questions and answers

What can I run on 6/3 NM-B?: It suits 240-volt residential loads such as ranges, dryers, subpanels and EV chargers. The 55-amp allowable ampacity covers circuits up to that rating.
Is this the same as Romex?: It is described as equivalent to Romex NM-B and meets the same UL 719 and NEC requirements. The construction is three PVC/nylon-insulated conductors plus a bare copper ground under a PVC sheath.
Can it be used outdoors or in a garage?: No. NM-B is for normally dry indoor installations. It is not for wet or damp locations, though it may be fished through masonry or tile walls where not exposed to moisture.
Why is it rated 55 amps if the insulation is 90°C?: The conductor insulation is rated 90°C, but the 2008 and 2011 NEC limit NM-B ampacity to the 60°C column. Use the 55-amp figure for sizing the breaker and load.
What is in the 20-foot cut?: One 20-foot length of 6/3 NM-B cable with a bare 10 AWG ground. It ships as a cut length, not on a spool or in a box.
Where is the 6/3 NM-B Non-Metallic Sheathed Cable Residential Indoor Wire (20Ft Cut) cheapest?: At Walmart, for $96.18, as of our latest check.