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NM-B 10/3 Copper with Ground Non-Metallic Sheathed Branch Circuit Cable, 500ft Reel

NM-B 10/3 Copper with Ground Non-Metallic Sheathed Branch Circuit Cable, 500ft Reel

Last price we saw

$1,441.02at Echo Electric, last seen Nov 1

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Our take on the NM-B 10/3 Copper with Ground Non-Metallic Sheathed Branch Circuit Cable, 500ft Reel

This is 500 feet of NM-B 10/3 copper cable with ground, sold on a reel. NM-B is the standard sheathed cable for dry indoor branch circuits; 10-gauge copper with three insulated conductors plus ground is what 30-amp circuits call for, such as an electric dryer, a water heater, or a 30-amp subpanel feed. It is not rated for wet locations or for direct burial, and it must be protected where it runs exposed. The latest best price sits at the low end of its recent range, so this is a reasonable time to buy if the run length fits your job.

Best for30-amp dryer, water heater or subpanel runs
Indoor branch circuits in dry, protected spaces
Electricians buying a full 500 ft reel for a job
Homeowners wiring a single 30-amp appliance
Pros
  • 10-gauge copper carries 30 amps, the standard for dryers and water heaters
  • Three insulated conductors plus ground cover 240V appliance circuits
  • 500 ft reel cuts waste on long or multi-run jobs
  • NM-B sheath is familiar to inspectors and easy to strip
  • Widely stocked, so price comparison across stores pays off
Cons
  • Not for wet locations, outdoors or direct burial
  • Must be protected from physical damage where exposed
  • Stiffer and harder to pull than 12/2 or 14/2
  • 500 ft is more than a single appliance run usually needs
  • Copper price swings make the reel costly

NM-B 10/3 Copper with Ground Non-Metallic Sheathed Branch Circuit Cable, 500ft Reel prices at every store

  • Echo ElectricCheck price at Echo Electric

NM-B 10/3 Copper with Ground Non-Metallic Sheathed Branch Circuit Cable, 500ft Reel price history

Lowest price we've seen: $1,441.02 on Nov 1 at Echo Electric. Tracked across 1 store since Nov 1.

What reviewers say

Buyers of NM-B 10/3 generally report clean, consistent copper and a sheath that strips without fighting them. Complaints center on stiffness in cold weather and reels arriving with kinks or a loose wrap.

Pros
  • Copper conductors are true 10-gauge and easy to terminate
  • Sheath strips cleanly and prints legible markings
  • Reel feeds smoothly on long pulls
Cons
  • Stiff to pull in cold weather
  • Occasional kinks or loose wrapping on the reel
  • Heavy and awkward to carry alone

Specifications

Conductor Size
#10
Number Of Conductors
3
Cable Type
NM-B
Grounding
With Ground
Spool Length
500ft

Questions and answers

Is 10/3 NM-B the right cable for a dryer?
Yes for most electric dryers. A 30-amp, 240-volt dryer circuit needs 10-gauge copper with two hots, a neutral and a ground, which is exactly what 10/3 NM-B provides. Check the dryer's nameplate and local code before you buy.
Can this cable be buried or run outdoors?
No. NM-B is rated for dry, indoor locations only. For underground runs use UF cable or conduit, and for wet outdoor spots use a wiring method rated for wet locations.
How many amps does 10/3 copper carry?
The 60°C column of the code tables rates 10-gauge copper at 30 amps, which is the usual breaker size for this cable. Derating for bundling or high ambient temperature can lower that.
What is the difference between 10/2 and 10/3?
10/2 has two insulated conductors plus ground; 10/3 has three plus ground. You need 10/3 when the circuit requires a neutral, such as a dryer or a 120/240V subpanel feed.
Is a 500 ft reel worth it over buying by the foot?
Only if your total run plus waste is long or you have several circuits to wire. For one short appliance run, buying a shorter length usually costs less.
When is this cable cheapest?
Copper cable prices track the copper market, so they move with commodity swings rather than seasons. Compare the per-foot price across stores and buy when the reel price is near the low end of its recent range.