How to Run a New Range Circuit From the Panel

Why this matters

A range circuit is the one place where the nameplate number and the right breaker are deliberately different. A 12 kW range draws 50 A if every element, the oven and the broiler ran flat out at once, which no cook does, and the NEC lets you size the branch circuit to the demand instead. Crews who skip the table run 6 AWG on a 50 A breaker for every range and spend copper and wall space they did not need; crews who misread the table land a big range on a circuit below the code's floor. The other half of the job is mechanical and gets less attention than it deserves: the receptacle has to sit where the range can push back far enough for its anti-tip bracket to engage, because a range that tips onto a child standing on the open oven door is how this appliance kills people.

Citations are NEC 2023 (2020 where the section moved), as adopted, local amendments checked; permits and inspections per the AHJ. Copper conductors throughout.

The sizing sheet, filled in for a 12 kW range

The house is converting from gas to electric cooking. The new freestanding range's nameplate, on the frame behind the storage drawer, reads 12.0 kW at 240 V. The panel is in the attached garage, 38 ft of cable route from the range location. Reading an Appliance Nameplate for Circuit Sizing owns how to find and convert the rating; the sheet below is what the ticket carries.

 RANGE CIRCUIT SIZING, ONE HOUSEHOLD RANGE
 Nameplate ................ 12.0 kW at 240 V
 Nameplate current ........ 12,000 / 240 = 50.0 A
 Table 220.55, Col C,
   1 range, not over 12 kW ............... 8 kW
 Demand current ........... 8,000 / 240 = 33.3 A
 Floor for a range of 8-3/4 kW
   or more, 210.19 range rule ........... 40 A
 Circuit rating ............................ 40 A
 Breaker ......................... 40 A 2-pole
 Conductors ...... 8 AWG Cu NM, 60 C col: 40 A
 Neutral ................ 8 AWG, in the cable
 Ground ................ 10 AWG, in the cable
 Receptacle ........ 14-50 (40 or 50 A allowed
                     on 40 A, Table 210.21(B)(3))
 Box fill: 3 x 3.00 + 1 x 2.50 + 2 x 3.00
         = 17.5 cu in, in a 30.3 cu in box

Why each line is what it is.

• The demand. Note 4 to Table 220.55 permits the branch-circuit load for one range to be taken from the table. Column C gives 8 kW for one range not over 12 kW. At 240 V that is 33.3 A, and back the other way, 33.3 A times 240 V is 8,000 W, so the division closes.
• The floor. 210.19's household-range rule ((A)(3) in the 2020 edition; numbering moved in 2023, so check the current edition) sets a minimum 40 A branch-circuit rating for a range rated 8-3/4 kW or more. 33.3 A would round up to 35 A on the next breaker size, and the floor overrides it. This is the line that catches crews who size by demand alone.
• The conductors. NM is sized from the 60 C column under 334.80. 8 AWG copper is 40 A there, which matches the 40 A breaker exactly.
• The ground. 8/3 NM carries a 10 AWG grounding conductor, which is what Table 250.122 requires for a 40 A circuit.
• The receptacle. A 40 A circuit may serve a 40 A or 50 A receptacle under Table 210.21(B)(3). The 14-50 is the four-wire range face nearly every range cord kit is made for.
• The box fill. Under 314.16, three insulated 8 AWG at 3.00 cu in each is 9.00; all grounding conductors count once at the largest, 10 AWG, 2.50; the receptacle yoke counts two of the largest conductor on it, 8 AWG, 6.00. 9.00 plus 2.50 plus 6.00 is 17.5 cu in. A 4 in square box 2-1/8 in deep is 30.3 cu in, before its mud ring, and passes with room for a clamp allowance.

Read the installation instructions before you accept the sheet. Some ranges call for a 50 A circuit in their instructions regardless of the table, and 110.3(B) makes those instructions part of the installation. Then the conductors become 6 AWG copper NM (55 A in the 60 C column) on a 50 A breaker, and the sheet changes from the circuit line down.

Steps

1. Confirm the service can carry it. A gas-to-electric conversion adds the range's Table 220.55 demand to the dwelling calculation, and on a 100 A service with an electric water heater and central air that can be the line that does not close. Standard Method General Load Pieces for a Dwelling owns how the range enters that calculation. Find out before the range is delivered, not after.

2. Mark the receptacle where the range wants it. The range's installation instructions show a zone on the wall or floor behind the range where the receptacle and the cord must sit so the range pushes back flush. Outside that zone the plug fouls the range's back, the range stands an inch or two proud, and the anti-tip bracket at the rear foot never engages. Mark the box inside the zone, and locate the anti-tip bracket position on the floor or wall from the same template before you set the box, so they do not collide.

3. Run the cable. 8/3 NM with ground, from the panel to the box, supported, bored and plated as NM Cable Support, Protection, and Clearance Rules describes. In this house the route runs along the garage ceiling and through the kitchen floor from the basement. Where 8/3 bends into a box, its stiffness pulls on the box; use a box mounted to framing, not an old-work box with flip ears.

4. Set the box and receptacle. Flush 14-50 in the 4 in square box with a single-device ring, or a listed surface-mount 14-50 low on the wall inside the zone. X and Y the hots (black and red), W the neutral (white), G the grounding conductor; NEMA Receptacle Faces for 240 Volt and RV Circuits has the face if the device's markings are hard to read. Torque to the device's marked value with a calibrated tool per 110.14(D); a range pulls tens of amps for an hour, and a loose 8 AWG terminal on a range receptacle is a common origin of a burned plug.

5. Land the breaker with the panel dead. Main off, locked and tagged, and the bus proved dead with a CAT III or better meter checked on a known live source before and after, per NFPA 70E Article 120 (120.5 in the 2021 edition, renumbered in 2024), with work practices at 29 CFR 1910.333(b)(2). The service conductors and the main's line terminals stay energized until the utility pulls the meter; keep tools off them and wear the PPE your 70E risk assessment calls for. Black and red on the 2-pole breaker, white on the neutral bar, bare on the ground bar, each torqued to its marked value. Write the directory entry: "Range, kitchen, 40 A".

6. Restore and test the receptacle before the range arrives. Cover on, lock off, stand to the side of the panel, main on, then the range breaker. Run the finish test below at the empty receptacle.

7. Connect the range. A new range ships without a cord on most models. The four-wire 50 A range cord kit goes on the range's terminal block per its instructions, and in four-wire configuration the neutral-to-frame bonding strap comes off, because the frame now has its own grounding conductor. Whoever does this step, the appliance installer or you, the ticket says who. How to Change a Dryer or Range Cord from Three-Wire to Four-Wire covers the cord side.

8. Set the range and engage the anti-tip bracket. Two people move it; a range is heavy enough to injure a back and gouge a floor. Plug in, push the range back over the bracket, and confirm engagement the way the range's instructions describe, typically by grasping the back edge and tipping gently forward: the range should not lift. The bracket stays installed every time the range is pulled out for service. Leaving it off because the receptacle sits in the wrong place is the failure step 2 prevents.

A hardwired range instead of a cord

Some installs, a slide-in range on a tight cabinet run or a cooktop with a factory whip, connect through a flexible conduit whip to a junction box rather than a plug. The circuit sizing does not change. The disconnect does: with a plug, the attachment plug and receptacle behind the drawer serve as the disconnect under 422.33; hardwired, 422.31(B) wants a switch or breaker within sight of the range, or a breaker capable of being locked open under 110.25. Within-Sight Disconnect Rules for Equipment owns that test. A garage panel 38 ft away through a wall is not within sight, so a hardwired version of this job would need either a disconnect within sight of the range or a lock-off attachment the breaker maker lists for that 40 A breaker, fastened so it stays.

The finish test

At the receptacle (step 6), nothing plugged in, CAT III meter:

121.2 plus 120.8 is 242, so the two legs to neutral add to the leg-to-leg reading, which is what a correctly landed neutral does. With nothing plugged in, an open neutral does not show up as two lopsided legs; it shows up as leg-to-W readings that wander or sit well below 120 V on a LoZ setting, and a W-to-G reading that is not near zero. Either one means lock out and find the neutral before the range is plugged in, because under load that open neutral becomes lopsided voltage on the range's 120 V controls, clock and lights.

After the range is set (step 8), run one large element and the bake element together for a few minutes, and confirm the breaker holds and the receptacle face is not warm to the back of your hand.

What changes the answer

• A bigger range. Note 1 to Table 220.55 raises Column C by 5 percent for each kW over 12. A 14 kW range is 2 kW over, so 10 percent: 8 kW times 1.10 is 8.8 kW, or 36.7 A at 240 V. The 40 A floor still governs, and the sheet does not change.
• A cooktop and wall ovens. Note 4 lets one counter-mounted cooktop and up to two wall ovens in the same room on one circuit be totaled by nameplate and treated as one range. Separate circuits size each unit by its nameplate.
• A 208Y/120 V building. Read the nameplate's 208 V rating, which is lower than its 240 V rating, and divide by 208, not 240.

References

• NFPA 70, National Electrical Code, 2023 edition (2020 where noted), as adopted: Table 220.55 and its notes, 210.19, Table 210.21(B)(3), 314.16, 334.80, Table 250.122, 422.31(B), 422.33, 110.3(B), 110.14(D), 110.25
• NFPA 70E, current edition, Article 120; 29 CFR 1910.333(b)(2)
• See related: Reading an Appliance Nameplate for Circuit Sizing
• See related: Within-Sight Disconnect Rules for Equipment
• Range manufacturer's installation instructions (receptacle zone, circuit rating, anti-tip bracket)