Electric Range / Oven: Complete Wiring Guide
Bill of materials
Electric ranges and ovens are the largest single appliance load in most homes. A standard range needs a 50A/240V circuit with 6 AWG copper, using a NEMA 14-50R outlet (4-prong). NEC Table 220.55 allows demand factor reductions for ranges rated 12kW or less, which can reduce the required circuit size.
NEC 210.19(A)(3) allows a minimum 8 AWG for household cooking appliances per Table 220.55 demand load. A single range up to 12kW nameplate has a demand load of 8kW per Column A, which fits on a 40A circuit. Ranges over 12kW add the excess above 12kW at full value. New installations require 4-wire circuits (NEMA 14-50R); existing 3-wire (NEMA 10-50R) installations are grandfathered per 250.140 exception.
40A range circuit (small range < 8.75kW)
| Component | Specification | NEC basis |
|---|---|---|
| Wire (copper) | 8 AWG THHN | Table 310.16, 110.14(C) |
| Wire (aluminum alt.) | 6 AWG THHN | Table 310.16, 110.14(C) |
| Breaker | 40A double-pole | 240.4 |
| Voltage | 240V single-phase | |
| Conduit (EMT) | 3/4" EMT | Chapter 9 Table 4 |
| Max distance (3% VD) | 144 ft at 240V copper | 210.19(A) Note 4 |
50A range circuit (standard range)
| Component | Specification | NEC basis |
|---|---|---|
| Wire (copper) | 6 AWG THHN | Table 310.16, 110.14(C) |
| Wire (aluminum alt.) | 4 AWG THHN | Table 310.16, 110.14(C) |
| Breaker | 50A double-pole | 240.4 |
| Voltage | 240V single-phase | |
| Conduit (EMT) | 3/4" EMT | Chapter 9 Table 4 |
| Max distance (3% VD) | 182 ft at 240V copper | 210.19(A) Note 4 |
Installation notes
GFCI is not specifically required for this application by NEC, though local amendments may differ. Check with your local building department before starting work.
For the wire run, you have two options: NM-B cable (Romex) for interior runs through framing, or individual THHN conductors in conduit for exposed runs, outdoor installations, or runs through unfinished spaces. NM-B is faster to install but cannot be used outdoors or in conduit. For conduit, use EMT (metallic) or PVC Schedule 40.
Run length matters: every foot of wire adds voltage drop, reducing power to your equipment. The table below shows the exact voltage drop at common distances. If your run exceeds the 3% threshold, upsize one gauge.
Voltage drop by distance
Percentage voltage drop at common run lengths. NEC recommends 3% maximum for branch circuits and 5% for combined feeder plus branch.
| Distance | 8 AWG Co | 6 AWG Al | 6 AWG Co |
|---|---|---|---|
| 25 ft | 0.5% | 0.5% | 0.3% |
| 50 ft | 1.0% | 1.1% | 0.7% |
| 75 ft | 1.6% | 1.6% | 1.0% |
| 100 ft | 2.1% | 2.1% | 1.3% |
| 150 ft | 3.1% | 3.2% | 2.0% |
| 200 ft | 4.2% | 4.3% | 2.6% |
Common products for 8 AWG Copper circuits
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Related wire data
Detailed ampacity: 8 AWG copper, 6 AWG aluminum. Wire size lookup: 40A circuit. Calculators: voltage drop · panel load calculator.
Frequently asked questions
What wire size do I need for electric range / oven?
Use 8 AWG copper or 6 AWG aluminum on a 40A breaker at 240V. This is based on NEC 2023 Table 310.16 ampacity with 110.14(C) termination limits and 125% continuous load sizing per 210.19(A)(1).
Does electric range / oven require GFCI?
No. GFCI is not required for this application.
NEC 2023 references verified April 2026