Wire Size GuideNEC 2023 · 2026 · Updated Apr 2026

What wire size for a 200 amp circuit?

Q: What is the minimum wire size for a 200 amp circuit?

The minimum wire size is 3/0 AWG copper or 4/0 AWG aluminum per NEC 2023 Table 310.16 with 110.14(C) termination limits applied. For long runs, you may need to upsize to account for voltage drop. See the max distance table above.

Q: Can I use aluminum wire for a 200 amp circuit?

Yes. 4/0 AWG aluminum handles 200A. Aluminum requires anti-oxidant compound and AL-rated terminals (marked AL/CU on the device). It costs roughly 40-60% less than copper but requires a larger gauge for equivalent ampacity. See the 3/0 AWG copper vs aluminum comparison.

Q: How far can I run 3/0 AWG wire on a 200 amp circuit?

At 240V, 3/0 AWG copper can run approximately 234 feet before exceeding the 3% voltage drop recommendation. For longer distances, upsize to the next gauge. Use the voltage drop calculator for your exact scenario.

Q: What breaker size for a 200 amp circuit?

Use a 200A breaker. The breaker must match the circuit rating, not the wire ampacity. For continuous loads (like EV chargers), the breaker must be rated at 125% of the load per NEC 210.19(A)(1).

For a 200A circuit on a 200A breaker: Use 3/0 AWG copper (200A capacity) or 4/0 AWG aluminum (200A capacity). Common applications: 200A main service entrance wire, whole-house panel upgrades, and 200A service wire sizing.

Copper3/0 AWG

Aluminum4/0 AWG

Breaker200A

Voltage240V

You\'re upgrading to 200A because your panel is full and you need to add an EV charger, heat pump, or induction cooktop. Or you\'re buying a house with a 100A service and the inspector flagged it as undersized. The 200A upgrade is the single most expensive residential electrical project most homeowners face.

All valid wire sizes for a 200 amp circuit

A 200 amp service is the modern residential standard. The 200 amp service wire is 2/0 AWG copper or 4/0 AWG aluminum per NEC Table 310.15(B)(7). For general 200A circuits per Table 310.16, the minimum is 3/0 AWG copper or 250 kcmil aluminum. This project requires a licensed electrician and utility coordination.

Dwelling service conductors are sized per NEC Table 310.15(B)(7), which permits smaller conductors than Table 310.16 for 120/240V single-phase services. NEC 250.52 requires a grounding electrode system: two ground rods 6+ feet apart or one rod plus a supplemental electrode.

Common mistake: The most common 200A mistake is using Table 310.16 to size service entrance conductors instead of Table 310.15(B)(7). For a dwelling unit 120/240V service, 310.15(B)(7) allows 2/0 copper or 4/0 aluminum - one full size smaller than 310.16 would require. The second mistake: sizing the grounding electrode conductor from Table 250.122 (equipment grounding) instead of Table 250.66 (grounding electrode). For 4/0 aluminum service conductors, the GEC is 4 AWG copper per Table 250.66 - not 6 AWG, which is the EGC from Table 250.122. Mixing these two tables is the most common grounding error on service upgrades. The third: not coordinating with the utility before starting. They own the meter base and service drop and set the timeline.

Any gauge with ampacity equal to or greater than 200A per NEC 2023 Table 310.16, after 110.14(C) termination limits are applied. Smaller gauge number means thicker wire, higher cost, but lower voltage drop.

Gauge	Material	Capacity	Max distance (3% drop)	Conduit
3/0 AWG (minimum)	Copper	200A	234 ft	2" EMT
4/0 AWG	Copper	230A	297 ft	2" EMT
2/0 AWG (310.15(B)(7))	Copper	200A	186 ft	2" EMT
4/0 AWG (dwelling service, 310.15(B)(7))	Aluminum	200A	179 ft	2" EMT

Maximum wire run distance

One-way distance in feet before voltage drop exceeds 3%, per NEC Chapter 9 Table 8 resistance values. If your run is longer than these distances, upsize one gauge.

Gauge	Material	120V	208V	240V	480V
3/0 AWG	Copper	117 ft	204 ft	234 ft	468 ft
4/0 AWG	Copper	147 ft	256 ft	297 ft	588 ft
2/0 AWG	Copper	93 ft	161 ft	186 ft	370 ft
4/0 AWG	Aluminum	90 ft	156 ft	179 ft	361 ft

Common 200A circuit projects

200A service entrance

The service entrance includes the weatherhead, service entrance cable (or conduit with conductors), meter base, and main breaker panel. Use 4/0 AWG aluminum SER cable or 2/0 copper per NEC 310.15(B)(7). The grounding electrode system needs two ground rods at least 6 feet apart, plus bonding to the water pipe if metallic. Budget 2-4 weeks for the permit, utility disconnect, inspection, and reconnection.

200A panel upgrade

Replacing a Federal Pacific, Zinsco, or full 100A panel with a 200A main-lug or main-breaker panel. The new panel should have at least 40 spaces - 30-space panels fill up immediately. Mount the panel at the same location if possible to reuse existing branch circuit wiring. Label every circuit before disconnecting the old panel.

main service feeder

A 200A feeder from the meter to an indoor main panel (when the meter is outside and the panel is inside) uses 2/0 copper or 4/0 aluminum in conduit or as SER cable. Keep the run as short as possible - every foot of 4/0 aluminum adds cost. The conduit from the meter to the panel must be sized for the conductor fill per NEC Chapter 9.

200A service wire (copper or aluminum)

Aluminum is the standard choice for 200A service entrance conductors. 4/0 AWG aluminum costs roughly 40% of what 2/0 copper costs and is lighter to pull. Use anti-oxidant compound on all aluminum terminations. The main breaker lugs must be rated AL/CU. For underground service, use USE-2 or XHHW-2 conductors in PVC conduit.

Frequently asked questions

What is the minimum wire size for a 200 amp circuit?

The minimum wire size is 3/0 AWG copper or 4/0 AWG aluminum per NEC 2023 Table 310.16 with 110.14(C) termination limits applied. For long runs, you may need to upsize to account for voltage drop. See the max distance table above.

Can I use aluminum wire for a 200 amp circuit?

Yes. 4/0 AWG aluminum handles 200A. Aluminum requires anti-oxidant compound and AL-rated terminals (marked AL/CU on the device). It costs roughly 40-60% less than copper but requires a larger gauge for equivalent ampacity. See the 3/0 AWG copper vs aluminum comparison.

How far can I run 3/0 AWG wire on a 200 amp circuit?

At 240V, 3/0 AWG copper can run approximately 234 feet before exceeding the 3% voltage drop recommendation. For longer distances, upsize to the next gauge. Use the voltage drop calculator for your exact scenario.

What breaker size for a 200 amp circuit?

Use a 200A breaker. The breaker must match the circuit rating, not the wire ampacity. For continuous loads (like EV chargers), the breaker must be rated at 125% of the load per NEC 210.19(A)(1).

Do I need GFCI on a 200 amp circuit?

GFCI requirements depend on location, not amperage. NEC 2023 requires GFCI in kitchens, bathrooms, garages, outdoors, basements, laundry areas, and near sinks. Check the GFCI requirements by room for your specific installation.

Common products for 3/0 AWG Copper circuits

🧵Wire3/0 AWG copperCheck prices on Amazon (paid link) ⚡200A PanelMain service panelCheck prices on Amazon (paid link) 📏Conduit2" EMT for 3/0 AWGCheck prices on Amazon (paid link)

As an Amazon Associate we earn from qualifying purchases.

Requirements vary by state. NEC edition, licensing, permits, and GFCI rules differ by jurisdiction. Check your state or pick it below for personalized info across WireRef.

Important: For reference only. Not a substitute for a licensed electrician. Electrical work can cause serious injury, death, fire, or property damage if performed incorrectly. Always hire a licensed electrician for electrical work, especially for service upgrades, panel work, and 240V circuits. Values are derived from NFPA 70 (NEC) for educational purposes. Always verify against your locally adopted NEC edition and amendments - local jurisdictions may enforce stricter requirements. WireRef provides reference information only and is not responsible for work performed based on this content. NEC® is a registered trademark of the National Fire Protection Association. Free NEC access via NFPA · OSHA Electrical Safety · Terms of use.

NEC 2023 references verified April 2026