EV Charger Level 2 (50A, 240V) Wire Gauge — NEC 2023 Sizing Guide

Tesla Wall Connector or equivalent 50A Level 2 EVSE. Use 8 AWG copper. 50A at 50 ft on 240V: 1.63% voltage drop.

8 AWG

copper conductor

1.63%

voltage drop

50A

ampacity

Load current (amps)

One-way distance (ft)

System voltage

Conductor

Insulation temp

Max VD% (NEC rec 3%)

Phase

Advanced options — derating, breaker & conduit

Conductors in raceway

Ambient temperature

Continuous load (3+ hrs)Breaker ≥ 125% per NEC 210.19

8 AWGcopper

Ampacity OKVD 1.63%

8 AWG selected by ampacity (50A ≥ 50A).

Ampacity50Aat 75°C

Voltage drop1.63%3.91V

At load236.1Vreceiving end

Circular mils16,5108.37 mm²

Min for ampacitygoverns

8 AWG

16,510 CM

Min for ≤3% VD

10 AWG

10,380 CM

Breaker size50ANEC 240.6(A)

Wire cost est.~$115100 ft THHN

Conduit size1" EMT3 conductors

Ground (EGC)10 AWG CuNEC 250.122

Power loss191W~$234.25/yr

Copper vs Aluminum (for 50A at 50 ft on 240V)

Copper

8 AWG

VD: 1.6% · 8.37 mm²

Aluminum

6 AWG

VD: 1.7% · 13.3 mm²

Verify this result

This answer is computed by WireGaugeEngine.sizeWire (v1.0.0), current for the NEC 2023 edition. The same inputs always produce the same figure and the same fingerprint below, so you can reproduce and cite it.

Standards

NEC 2023 — Table 310.16 (allowable ampacities)
ASTM B258-18 — AWG diameters and cross-sectional areas

Assumptions

Conductor materialcopper
Temperature rating75°C column
Phasesingle
Current-carrying conductors3
Ambient temperature30°C
Max voltage drop3%

Inputs & outputs

in · amps50
in · voltage240
in · distanceFt50
in · phasesingle
in · materialcopper
in · tempRating75
in · conductorCount3
in · ambientTempC30
in · maxVdropPct3
out · recommendedWire8 AWG
out · ampacity50
out · voltageDropPct1.63
out · breakerAmps50
out · groundWire10 AWG Cu
out · conduit1"
out · vdropDrivenfalse

Computation fingerprint (SHA-256)

66bf5889ba188442b495df118298a7e5330364b2b1867146d77212cee2067758

EV Charger Level 2 (50A, 240V) Wire Gauge — NEC 2023 Sizing Guide

41 requires the circuit to be rated at 125 % of the equipment's maximum current, because charging runs for hours at a steady draw. This preset models a 50 A draw at 240 V over 50 ft of copper at the 75 °C termination rating. 6 %. 122.

EV Charger Level 2 (50A, 240V)

Tesla Wall Connector or equivalent 50A Level 2 EVSE.

For a 50A load at 50 ft on 240V, use 8 AWG copper.

Tesla Wall Connector, ChargePoint Home Flex — 50A/11.5kW max

Required wire gauge

Ampacity governs

8 AWG copper

50A ampacity | 1.63% voltage drop | 240V system

Circuit specifications

NEC 2023 compliant. Min wire for ampacity: 8 AWG. Min wire for 3% VD: 10 AWG.

Specification	Value
Application	EV Charger Level 2 (50A, 240V)
Load current	50A
System voltage	240V single-phase
One-way run distance	50 ft
Conductor material	copper
Temp rating	75°C

Showing 6 of 11 rows for Specification.

Preset distance sensitivity

How EV Charger Level 2 (50A, 240V) sizing changes as one-way run distance changes.

One-way distance	Recommended gauge	Voltage drop	Receiving voltage	Governing constraint
25 ft	8 AWG	0.81%	238V	Ampacity
50 ft	8 AWG	1.63%	236.1V	Ampacity
75 ft	8 AWG	2.44%	234.1V	Ampacity
100 ft	6 AWG	2.05%	235.1V	Voltage drop
150 ft	4 AWG	1.93%	235.4V	Voltage drop
200 ft	4 AWG	2.58%	233.8V	Voltage drop

Installation planning checklist

Checklist values are generated from the preset and must be confirmed against the actual equipment and local code before installation.

Check	Preset value	Field confirmation needed
Equipment/load	50A residential	Confirm nameplate MCA/MOCP or calculated load.
Voltage/phase	240V single-phase	Confirm supply system and breaker panel compatibility.
Conductor	8 AWG copper	Confirm insulation type, terminal temperature, and conductor material rating.
Voltage drop	1.63%	Confirm the project target is 3% or stricter.
Ground wire	8 AWG Cu	Confirm EGC size from final overcurrent protection.
Raceway	1"	Confirm conduit fill with all conductors in the actual raceway.

Copper vs aluminum preset alternatives

Preset alternatives keep the same load, voltage, distance, and voltage-drop target while changing conductor material.

Material	Recommended gauge	Ampacity	Voltage drop	Cost estimate	Planning note
copper	8 AWG	50A	1.63%	$115	Common baseline for branch-circuit planning.
aluminum	6 AWG	50A	1.68%	$110	Confirm AL-rated terminals and local rules.

Preset assumptions

This preset models 50A, 240V single-phase, 50 ft one-way, copper conductor, 75C temperature rating, and 3% maximum voltage drop.

Presets are planning shortcuts for common search intents. The equipment nameplate, MCA/MOCP values, continuous-load status, conductor count, ambient temperature, and local amendments can change the final answer.

Common use: Tesla Wall Connector, ChargePoint Home Flex — 50A/11.5kW max

Preset wire sizing FAQ

Can I use this preset for every residential project?
No. The preset is a high-confidence planning model for a common setup, but equipment nameplate values, local code, and installation conditions can override it.

Why does distance change wire size?
Longer runs increase circuit resistance and voltage drop, so the same amperage can require a larger conductor at longer distances.

Can aluminum replace copper in this preset?
Only with AL-rated terminations and approved installation methods. Use the material alternatives table to compare gauge, ampacity, voltage drop, and cost.

What field details must be checked?
Confirm breaker size, conductor material, insulation, terminal temperature, raceway fill, conductor count, ambient temperature, wet-location rules, and local amendments.

Common mistakes with a 50 A, 240 V EV charger circuit

Wiring it with 8/2 NM-B because "8 AWG is the answer." The 50 A rating for 8 AWG is the 75 °C column; NM-B is limited to 60 °C (NEC 334.80), where 8 AWG carries only 40 A. A 50 A continuous circuit in NM-B needs 6 AWG. The 8 AWG result on this page assumes THHN/THWN-2 or similar in conduit with 75 °C-rated terminations per NEC 110.14(C).

Confusing breaker size with charge rate.

a 50 A, 240 V EV charger circuit — frequently asked questions

Why does this page pair 8 AWG wire with a 70 A breaker?
Because the two are sized by different rules for a continuous load. The conductor must carry the 50 A draw (8 AWG at 75 °C = 50 A, Table 310.16). The overcurrent device must be at least 125 % of the continuous current — 62.5 A — and NEC 240.6(A)'s next standard size is 70 A. NEC 240.4(B) permits protecting a 50 A conductor at the next standard device size in this arrangement; installers who prefer visible margin run 6 AWG instead, and many do.

Can aluminum be used for this circuit?
Yes, and for feeders of this size it is common. The equivalent aluminum conductor is larger — 6 AWG aluminum carries 40 A at 60 °C and 50 A at 75 °C, so a 50 A continuous EV circuit in aluminum typically lands at 4 AWG. Terminations must be rated AL, prepared per the lug manufacturer's instructions, and torqued to specification.

Does 1.6 % voltage drop matter for charging speed?
Practically, no. The EVSE and the vehicle's onboard charger regulate charging current; a 3.9 V sag at the input translates to roughly 190 W of loss in the cable at full draw — about 1.6 % of an 11–12 kW session, or a few cents per charge. Drop starts to matter on long detached-garage feeders of 100 ft and more, where the same math can push the conductor up a size.

Sources & Standards

National Fire Protection Association. "NFPA 70: National Electrical Code," Table 310.16, 2023 Edition.Allowable ampacities of insulated copper and aluminum conductors (60°C / 75°C / 90°C columns) used in wire sizing
ASTM International. "Standard Specification for Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors." ASTM B258-18, 2018.AWG conductor diameters and cross-sectional areas used in gauge conversions

Other common circuits

Kitchen Outlet Circuit (20A, 120V)10 AWG copper20A • 120V • 50ft Electric Dryer (30A, 240V)10 AWG copper30A • 240V • 25ft Electric Range / Oven (50A, 240V)6 AWG copper50A • 240V • 25ft Hot Tub / Spa (50A, 240V)8 AWG copper50A • 240V • 60ft Subpanel Feeder (100A, 240V)1 AWG aluminum100A • 240V • 75ft Workshop Tool Circuit (30A, 240V)10 AWG copper30A • 240V • 75ft

EV Charger Level 2 (50A, 240V) Wire Gauge — NEC 2023 Sizing Guide

Tesla Wall Connector or equivalent 50A Level 2 EVSE. Use 8 AWG copper. 50A at 50 ft on 240V: 1.63% voltage drop.

8 AWG

copper conductor

1.63%

voltage drop

50A

ampacity

Load current (amps)

One-way distance (ft)

System voltage

Conductor

Insulation temp

Max VD% (NEC rec 3%)

Phase

Advanced options — derating, breaker & conduit

Conductors in raceway

Ambient temperature

Continuous load (3+ hrs)Breaker ≥ 125% per NEC 210.19

8 AWGcopper

Ampacity OKVD 1.63%

8 AWG selected by ampacity (50A ≥ 50A).

Ampacity50Aat 75°C

Voltage drop1.63%3.91V

At load236.1Vreceiving end

Circular mils16,5108.37 mm²

Min for ampacitygoverns

8 AWG

16,510 CM

Min for ≤3% VD

10 AWG

10,380 CM

Breaker size50ANEC 240.6(A)

Wire cost est.~$115100 ft THHN

Conduit size1" EMT3 conductors

Ground (EGC)10 AWG CuNEC 250.122

Power loss191W~$234.25/yr

Copper vs Aluminum (for 50A at 50 ft on 240V)

Copper

8 AWG

VD: 1.6% · 8.37 mm²

Aluminum

6 AWG

VD: 1.7% · 13.3 mm²

Verify this result

Standards

NEC 2023 — Table 310.16 (allowable ampacities)
ASTM B258-18 — AWG diameters and cross-sectional areas

Assumptions

Conductor materialcopper
Temperature rating75°C column
Phasesingle
Current-carrying conductors3
Ambient temperature30°C
Max voltage drop3%

Inputs & outputs

in · amps50
in · voltage240
in · distanceFt50
in · phasesingle
in · materialcopper
in · tempRating75
in · conductorCount3
in · ambientTempC30
in · maxVdropPct3
out · recommendedWire8 AWG
out · ampacity50
out · voltageDropPct1.63
out · breakerAmps50
out · groundWire10 AWG Cu
out · conduit1"
out · vdropDrivenfalse

Computation fingerprint (SHA-256)

66bf5889ba188442b495df118298a7e5330364b2b1867146d77212cee2067758

EV Charger Level 2 (50A, 240V) Wire Gauge — NEC 2023 Sizing Guide

EV Charger Level 2 (50A, 240V)

Tesla Wall Connector or equivalent 50A Level 2 EVSE.

For a 50A load at 50 ft on 240V, use 8 AWG copper.

Tesla Wall Connector, ChargePoint Home Flex — 50A/11.5kW max

Required wire gauge

Ampacity governs

8 AWG copper

50A ampacity | 1.63% voltage drop | 240V system

Circuit specifications

NEC 2023 compliant. Min wire for ampacity: 8 AWG. Min wire for 3% VD: 10 AWG.

Specification	Value
Application	EV Charger Level 2 (50A, 240V)
Load current	50A
System voltage	240V single-phase
One-way run distance	50 ft
Conductor material	copper
Temp rating	75°C

Showing 6 of 11 rows for Specification.

Preset distance sensitivity

How EV Charger Level 2 (50A, 240V) sizing changes as one-way run distance changes.

One-way distance	Recommended gauge	Voltage drop	Receiving voltage	Governing constraint
25 ft	8 AWG	0.81%	238V	Ampacity
50 ft	8 AWG	1.63%	236.1V	Ampacity
75 ft	8 AWG	2.44%	234.1V	Ampacity
100 ft	6 AWG	2.05%	235.1V	Voltage drop
150 ft	4 AWG	1.93%	235.4V	Voltage drop
200 ft	4 AWG	2.58%	233.8V	Voltage drop

Installation planning checklist

Checklist values are generated from the preset and must be confirmed against the actual equipment and local code before installation.

Check	Preset value	Field confirmation needed
Equipment/load	50A residential	Confirm nameplate MCA/MOCP or calculated load.
Voltage/phase	240V single-phase	Confirm supply system and breaker panel compatibility.
Conductor	8 AWG copper	Confirm insulation type, terminal temperature, and conductor material rating.
Voltage drop	1.63%	Confirm the project target is 3% or stricter.
Ground wire	8 AWG Cu	Confirm EGC size from final overcurrent protection.
Raceway	1"	Confirm conduit fill with all conductors in the actual raceway.

Copper vs aluminum preset alternatives

Preset alternatives keep the same load, voltage, distance, and voltage-drop target while changing conductor material.

Material	Recommended gauge	Ampacity	Voltage drop	Cost estimate	Planning note
copper	8 AWG	50A	1.63%	$115	Common baseline for branch-circuit planning.
aluminum	6 AWG	50A	1.68%	$110	Confirm AL-rated terminals and local rules.

Preset assumptions

This preset models 50A, 240V single-phase, 50 ft one-way, copper conductor, 75C temperature rating, and 3% maximum voltage drop.

Common use: Tesla Wall Connector, ChargePoint Home Flex — 50A/11.5kW max

Preset wire sizing FAQ

Why does distance change wire size?
Longer runs increase circuit resistance and voltage drop, so the same amperage can require a larger conductor at longer distances.

Common mistakes with a 50 A, 240 V EV charger circuit

Confusing breaker size with charge rate.

a 50 A, 240 V EV charger circuit — frequently asked questions

Sources & Standards

National Fire Protection Association. "NFPA 70: National Electrical Code," Table 310.16, 2023 Edition.Allowable ampacities of insulated copper and aluminum conductors (60°C / 75°C / 90°C columns) used in wire sizing
ASTM International. "Standard Specification for Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors." ASTM B258-18, 2018.AWG conductor diameters and cross-sectional areas used in gauge conversions