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What Size Wire for 200 Amps at 150 Feet?

At 150 ft, the default 200 A result remains on the 3/0 copper or 250 kcmil aluminum platform, but the route is long enough that measurement, product family and future 250 ft risk matter.
Load
200 A
Distance
150 ft
Band
200 A feeder / service
Defaults
Non-continuous, 75 C lugs, 86 F, 240 V single-phase

Computed Starting Point

Ampacity and voltage drop under common defaults for this amp and distance.

MaterialComputed sizeOCPDUsable ampacityGoverning constraintDefault check
Copper3/0 AWG200 A200 ATermination rated 75 CPasses defaults
Aluminum250 kcmil200 A205 ATermination rated 75 CPasses defaults
What Size Wire for 200 Amps at 150 Feet? under common non-continuous defaults: THHN or XHHW-2 insulation, 75 C terminations, 86 F ambient, 240 V single-phase and no more than three current-carrying conductors.

What 150 ft ChangesAt 150 ft, the conductor size has not changed under the default 200 A model, but the margin is no longer casual. Field measurement, underground routing, service-equipment placement and product selection deserve more attention than another ampacity chart lookup.

Run the wire size calculatorCheck voltage drop alone

Zero-Length vs This Distance

If the distance-adjusted size is larger, voltage drop governed under these defaults.

CaseCopper sizeCopper constraintAluminum sizeAluminum constraint
Ampacity only (0 ft)3/0 AWGTermination rated 75 C250 kcmilTermination rated 75 C
150 ft (this page)3/0 AWGTermination rated 75 C250 kcmilTermination rated 75 C
Copper and aluminum sizes for 200 A with no distance entered versus 150 ft one-way.

Adjacent Distances at This Amp

Neighboring published lengths for 200 A under the same defaults.

DistanceCopper sizeAluminum sizeCopper constraint
100 ft3/0 AWG250 kcmilTermination rated 75 C
150 ft (this page)3/0 AWG250 kcmilTermination rated 75 C
200 ft3/0 AWG250 kcmilTermination rated 75 C
200 A copper and aluminum starting sizes across neighboring distance pages.

150 ft Is the Measurement Buffer

200 A feeder / service context for 200 A at 150 ft.

A 150 ft 200 A search often starts as a panel relocation, barn or shop feeder, or service lateral that looked comfortably short on the site plan. The real question is whether the measured conductor path still belongs on the short-run platform.

Under the defaults, 150 ft has the same conductor result as 100 ft and 200 ft. That sameness is useful: the page marks a plateau, while warning that detours and risers can push the job toward the 250 ft jump.

What Changes This Long-Run Answer

Checks that matter for distance-governed sizing in this amp band.

  • Measure the conductor path

    Count sweeps, risers, wall offsets and equipment placement. A nominal 150 ft route can grow enough to make the adjacent distance pages matter.

  • Keep product family explicit

    SER, URD-style assemblies and individual THHN/XHHW conductors in raceway do not always share the same usable assumptions. Match the result to the installed product.

  • Check the 250 ft jump early

    The 200 ft page still stays on the same platform under these defaults, but the 250 ft page upsizes for voltage drop. Compare before final trench layout.

  • Do not oversell voltage drop

    The default result is still termination-governed here. Treat drop as a checked constraint, not the reason to upsize at 150 ft under these assumptions.

200 A at 150 ft FAQs

What size wire for 200 amps at 150 feet?
Under the defaults on this page, start with 3/0 AWG copper or 250 kcmil aluminum. The result remains termination/product governed.
Why is 150 ft the same size as 100 ft?
Because voltage drop has not beaten the termination/product floor under these defaults. The zero-length, 100 ft, 150 ft and 200 ft rows are still on the same platform.
When should I move from the 150 ft page to a longer-distance check?
Use the longer page when the measured one-way conductor path, including risers and detours, is closer to 200 ft or 250 ft than the plan estimate.
Is this a service lateral answer or feeder answer?
It is a planning page under stated defaults. Service laterals may be controlled by utility and meter equipment rules, while feeders still need load, raceway and termination checks.