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What Size Wire for 200 Amps at 100 Feet?

At 100 ft, the default 200 A result still matches the zero-length platform: 3/0 AWG copper or 250 kcmil aluminum, with termination and product choice governing before voltage drop.
Load
200 A
Distance
100 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 100 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 100 ft ChangesAt 100 ft, voltage drop is visible but not the governing constraint under the default 200 A setup. The practical work is confirming conductor product, lug temperature, meter/panel acceptance and whether the AHJ or utility treats this as service equipment rather than a generic feeder.

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
100 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 100 ft one-way.

Adjacent Distances at This Amp

Neighboring published lengths for 200 A under the same defaults.

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

100 ft Is the Short 200 A Platform

200 A feeder / service context for 200 A at 100 ft.

A 200 A run at 100 ft is often a service upgrade, meter-to-panel relocation, short detached-building feeder, or large residential subfeed. The user usually knows the 200 A rating and is checking whether distance changes the conductor.

Under the defaults on this page, 100 ft does not move the result above the zero-length conductor. That makes this page a service/feeder product and termination check, not a voltage-drop jump page.

What Changes This Long-Run Answer

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

  • Separate service from feeder

    A 200 A service lateral, service-entrance conductor and feeder can follow different product and approval paths. Do not use this as a utility standard by itself.

  • Confirm lugs before conductor

    The 3/0 copper or 250 kcmil aluminum result is only useful if the meter, panel or disconnect accepts that material and temperature rating.

  • Use 100 ft as the platform check

    Because the zero-length and 100 ft rows match under these defaults, this page tells you distance has not yet beaten the product/termination floor.

  • Watch the 250 ft break

    The published 150 ft and 200 ft pages stay on the same platform, but the 250 ft page jumps for voltage drop under the same assumptions.

200 A at 100 ft FAQs

What size wire for 200 amps at 100 feet?
Under the defaults on this page, start with 3/0 AWG copper or 250 kcmil aluminum. Termination and product assumptions govern, not voltage drop.
Does 100 ft require upsizing a 200 A feeder?
Not under these defaults. The 100 ft result matches the zero-length 200 A result, but product type, lugs, utility rules and AHJ requirements still need project review.
Is this a service conductor answer?
It is a planning result for a 200 A conductor under stated defaults. Service laterals and service-entrance conductors may be constrained by utility standards, equipment listings and local rules.
Should I use the 150 ft or 200 ft page instead?
Under these defaults, the 100 ft, 150 ft and 200 ft pages stay on the same conductor platform. If the measured route may approach 250 ft, compare the 250 ft page before ordering.