Does the weight include the conduit?

No. Conduit is a separate cost line. The weight is the conductors, including the ground allowance count.

Why might 150 feet step the wire up?

Ampacity may be satisfied by a smaller conductor that then fails the 3 percent drop. The minimum size meets both.

Can the yard quote aluminum instead?

Switch the conductor control or read the comparison table. Recheck the weight after the size changes.

Copper Wire Spool Weight for a 100 Amp, 150 Foot Feeder

A long copper feeder where the spool weight matters as much as the gauge.

Formula SSC-2026.1

K method · SSC-2026.1

Minimum size

2 AWG · 33.6 mm²

Single conductor set

Voltage drop

5.83 V

2.43% · end 234.2 V

Power loss

583 W

I²R at the operating current

Required ampacity

100.0 A

Each conductor 115 A

Material estimate

$2,248.50

3 conductors + PVC

Conductor weight

105.8 lb

48.0 kg · approximate insulated weight

Single-line and conductor gaugeLive scaled blueprint

Circle diameters track circular mils. The drawing is a schematic, not a conduit-fill layout.

Bill of materials and shopping list
Item	Net	Waste	Order	Unit price	Line total
copper 2 AWG · 33.6 mm²	150 ft one way	cuts excluded	3 conductors	USD	$2,106.00
PVC conduit	150 ft	—	150 ft	USD	$142.50

Copper versus aluminum at this run
Material	Minimum size	mm²	Drop	End voltage	Loss
copper	2 AWG · 33.6 mm²	33.6	2.43%	234.2 V	583 W
aluminum	1/0 AWG · 53.5 mm²	53.5	2.51%	234.0 V	602 W

Same load at other one-way distances
Distance	Minimum size	Drop	Percent	End voltage
75 ft	3 AWG · 26.7 mm²	3.68 V	1.53%	236.3 V
150 ft	2 AWG · 33.6 mm²	5.83 V	2.43%	234.2 V
200 ft	1 AWG · 42.4 mm²	6.17 V	2.57%	233.8 V

Show the deterministic formula

Single phase: Vdrop = 2 × K × I × D / cmil. Three phase: Vdrop = 1.732 × K × I × D / cmil. K is 12.9 for copper and 21.2 for aluminum. D is one-way feet.

Percent drop = Vdrop ÷ source voltage × 100. Green is 3% or less, amber is 3 to 5%, and red is over 5%. Power loss is I²R on the current-carrying conductors.

The smallest conductor that meets both the ampacity (125% when continuous) and the drop limit is selected. Ampacity does not include bundling or temperature correction.

Contractor sign-off

Project: Copper Wire Spool Weight for a 100 Amp, 150 Foot Feeder

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This sheet is an estimate for ordering and layout discussion. It is not a sealed design. Confirm the quantities with a licensed local professional and the authority having jurisdiction before you buy or build.

Engineering notes

The circuit is 100 A, 240 V, 150 ft, copper, 3 percent, in PVC. The weight line uses an approximate insulated-copper weight for the selected size times the conductor count. Aluminum is about a third of that weight at the same size, but it usually requires a larger size. Use the copper-versus-aluminum table, then the weight, before you choose a spool. The price per foot is editable because copper moves.

Code reference

NEC 210.19(A) and 215.2(A) informational notes recommend 3 percent on a branch circuit and 5 percent total with the feeder. Ampacity follows the 75°C column of Table 310.16 plus the small-conductor limits. Confirm the adopted edition.

Field questions

Does the weight include the conduit?: No. Conduit is a separate cost line. The weight is the conductors, including the ground allowance count.
Why might 150 feet step the wire up?: Ampacity may be satisfied by a smaller conductor that then fails the 3 percent drop. The minimum size meets both.
Can the yard quote aluminum instead?: Switch the conductor control or read the comparison table. Recheck the weight after the size changes.