MCM is definitely an abbreviation for a large number of circular mils, a classic measurement of wire gauge. 1 MCM = 1 kcmil = .5067 square milimeters. A mil is 1/1000 inch. MCM is usually employed for large-diameter wire.
Measurements. 1000 circular mils or kcmil, the wire gauge is equivalent mix sectional area (500 MCM = 500,000 circular mils ) Million cubic metre, the system of volume.
MCM is an abbreviation for thousands of circular mils, an old measurement of wire gauge. 1 MCM = 1 kcmil = 0.5067 square milimeters. A mil is 1/1000 inch. A wire 200 mils in diameter is 40 MCM.
kcmil Wire Size Chart (Copper Wire)
| kcmil or MCM Wire: | mm2 (Diameter): | Ampacity At 60°C (140°F): | Ampacity At 75°C (167°F): | Ampacity At 90°C (194°F): |
| 250 kcmil (250 MCM) | 126.7 mm2 | 215 Amps | 255 Amps | 290 Amps |
| 300 kcmil (300 MCM) | 152.0 mm2 | 240 Amps | 285 Amps | 320 Amps |
| 350 kcmil (350 MCM) | 177.3 mm2 | 260 Amps | 310 Amps | 350 Amps |
| 400 kcmil (400 MCM) | 202.7 mm2 | 280 Amps | 335 Amps | 380 Amps |
| 500 kcmil (500 MCM) | 253.4 mm2 | 320 Amps | 380 Amps | 430 Amps |
| 600 kcmil (600 MCM) | 304.0 mm2 | 355 Amps | 420 Amps | 475 Amps |
| 700 kcmil (700 MCM) | 354.7 mm2 | 385 Amps | 460 Amps | 520 Amps |
| 750 kcmil (750 MCM) | 380.0 mm2 | 400 Amps | 475 Amps | 535 Amps |
| 800 kcmil (800 MCM) | 405.4 mm2 | 410 Amps | 490 Amps | 555 Amps |
| 900 kcmil (900 MCM) | 456.0 mm2 | 435 Amps | 520 Amps | 585 Amps |
| 1000 kcmil (1000 MCM) | 506.7 mm2 | 455 Amps | 545 Amps | 615 Amps |
| 1250 kcmil (1250 MCM) | 633.4 mm2 | 495 Amps | 590 Amps | 665 Amps |
| 1500 kcmil (1500 MCM) | 760.1 mm2 | 520 Amps | 625 Amps | 705 Amps |
| 1750 kcmil (1750 MCM) | 886.7 mm2 | 545 Amps | 650 Amps | 735 Amps |
| 2000 kcmil (2000 MCM) | 1013.4 mm2 | 560 Amps | 665 Amps | 750 Amps |
‘Which temperature should I look for ampacity?’ This is one of the most common questions from people who see this kcmil copper wire size chart.
Basically, it depends on which type of wire you have. You should look at:
The same goes for the MCM aluminum wires. You can find the ampacity chart for kcmil aluminum wires here:
What is 500 mcm cable used for?
500 MCM / 500 KCMIL 600 -volt Copper THHN THWN-2 can be used like a building wire for industrial and commercial applications.
AWG To kcmil Calculator (2nd AWG To MCM Calculator)
This is the 2nd calculator. Just insert the AWG wire size and the calculator will automatically determine what kcmil number (or MCM number) would such an AWG wire has:
For an even easier way to find kcmil and AWG wire numbers, you can use these two charts:
FAQ
Is 250 mcm the same as 250 kcmil?
What is kcmil wire?
What size is kcmil?
What size wire is 400 kcmil?
