Conductor Ampacity Chart

No. We do not publish a copyrighted table dump.

Find a planning ampacity, then verify it in the current table for your termination temperature.

This is not an official NEC table.

Size	Cu 60	Cu 75	Cu 90	Al 60	Al 75	Al 90
14 AWG	15	20	25	—	—	—
12 AWG	20	25	30	15	20	25
10 AWG	30	35	40	25	30	35
8 AWG	40	50	55	35	40	45
6 AWG	55	65	75	40	50	55
4 AWG	70	85	95	55	65	75
3 AWG	85	100	110	65	75	85
2 AWG	95	115	130	75	90	100
1 AWG	110	130	145	85	100	115
1/0 AWG	125	150	170	100	120	135
2/0 AWG	145	175	195	115	135	150
3/0 AWG	165	200	225	130	155	175
4/0 AWG	195	230	260	150	180	205
250 kcmil	215	255	290	170	205	230
300 kcmil	240	285	320	190	230	260
350 kcmil	260	310	350	210	250	280
400 kcmil	280	335	380	225	270	305
500 kcmil	320	380	430	260	310	350

How to use this chart

Pick the size, metal, and the temperature column that matches the termination rating.

Read the planning ampacity, then take that size to the wire size calculator if the run is long.

Do not stop at ampacity on a long feeder or branch.

This is not an official NEC reprint and not NFPA software.

It is a short planning summary with stated assumptions.

Ambient correction, bundling, dwelling modifiers, and equipment listing can change the number.

Is this the official NEC ampacity table?

No. It is a planning summary. Use the current code book or an authorized source for the installation.

Which temperature column should I use?

Use the column allowed by the termination rating and the conductor insulation. When they differ, the lower one usually governs.

Why does the wire size calculator sometimes pick a larger size than this chart?

Voltage drop. Ampacity can pass while the long-run percent fails.

Can I download the full NEC table here?