Conductor Sizes
Below is a chart that will assist in sizing conductors and conduits for both electrical distribution and equipment. The data
in the chart is based on the 2011 National Electrical Code, Table 310.15(B)(16) (formerly 310.16), Copper Conductors, Type "THHN" at 75º. This is the most commonly used material and method for wiring of all types of applications in both residential and commercial buildings.
Feeder Sizes for Copper Conductors
|
|---|
NOMINAL
AMPERE
RATING |
CONDUCTORS (3-PHASE,
4-WIRE WITH GROUND) |
CONDUIT
SIZE |
| 20 |
(4) #12 AWG, (1) #12 GRND |
1/2" |
| 30 |
(4) #10 AWG, (1) #10 GRND |
3/4" |
| 40 |
(4) #8 AWG, (1) #10 GRND |
3/4" |
| 50 |
(4) #6 AWG, (1) #10 GRND |
1" |
| 60 |
(4) #6 AWG, (1) #10 GRND |
1" |
| 70 |
(4) #4 AWG, (1) #10 GRND |
1-1/4" |
| 100 |
(4) #3 AWG, (1) #6 GRND |
1-1/4" |
| 125 |
(4) #1 AWG, (1) #6 GRND |
1-1/2" |
| 150 |
(4) #1/0 AWG, (1) #6 GRND |
2" |
| 175 |
(4) #2/0 AWG, (1) #6 GRND |
2" |
| 200 |
(4) #3/0 AWG, (1) #6 GRND |
2" |
| 225 |
(4) #4/0 AWG, (1) #4 GRND |
2-1/2" |
| 250 |
(4) #250 KCMIL, (1) #4 GRND |
2-1/2" |
| 300 |
(4) #350 KCMIL, (1) #4 GRND |
3" |
| 350 |
(4) #500 KCMIL, (1) #3 GRND |
3" |
| 400 |
(4) #500 KCMIL, (1) #3 GRND |
3" |
| 500 |
(4) #250 KCMIL, (1) #2 GRND
X 2 PARALLEL SETS |
3" X 2 |
| 600 |
(4) #350 KCMIL, (1) #1 GRND
X 2 PARALLEL SETS |
3" X 2 |
| 800 |
(4) #500 KCMIL, (1) #1/0 GRND
X 2 PARALLEL SETS |
3" X 2 |
| 1000 |
(4) #400 KCMIL, (1) #2/0 GRND
X 3 PARALLEL SETS |
3" X 3 |
| 1200 |
(4) #600 KCMIL, (1) #3/0 GRND
X 3 PARALLEL SETS |
4" X 3 |
| 1600 |
(4) #600 KCMIL, (1) #3/0 GRND
X 4 PARALLEL SETS |
4" X 4 |
|
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