Current Carrying Capacity Table -
A naive reading of a table might suggest that a "10 AWG copper wire" is always rated for 30 amps. In reality, the table is a matrix of dependencies. The most critical variable is . A wire in a 30°C (86°F) room can carry more current than the same wire in a 50°C (122°F) attic, because the air is less effective at cooling the conductor.
| Cross-Sectional Area (mm²) | AWG Equivalent (Approx) | Single Core (In Conduit/Trunking) | Multi-Core (Flat Twin & Earth) | Single Core (In Free Air) | | :--- | :--- | :--- | :--- | :--- | | | 18 AWG | 13.5 A | 11.5 A | 19.5 A | | 1.5 mm² | 16 AWG | 18.5 A | 15.5 A | 24 A | | 2.5 mm² | 14 AWG | 25 A | 20 A | 32 A | | 4.0 mm² | 12 AWG | 34 A | 26 A | 42 A | | 6.0 mm² | 10 AWG | 43 A | 32 A | 54 A | | 10 mm² | 8 AWG | 60 A | 44 A | 75 A | | 16 mm² | 6 AWG | 80 A | 57 A | 100 A | | 25 mm² | 4 AWG | 101 A | 76 A | 127 A | | 35 mm² | 2 AWG | 126 A | 94 A | 158 A | | 50 mm² | 1/0 AWG | 153 A | 114 A | 196 A | current carrying capacity table
You now look at the table. You do not look for a cable rated for 32A; you look for a cable rated for 52.5A . A naive reading of a table might suggest
Most standard tables assume "perfect" laboratory conditions. Before using the numbers below, you must understand that the base ratings assume: A wire in a 30°C (86°F) room can