Parameter / Metric
Copper Conductor
Aluminum Conductor
Ampacity at 75°C based on NEC Table 310.15. Conduit sizes shown for Electrical Metallic Tubing (EMT) based on Appendix C Tables.
Ampacity of conductors based on 30° C ambient. Conduit sizes for aluminum based on the use of compact conductors.
★ #8 XHHW and XHHW-2 Cu requires 3/4" conduit for 3 wires.
+ #6 XHHW and XHHW-2 Cu requires 1" conduit for 4 wires.
3◇ 750 kcmil AL XHHW and XHHW-2 requires 3 1/2" conduit for 4 wires.