Copper Wire Size For 100 Amp Subpanel. If the answer is yes then you need to run at least #3 copper or a #1 aluminum conductors. Awg 1 copper or awg 3 copper? For 100 amps, the wire size that i would suggest using a #2 awg copper cable.
Do i have to buy all 3 wires (2 hot and 1 neutral) the same size?
The 100 amp panel determines what ampacity the panels bussing is, not what the load will be… are you figuring on using the whole 100 amps eventually….? Only moved from in a much earlier thread jw advised me that this is the correct wire size, which is what i had already bought. No new circuits are being added; #2 awg size wire is code and the right size wire for 100 amps. What are you trying to feed with this subpanel? Single conductor #3 gauge thhn copper wire needs to be buried in a conduit Copper aluminum carbon steel electrical steel gold nichrome nickel silver. You need #3 copper wire with a minimum of #8 copper wire for a ground to feed a 100 amp panel.
