you should know by now that you really need to supply a bit more information for this and your other queries such as:
Location
Regulations being used
Domestic or industrial
Power being transmitted
Voltage
Your ole in this
Contractor or designer
etc
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
Weĺl if you want to use solid cables larger than #10 AWG or possibly #8AWG you may need a special construction sich as Mineral Insulated cable.
In the absence of dpecial conditions Orth American codes do not care.
-------------------- Ohm's law
Not just a good idea; It's the LAW!