Allowable ampacity for 10-2 copper NM-B is 30 A.
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A two conductor non metallic sheath cable is rated for 30 amps. Loading is to be 80% of its full load rating so legally it can be loaded to 24 amps.
Capacity for cable 70mm (143-212 amp) and may vary depending on installation method used.
The ampacity for copper is 1000A per square inch, in some places is 700A psi.
No. The larger the conductor the lower the resistance and the higher the ampacity.
The amperage rating is dependent upon the insulation rating. A pair of 25mm squared wires touching each other are rated at 131 amps. Three 25mm squared wires touching each other are rated at 110 amps.
If you want to operate the conductors maximum capacity, the conductor needs the heat, that the amperage produces, to be dissipated. This is why in the electrical code book there are two amperage ratings. The first one is for a free air rating which allows for a high ampacity of the wire. The other rating is for three conductors in a conduit which confines the cooling capacity and so the ampacity rating of these wires is lowered. The same procedure is used in cable spacings in ladder tray networks.