10 AWG copper = 30 amps (based on NEC 310.16 for 90°C insulation).
30 A × 0.80 (temp) × 0.70 (bundling) = 16.8 amps . derating calculator
For 50°C ambient with 90°C wire: Many tables show a factor of 0.80 . 10 AWG copper = 30 amps (based on NEC 310