10 amps is the maximum it will carry.
The amp size of a wire is determined by its gauge, not the number of wires. An 8-gauge wire is typically rated for around 40-60 amps, depending on the type and insulation of the wire.
10
A #14 wire will do fine for grounding a 20 amp device. That is the size of the ground wire in a 2 conductor # 12 wire building cable.
You will need to use #8 wire.
Yes, no problem at all going to a larger ampacity of wire. Larger size wire yes, smaller size wire no.
16 mm to 18 mm
The recommended wire size for a 20 amp breaker is typically 12-gauge wire.
The recommended wire size for a 30 amp circuit is typically 10 gauge wire.
The recommended wire size for a 60 amp circuit is typically 6-gauge wire.
The appropriate wire size for a 20 amp circuit is typically 12-gauge wire.
The appropriate wire size for a 25 amp breaker is typically 10 gauge wire.
For a 25 amp circuit, the appropriate wire size is typically 10 gauge wire.
The appropriate wire size for a 30 amp breaker is typically 10 gauge wire.
The appropriate wire size for a 30 amp circuit is typically 10 gauge wire.
The appropriate wire size for a 50 amp circuit is typically 6-gauge wire.
The appropriate wire size for a 60 amp circuit is typically 6-gauge wire.
The recommended wire size for a 20 amp circuit is typically 12-gauge wire.