So that you will know it is the earth ground wire and not the neutral wire or the hot wire. The neutral white wire is not necessarily connected to the same place as the earth ground wire. It is also bare because it does not matter if it touches a metal exterior since it is supposed to be connected to that anyway for safety. Both the neutral white wire and the hot black wire are insulated so they will not normally short to the bare ground wire.
A ground wire can be bare because it is not a current carrying conductor. It is at the same potential as all the rest of the metallic conductive objects that make up the electrical system that the ground wire is grounding.
For the same reason that the majority of all electrical wiring is done with copper wire. It is a good conductor of electricity and the mineral is readily available at a lower cost of production than other conductive materials.
Ground wire to neutral wire.
A 200 amp service panel will require a # 4 bare copper ground wire.
The ground wire in a two or three conductor #12 cable is a #14 bare ground wire.
Yes, as long as it is the same size wire or larger as the hot and neutral wires.
It just means that the bare wire is insulated by a non-conducting coating. In home wiring the typical circuit has a black wire (Hot), a white wire (Neutral) and a bare wire which is ground.
A ground wire can be bare because it is not a current carrying conductor. It is at the same potential as all the rest of the metallic conductive objects that make up the electrical system that the ground wire is grounding.
If you mean a bare copper wire, that is the "ground" wire.
Ground wire to neutral wire.
Could have a short in your wire, a bare wire touching bare metal could cause it to ground out.
Yes, if it is not an insulated wire. If it is bare copper it is always ground. But the hot and neutral wire are also copper, they are just insulated.
you can ground it right to the frame. just find a bare spot and put a screw with the ground wire
A 200 amp service panel will require a # 4 bare copper ground wire.
The ground wire in a two or three conductor #12 cable is a #14 bare ground wire.
the bare copper is always a ground
No, you can use #4 bare copper ground wire.
Yes, as long as it is the same size wire or larger as the hot and neutral wires.
It just means that the bare wire is insulated by a non-conducting coating. In home wiring the typical circuit has a black wire (Hot), a white wire (Neutral) and a bare wire which is ground.