The correct answer is A. 2.
The ground wire is an important safety feature in electrical wiring. It provides a path for current to flow in the event of a short circuit, preventing the build-up of dangerous voltage. The ground wire must be able to carry the current that would flow in a short circuit, so it must be made of a material that is good at conducting electricity. Copper is a good conductor of electricity, so it is the material that is typically used for ground wires.
The National Electrical Code (NEC) specifies the minimum size of ground wires for different types of electrical wiring. For most types of wiring, the ground wire must be at least No. 2 copper. This means that the wire must have a diameter of at least 0.083 inches.
It is important to use the correct size ground wire for your electrical wiring. Using a wire that is too small can create a fire hazard. If you are not sure what size ground wire you need, consult the NEC or a qualified electrician.
Here is a brief explanation of each option:
- Option A: No. 2 copper is the minimum size ground wire required by the NEC for most types of electrical wiring.
- Option B: No. 4 copper is a larger size ground wire that can be used in some cases.
- Option C: No. 6 copper is an even larger size ground wire that is rarely used.
- Option D: No. 10 copper is the largest size ground wire that is typically used.