A ground wire is a wire that is literally connected to the earth. This wire acts as a backup wire in case a neutral wire fails. Without a ground wire, the risk of electrical shock becomes a viable possibility. Ground wires are usually green or yellow in color in order to differentiate between neutral wires and hot wires. Thus, it is easy to discern a ground wire from other wires.

Each electrical circuit inside of a home has two types of wire: hot and neutral. Black wires are known as "hot" wires, and these wires carry electrical currents; hot wires may also be red in color. White wires carry electrical currents away from a device, and these wires are known as neutral wires.

When a white wire is broken, stray current is no longer carried away from a device, and neutralization is not possible without the help of a ground wire. In most instances, a ground wire is connected to a circuit breaker. When a neutral wire is no longer functional, the ground wire will trip the corresponding circuit breaker. When a circuit breaker has been activated, any electrical current is immediately stopped.

Appliances will operate normally without the help of ground wires. In fact, if a grounded wire is broken or missing, most people will not be able to tell the difference. If a large amount of high voltage has come in contact with the appliance, however, a person using that appliance may gain a hefty electrical shock. Therefore, it is important that all appliances include a grounded wire.

Ground wires are, essentially, a type of insurance. When a neutral wire does not function, a grounded wire will ensure that an appliance does not give off a dangerous electrical shock. In addition to ground wires, all homes should included proper circuit breakers. Breakers and ground wires are easily comparable, since both devices prevent hazardous shocks.

When purchasing a home, it is crucial to ask a home inspector, or electrician, to inspect a home's electrical network. While some homes may appear to be in good condition, faulty wiring can lead to shock and fires. Nearly every country has an electrical standard set in place that all homeowners must adhere to. These standards exist in order to prevent unnecessary fires and other incidents. In most cases, a home that is not up to code will not contain a circuit breaker box or ground wires.