Sharing a ground wire between circuits may work from an electrical standpoint, but may not be permitted by local electrical codes. It is unwise to install electrical circuits that do not comply with local codes. It’s illegal, dangerous, and can cause problems with insurance claims.
Can Two Circuits Share a Neutral and Ground?
Sharing a neutral wire between circuits is allowed, but is not permitted by the National Electrical Code (NEC). Neutral wires can be shared between circuits with the help of two circuit breakers in the same run of the panel. However, this causes both circuits to push the circuit breaker to its limit.
If a breaker without a common neutral has a 20A limit, the same breaker can have a reverse current of up to 40A with a common neutral, which is unsafe and an overload hazard. For safety reasons, single-phase systems should use one neutral wire per circuit.
Can Electric Circuits Have Multiple Grounds?
Technically, more than one ground can be used to link an electrical circuit. This is not standard practice to wire an electrical system that way, though. To lessen the electrical “noise” in the system, analog and digital circuits that are mixed together must have separate grounding.
Multiple grounds are possible in an electrical circuit, but this is not an option for your home electrical system. Your home shouldn’t have any different settings for any courses. Again, just because something is scientifically feasible doesn’t imply it should be done.
Code of Standards
Electrical work around your home can be complicated and you need to negotiate minefields to stay within the code of standards that apply in your area. When it comes to electrical work, electrical connections that may work from a technical point of view may not be legal from a normative point of view. Because the regulations take into account not only what works, but also what is safe in terms of electrical shock and fire safety.
Why Do We Need a Ground Wire in the Circuit?
The ground wire is the safety wire in the circuit. The circuit consists of 3 wires. There is a hot wire that carries the active voltage to the load, a neutral wire, current from the load to the positive charge on the service panel, and a ground wire that connects to earth.
The earth (ground) is negatively charged. Therefore, a positive charge always flows there to neutralize and maintain the charge difference. For this reason, the ground wire is directly connected to earth. In the event of an electrical surge, if your home’s electrical system is receiving more current than it can handle, the excess current will be shunted out of the system to other materials in your home, finding the path of least resistance to ground. Extreme weather conditions, such as lightning, can cause electric shock. If the circuit is grounded, the ground wire safely grounds excess current.
Is Ground the Same as Neutral?
No, the ground wire is not the same as the neutral wire. The neutral wire is part of the standard circuit. This is the path that returns the current supplied from the hot wire to the load (electrical appliance). Unlike the ground wire, the neutral wire is not a safety feature.
For safety reasons, the ground wire is specially inserted into the circuit. There is no problem in terms of circuit functionality. The ground wire is the fuse in the home electrical system and prevents damage caused by overloads and circuit malfunctions. The ground wire is usually a bare wire. When separated, they are green or yellow. The neutral wire is white.
Though it is common practice to share two circuits with one ground, but whether you should do so depends on your local NEC regulations. The electrician you will hire knows the rules to follow.