In any other scenario, it is not authorized to share a neutral. If you shared a neutral with two breakers on the same leg of a panel, both circuits may draw the breaker limit (say, 15A), causing the shared neutral to have up to 30A return current! This could cause damage to your wiring or circuit components.
The answer is no. Only one hot wire can be connected to a single neutral conductor. When you connect both ends of another wire to two different terminals, they become a second hot wire that cannot be used for anything else. It will not work as a ground, and it will not function as a third hot either. These are all unsafe conditions that could cause fire or electrocution.
When you use multiple wires from one cable to service separate loads, each load requires its own conductive path from the power source to its destination. A single shared neutral violates this principle; therefore, it is not permitted. For example: Let's say you have a washer/dryer pair that needs electricity to run their motors. They cannot share a hot because then only one of the machines would get power when you turn on the switch. Instead, each machine gets its own hot from the panel. A shared neutral is also not recommended if you are using appliances that have motors, such as air conditioners, heat pumps, and refrigerators.
When using one neutral with two circuits, you risk exceeding the capacity of the conductor and damaging it. If the two circuits are connected to the same line, the major hazard is that too much current would overload the neutral. Because the neutral is not linked to a breaker, there is a fire risk. This type of setup is called a "shared neutral" system.
The term "neutral" refers to the third wire in an electrical system. The other two wires (hot and ground) are used to carry voltage from terminal to terminal on a circuit board or house wall. Neutral passes current to all parts of a building equally; therefore, it should be as large as possible within reason. The term "third wire" means that if you were to connect any two wires together they would form a path around which current could flow. In a three-wire system, all three wires are available for use as pathways for current.
In a residential setting, electricity must be brought into each home through a meter located in a convenient location such as the garage or basement. This service panel is called a "metered entrance." Heating and air conditioning systems also need to be metered for energy usage. These devices produce more electricity during cold months and less during warm months. Having a record of this usage allows the homeowner to be billed accordingly.
Electricity is transmitted to homes over long distances by means of power lines.
Neutral wires from separate circuits are not connected except at the panel's neutral bus. Current flows via neutral wires. If you connect neutral wires from separate circuits, you risk overloading the neutral line, which might result in a fire. Before you connect any wires, be sure that you know which wires are which circuit's neutrals.
If you're lucky enough to have wire nuts, that's ideal. Otherwise, you'll need cable ties or rope for temporary fixes. Be careful not to cross-connect electrical circuits, which could cause serious damage to your home and not be obvious until it is too late. Follow proper wiring practices to be sure you haven't done so already. Neutral connections should always be inside walls and should never be exposed.
The National Electric Code requires that all black and white wires be contained within either a breaker or a fuse box. The term "breaker" means a device that opens when it detects an overload on a conductor It will not open if a short circuit exists on a conductor. A "fuse" is a device that breaks when it experiences an overload or a short circuit. It will not break if only a ground fault occurs on a conductor. The term "grounded conductor" means a conductor that has been bonded to the metal frame of a house or office building. The bonding material can be tape, rubber, or copper and must be continuous throughout its length.
Electricity has numerous return channels when the neutral wires of two or more distinct circuits are linked at a point other than the main panel, resulting in net currents. This can result in risks such as fire, shock, and magnetic fields. The connection should be made by a qualified professional.
The link between the neutrals is called a "ground". It serves to connect all the metal parts of a house together so that any current flowing into one part of the house is equal to current flowing into another part. If you look around your home, you will see that almost everything has a ground - the electric meter, the water pipe, the phone line, etc. This is important because without connecting the neutrals it would not be possible to maintain equality among the currents on different parts of the circuit. For example, if you were to open a tap on one end of the house while leaving the other end open, there would be no way to make sure that all the water coming out of each fixture is exactly the same amount. One fixture might have too much water pressure so that it bursts its tank, while another might have too little water pressure so that it fails to function properly. With neutral links, however, this problem does not arise because every room is given an equal opportunity to receive electricity from the breaker box.
A neutral link is a dangerous thing to do yourself.