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Electrical Wiring Homewiring Wire Shared Neutral

Common or Shared Neutral - YouTube
Feb 21, 2017Where two electrical circuits share the same neutral wire, must have a common trip and be fed from opposite phases Household sharing included. No thanks Try it
electrical - Can two circuits share a neutral? - Home
A multi-wire branch circuit (two hots from different phases sharing 1 neutral) is often found in the kitchen where it powers one receptacle which has the jumper connecting the upper and lower outets removed.A multi-wire branch circuit (two hots from different phases sharing 1 neutral) is often found in the kitchen where it powers one receptacle which has the jumper connecting the upper and lower outets removed. The result is that you get two 15amps circuits at one receptacle. At the panel, both breakers should be bonded together so it is not possible to have one on and one off. Code varies by region, but I do not think it is typically permitted in any other configuration. There are also restrictions for having multiple circuits in a single junction box. Be careful working on this - even if the breaker is off, check for voltage with a non-contact tester to ensure there are no other live circuits.Best answer · 5Only if it is a split 220 volt circuit as Steven points out and it It must be on a two pole circuit breaker. This ensures that the circuit is two different legs and not just one, also the entire circuit will be disabled with only one breaker. Each hot leg returns on this shared neutral. The reasoning is that no more than the rated (breaker) current will pass through the neutral in this configuration. The two "Hot" legs will tend to balance the return current. Example: If both legs draw 5A, then no return current passes through the neutral. If leg 1 draws 3A and leg 2 draws 10A then the difference, 7A is returned through the neutral. It is NOT permitted to share a neutral in any other situation. If you were to share a neutral with two breakers on the same leg of a panel, both circuits could draw the breaker limit (lets say 15A) making the shared neutral as much as 30A return current! That will exceed the limit of the wire size and could cause a fire. Also, GFCI and AFCI breakers will not work on a shared neutral circuit.7The "Edison 3 wire" circuit has been used for many years. 240 volts between phases and 120 volts to a neutral that carries the unbalanced load of the two phases. On perfectly balanced loads there will be no amperage on the neutral. It is imperative to have the circuit wires on different phases, i.e. 240 volts across them.1It depends -- how old is the house? Old houses (presumably, wired per the existing code at the time) are sometimes found to be wired this way (i.e., with a shared return leg). Legs L1 and L2 are each fused (or breakered) and share a return leg as far as the first junction box. Thereafter Leg L1 and a neutral branch one way, and Leg L2 and a neutral branch the other. This was done to save copper and reduce then number of cables needed. Three points: In newer houses The two circuits must be on a double pole breaker for the smallest gauge wire used in the two circuits (e.g., 14 Ga. ==> 15 amps)In older houses code did not require the double pole or handle tie breakers. The two breakers should be ganged together, so that if one trips, both will trip, and all junction boxes in the circuits become deenergized. The two hot leads from the power panel (two black, or one black one red) MUST be wired to opposite legs (one to L1, the other to L2). Failure to do this (i.e., if they are both wired to the same phase) results in DOUBLE the current running in the common Or neutral conductor, and could cause an electrical fire.1Bottom line is you can share a neutral if the two hot wires are on different phases and the breakers are locked together0You can share up to 3 circuits using 1 neutral but the 3 circuit breakers must be tied together with a breaker bridge so when 1 tries or 1 is turned off they all are off with no chance of getting bit by the neutral0If two separate circuits fed from separate supply lines share a neutral, the main danger is when the neutral becomes disconnected. If this happens, voltage will dramatically increase on the circuits. The reason is the current will flow between the lines by going through whatever loads are connected. In essence, your appliances become a series circuit between the supply lines (In U.S. split phase/single phase systems this means going from 120 to 240 volts). Fires, fried appliances, or worse is the result. This is why the NEC does not allow this once common practice. If the two circuits are from the same line, the main danger is overloading the neutral with too much current. A fire hazard as the neutral is not connected to a breaker. In short, stay safe and run separate neutrals for each circuit.you definitely do not want to share neutrals from different circuits. This sets up a potential shock hazard if one circuit breaker is open and the other closed. If you assume one circuit is dead by opening the breaker the neutral on that circuit will immediately be energized if any appliance is using the second circuit. If you are doing work on the first circuit and get across neutral and ground you could be electrocuted if an appliance or a light is energized on the second circuit.electrical - Can a GFCI receptacle share the neutral wireCan I share the neutral in 12/3 cable between two GFISee more results
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