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Tester k 73 73 gold badges silver badges bronze badges. Note: V in the US is split-phase and doesn't use the V neutral. Add a comment. Active Oldest Votes. Improve this answer. Tester Tester k 73 73 gold badges silver badges bronze badges. Does this mean you can run a 3 phase motor using v by connecting only two of the legs? If you only connect two of the legs, you'll only have a single phase. I am asking because I read an article stating that V in the US consists of two phases.
It didn't sound right to me, which is why I asked the question. In reality, it's a single split-phase system. It has a single V circuit, with a center tapped neutral. Show 1 more comment. Why would you need that many breakers in the kitchen? If two of these together exceed the breaker limit, then each outlet requires its own breaker. What is this, some industrial kitchen that four breakers aren't enough and you've got to split the outlets as well? Ceaser Oreo Ceaser Oreo 1 1 silver badge 5 5 bronze badges.
The choice of where to tie the system to ground is arbitrary and does not need to even be done. Harper - Reinstate Monica Harper - Reinstate Monica k 17 17 gold badges silver badges bronze badges. Grounds were never around in homes outlets until after the 's ground is an escape ramp for errant voltage to use rather than use our bodies! The part about earth and dirt is completely incorrect. The grounding electrode system in a home has nothing to do with fault clearing.
Says this clearly in the NEC. Besides, current is NOT seeking ground or earth, it is seeking it's source. You completely ruined a decent answer with this edit. Wouldn't a three phase device require three hots, L1-L2-L3? Single phase means there is only one sign wave. The phase types are known as Y or delta. With a Y you have a center that serves as a "return" to carry any "out of balance" condition.
It is normally used for high voltage power lines you will see 3 heavy cables and a light cable. With Delta you will only see 3 wires. Featured on Meta. Now live: A fully responsive profile. Version labels for answers. If you're getting rid of the receptacle, you should cap off the grounded neutral conductor in the switch box.
Neutral : The white wire is called the neutral wire. It provides the return path for the current provided by the hot wire. Khurshid Billevich Pundit. What happens if neutral wire is not connected? The neutral conductor is connected to earth ground at the point of supply, and equipment cases are connected to the neutral. The danger exists that a broken neutral connection will allow all the equipment cases to rise to a dangerous voltage if any leakage or insulation fault exists in any equipment.
Alvaro Juanals Pundit. Why there is no current in neutral wire? The answer is: In a WYE 4 wire system the neutral , in theory, carries only the difference of current flow between the 3 phase conductors.
So, when the current in phase A, B and C are equal, then there is no current flow in the neutral. Non-linear loads cause harmonics , some of which will add up on the neutral. Sergej Tuschl Teacher. What is the difference between a 3 prong and 4 prong dryer cord? The key difference in the wiring configuration between 3 - prong and 4 - prong cords is that with the older setup, the 3 - prong cord has only two hot wires and one neutral wire—there is no separate ground wire.
Therefore, the dryer's neutral was tied to the ground connection on the metal case of the dryer. Quentin Wasserthal Teacher. Is 10 3 wire heavy enough for a dryer? Decebal Eleiciaga Supporter. Why does my neutral wire have voltage? Because the resistance of the copper neutral wire is usually very near zero, this also keeps the voltage low.
However, if the neutral wire is damaged or has a high impedance fault like a corroded connection, the voltage in the neutral can increase to a dangerous level at some point out in the branch circuit. Kheireddine Poshehonov Beginner. What happens if you switch live and neutral? If you 've swapped the live and neutral wires then even with the switch off all of the wires and load inside the appliance are energized so it's much easier to get shocked.
If it's wired correctly then the screw shell will be on the neutral side, so safe if you accidentally touch it. Atiqa Shaje Beginner.
What happens if earth and neutral wires touch? If you have a ground fault circuit interrupter GFCI , then connecting neutral and ground will fault the circuit. Ergo, the chassis of the appliance will not be at ground potential. For an individual to get zapped when a dryer or range chassis is connected to both neutral and ground, there would have to be a very large voltage drop or an open wire condition on both the neutral and the ground wire.
Not a likely scenario. In any event, my main point was that manufacturers are not being too emphatic about pulling the bussbar. To quote a recent manual that I have here: "if local codes prohibit grounding through the neutral, disconnect the factory installed bussbar". On the other hand, they spent a full page extolling the virtues of the "anti-tip device". Actually a steady mA will kill you. A very brief 1 A will kill you, or make you're heart stop or make it do something that isn't good for you.
Brian -- Brian Denheyer bri Death by electrocution can be caused by as little as 1 millamp if it passes through the heart. However, the human body offers a skin resistance of several megohms under normal conditions not including standing dripping wet on a concrete floor in bare feet - for example.
It does take quite a bit of voltage to push a lethal current thru the human body. Ever see anyone get electrocuted by touching the output of a 24 VAC bell transformer, which can put out several amps??? Only once have I seen a house wiring neutral float more than 20 volts above ground.
In that case, there was a corroded ground connection at the service entrance and the house wiring load was severely unbalanced between phases. Trouble is, the 3,, ohm resistance is very misleading.
Make it million or more. If you touched something and put yourself in parallel with a 1 ohm fault path, the net resistance will always be less than 1 ohm! So if volts is needed to force a milliamp into the heart, does that mean you're safe at anything under amps? Gary: If you're talking about the service entrance, then you get 2 hots and a neutral, not a ground.
The ground and neutral should be bonded at the service entrance. The ground is then run separately from the neutral to all grounded outlets. After the , this practice has been disalowed.
You must run 4 wires for these. The reason for a neutral is because there is usually control circuitry in the appliances for clock, timer, thermostat, etc. Motors on the other hand are allowed to have 2 hots and a ground, with the ground never conducting except when a fault occurs. So, in my home, my Volt dryer should be 4 wires, but my Volt table saw should only have 3. Why no neutral with V wiring? Gary Watts. Reply to author. Report message as abuse. Show original message. Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message.
Obviously a regular V single phase home wiring has a hot, netural and a ground. Yet, in the same wiring, V applications have 2 hots, a ground a and no netural. Mike J Oropeza. Greg Fretwell. On a v circuit you only need a neutral if there are v loads. If it is a "pure" v load there would be no purpose for the neutral but you still need the Equipment Grounding Conductor for safety reasons. There was an aberration in the National Electric Code since the copper rationing of WWII that allowed ranges and driers to share the ground and neutral only providing a 3 prong plug even if they had a neutral load.
The NFPA finally figured out the war was over in and made that exception go away. Now you need a 4 prong plug on new construction and renovation. BTW some local codes have required a 4 wire feeder to these receptacles for years so this might not be the problem it seems. The ground went to the box with the white wire going to the 3d prong of the receptacle. Sam Goldwasser. Robert Hancock.
You're right, it is. However the reason is that it provides a path for fault current that does not normally carry current itself. If you used the same wire for the neutral and case ground then if the neutral became disconnected and you turned the device on then the case would become live.
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