+- THE RIGHT DESCRIPTION SHOULD BE INTERCHANGED TERMINATION NOT BACKWARDS.
Reversed polarity in ac wiring is when the hot and neutral are reversed.
the hot and neutral are wired forwards the ground and neutral are wired backwards
I am getting ready to take a inspectors test. and one of the things we have to do is look up some of the questions online did you get the answer to this one?
For safety sake, please do not attempt the above for real. Please don't cross wires. For connections, live should go to live; neutral to neutral; and ground to ground. No exception. The hot wire carries the AC signal, which reverses polarity every 1/120 of a second. Please refer to the related links. ==============================
I know the answer, but I'm not taking this test, you are! Study your book and learn the answer yourself. Believe me, I'm doing you a favor.
no, backwards walkovers are easiest however some people may learn a back handspring first therefor for them the back handspring would be easier...... isn't a back handspring just a flick??
Voltage on ground can mean an open ground. It can also mean (high) current on ground, due to a ground fault such as reversed neutral and ground.
If you are talking about an AC (alternating current) circuit, such as the house mains supply, "reverse polarity" usually means the "hot" and "neutral" wires from the supply have been connected to something the opposite way round to what they should be. If you are talking about a DC (direct current) circuit supplied by a battery, such as in a car, "reverse polarity" usually means the positive and negative leads from the battery have been connected to something the opposite way round to what they should be.
Because if you reversed the polarity at the battery it would blow the fuse through which current flows to the drain.
no, you ground the neutral
There is an open circuit on neutral. You should have power between hot and neutral, as well as between hot and ground. Note well, however, that you should not pull any power between hot and ground, because ground is not intended to be a current carrying conductor - it is only there as a protective earth ground in the case of fault. You can not easily tell, at the outlet, if neutral and ground is reversed - you need to pull a load and then double check with a clamp on ammeter at the distribution panel.
The danger of a 120V socket with reversed polarity is that some appliances are designed to minimized the chance of a user coming into contact with the hot terminal of the line. This is done by polarizing the plug, making one blade wider than the other, the narrow blade being hot. In a lamp fixture, for instance, the hot side would connect to the center pin, while the neutral side would connect to the shell. The user reaching in to unscrew or screw in the bulb might touch the shell, but if that is neutral and not hot, the risk is minimized.Another example of reversed polarity is reversed neutral and ground, which is dangerous because the ground conductor is not insulated and is therefore not rated to carry operating current.Even more dangerous, is reversed hot and ground, which would electrify the frame of an appliance, creating an electrocution hazard.Any electrician making one of these types of wiring errors should go to jail, and at minimum, should lose their license. Any non-electrician making one of these types of wiring errors may have to learn to hard way, such as by killing someone, that things electrical are best left to licensed electricians. By the way, in most US jurisdictions, if a wiring error causes a fire, the fire marshal will report that to the insurance company and the insurance company will revoke the fire insurance on the dwelling - that should make anyone stop and think about what they are doing.
I will assume that your question is in reference to CT and transformer polarity.In the case of a CT (Current Transformer) they have to be installed in the correct direction for proper metering. The polarity check is used to verify that they are installed correctly and that the polarity marks are correct (if the CT has them).In the case of a transformer there are two types of polarity, additive and subtractive. If you are paralleling transformers you have to ensure that they are the same type polarity in addition to other attributes.Hope this helps.Alternative AnswerIn a new electrical installation, a polarity test is conducted to ensure that socket outlet terminals are correctly wired (line really is line, neutral really is neutral, and the protective conductor (earth/ground) really is protective conductor. It's also important, for example, that the centre pin on an Edison Screw lampholder is connected to line, and not to neutral.
The ground wire and neutral wire are not the same.
Ideally ground and neutral should be at the same potential, but as there is current in the neutral wire and no current (normally) in the ground wire there can be a difference. I have personally measured over 25 VAC on the neutral relative to ground in some systems.
reverse polarity is wiring. This is hot wiring from an outlet.Another AnswerIf you ignore the protective (earth/ground) terminal, there are two 'live' terminals at a socket outlet (receptacle) -the line terminal and the neutral terminal . The 'neutral' terminal is roughly at earth (ground) potential, while the 'line' terminal is at a potential of 230 V (Europe) or 120 V (North America) with respect to the neutral terminal.It's very important that the line terminal is protected by a fuse or circuit breaker at the main panel, while fuses/circuit breakers must never be inserted into the neutral.If the terminal has been wired the wrong way around, i.e. the 'line terminal' has been wired to the neutral, and the 'neutral terminal' has been wired to the line, then it is potentially very hazardous, and it is described as having 'reverse polarity'.The problem with reverse polarity is particularly evident with Edison-screw lamps, where it is VERY important that the centre terminal is connected to the line and the surrounding (female) screw thread is connected to the neutral. If the lamp is connected with 'reverse polarity', it's possible to receive a shock from the lamp's thread while it is being inserted or removed from its mount. This is one reason why 'bayonet' fitting lamps are preferred in the UK, where polarity is unimportant, as access to a line terminal is impossible.
For a US 3-prong plug, a smaller slot should be hot, the longer slot should be neutral, and the screw that holds the plate on should be ground. Cheap, inexpensive testers are available at hardware stores.
The neutral of a transformer is usually grounded. Under this situation, this question is the same as asking whether you can apply a voltage to ground; the answer is yes, but I don't know why you'd want to. Sometimes transformer neutrals are insulated away from ground. If this is done, then you could inject "backwards" from the neutral up into the transformer. Again, I don't know why you would want to do this, though.
Neutral Ground Resistor is using for minimizing the fault current of system. It is a resistor which connected between ground and neutral and increase the resisting path for fault current.
A neutral grounding reactor is a reactor that is placed between equipment neutral and ground. These are often used to ground generators to limit ground fault current.
Most technical people believe that AC electricity is not polarized this is an incorrect assumption. Since AC power is just a potential difference between some reference (ground) and a signal it stands to reason reversing the Neutral and the "Hot" should reverse the polarity.
A -dim- "hot/neutral reversed" indication means that there is -some- voltage, but less than 120V, on the neutral line, referenced to the safety ground. Ideally, the ground and neutral should be at the -same- potential, but a loose neutral connection "upstream" of this outlet will cause measurable voltage between ground and neutral. No need to swap any wires; just tighten neutral connections at all points (including outlets AND breaker panel) on the same circuit as this outlet. My guess is that whoever pulled the wire swapped the white/black wires from the point prior. Trace back the wire to the previous outlet and check the hook up. Try to swap your white/black line on the outlet and retest. If it checks ok, then the wire have been swapped from the previous point.
Neutral is connected to ground at the distribution panel, and no where else. Any current flowing on ground downstream of the panel is considered a ground fault.
Circuit breaker tripping, or non functioning outlet. The neutral and hot can be reversed, or an open ground, and you will have no symptoms. This can only be detected with a circuit tester you plug in to check the wiring.