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Why sf6 circuit breaker is mostly used in substations rather than other?
Wiki User
∙ 11y ago
Rather than where? Circuit breakers are always located in substations.
Wiki User
∙ 11y ago
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If you have a circuit breaker box containing 650 amps of circuit breakers it is 3 phase 480 volts what size kva generator do you need?
The question isn't the number of amps total on your branch circuits, but rather, what your MAIN breaker(s) are rated at. This will determine what size of generator you will need. And be certain that the generator is 3-phase. <<>> The formula you are looking for is Amps = kva x 1000/1.73 x voltage.
Why you close generator breaker when synchroscope needle position is between 11 and 12?
so that the incoming generator will not act as load but rather a source that can synch in less time
Are fuses and circuit breakers designed in a way to protect people from shocks?
No. Well, not directly anyway. Fuses and circuit breakers are designed to protect electrical equipment, not persons, from damage due to overcurrents (overload currents or fault currents). By disconnecting such equipment, they are rendered safe. But the level of overcurrent that will trip a circuit breaker or cause a fuse to operate is usually significantly higher than the current that will cause electrocution. Anyone relying on a fuse of circuit breaker for personal protection is likely to be dead before that protective device operates!To protect people, there are special devices called 'residual current devices' (UK terminology) or 'ground-fault interrupters' (North-American terminology) which will quickly disconnect at very low values of currents -below those which will cause electrocution. Such devices or, rather, their features are sometimes incorporated into circuit breakers so that such circuit breakers will protect both equipment andpersons. Often, these devices supply circuits that terminate in outdoor socket outlets (receptacles), so that electrical tools, such as lawn mowers, strimmers, etc., can be used safely.For more information on how these devices are used, you should consult your country's electrical wiring regulations, as the requirements vary from country to country.
What is the purpose of auto transformer?
Helps with the starting of large electric motors.AnswerAn autotransformer is a transformer with a single winding, rather than two separate windings. It can be used as a step-up or as a step-down transformer, provided there is no requirement for electrically-isolating the secondary circuit from the primary circuit.
A gauge 14 extension cord can safely carry 15 A What will happen if several appliances drawing a total current of 18 A will be connected to it?
A 14 gauge extension cord can safely carry 15 amps, but not very far. Number 14 gauge extension cords are only rated for about 13 amps according to the labels on the cord. This is because the insulation is not intended to withstand the heat of currents above this level. Running this cord over 50 feet or loading it to 18 amps would be unacceptable.The likelihood of the cord maintaining the 18 amps for any amount of time for the high current to do any damage to the insulation of the cord is not very great. Extension cords are only an extension of the 15 amp wall circuit that they are plugged into. On overloading the extension cord by that amount the overload will trip the 15 amp supply breaker. An example of this is jamming a circular handsaw when it is plugged into the end of a 50 foot extension cord. The next action that is taken is to reset the tripped breaker.
Why are two 30amps breaker together?
They are in tandem because they power a 220 VAC circuit, rather then a 110 VAC circuit.
What is different Circuit Breker And Isolater?
I think that the questioner is asking what is the difference between an isolator and a circuit breaker.A circuit breaker is a switching device designed to interrupt a fault current.An isolator is not intended to break a live circuit but, rather, to provide a visible separation between a circuit component and live conductors.For example, isolators (or 'disconnectors' in US parlance) are located on either side of a high-voltage circuit breaker. If the circuit breaker requires maintenance, then the procedure is to:a. trip the circuit breaker.b. open the isolators on each side of the circuit breaker, so there is a visible gap between the circuit breaker and the 'hot' conductors.c. apply temporary earths (grounds) between each isolator and the circuit breaker.d. complete a 'permit to work' card.e. begin work.
Give one advantage of using a circuit breaker rather than a wire or cartridge fuse?
An electrical breaker is dual function an electrical fuse just has one purpose.
Why won't the switch on my breaker box stay on?
This is properly understood when Ohm's Law is applied: Voltage, Amperege and Resistance are correctly applied to a circuit for it's correct function. The circuit breaker acts as a protective device and trips when a correct electrical circuit does not exist. The wrong breaker may have been installed. the wrong gauge of wire may have been used, the pumps and heaters may be drawing more amps then planned for or a short circuit or loose connection are all possible faults. Contact the electrician that installed the system for resolution of the problem or an outside electrician if the problem isn't corrected. Caution: Water and Electricity should not be trusted when in close proximity.
What would cause a breaker to trip?
A breaker will keep tripping until the fault that caused it to trip is corrected. That's what it is designed to do. There's either a circuit overload or a short circuit. How fast the breaker trips can indicate how overloaded it is. If you are very close to the rating of the breaker you can actually trip it over time. If you are definitely over the breaker will usually trip instantly. If there is a short circuit you can usually tell that by how violently the breaker trips. If you have conduit you can hear the wires banging around in the pipe. A frequently tripping breaker may also be faulty and need to be replaced - breakers are designed to fail by tripping prematurely rather than by not tripping at all, as this is much safer. This is very often the case for breakers that trip at seemingly random intervals, often when very little load is being drawn.
What can cause a circuit breaker to suddenly start tripping?
If the breaker trips when nothing is turned on it could be a mouse problem. If it only trips when certain lights or appliances are turned on one of them is probably the reason.If it trips when nothing is being turned on or off something is getting hot. You should then have qualified electrician look at it. Hope this is usefull.
If you have a circuit breaker box containing 650 amps of circuit breakers it is 3 phase 480 volts what size kva generator do you need?
The question isn't the number of amps total on your branch circuits, but rather, what your MAIN breaker(s) are rated at. This will determine what size of generator you will need. And be certain that the generator is 3-phase. <<>> The formula you are looking for is Amps = kva x 1000/1.73 x voltage.
Why do the headlights on an 88 wrangler turn off after 20 minutes of driving?
Headlights are typically ran through a resetting circuit breaker rather than fuses for safety reasons. If you have added lights to your Jeep on this circuit, they may be too much of a draw. If not, you may look at replacing the breaker as a likely starting point. 20 minutes sounds like just the right amount of time for it to heat up and trip off.
Why do schools have a fuse box?
Schools have a fuse box for the same reason that any other building that is wired for electricity would have a fuse box, which is that if the electric power usage is too heavy for the wiring, rather than allowing the wires to melt and set fire to the building, the fuse will blow (or the circuit breaker will break the circuit) and turn off the power.
In a series connection if one component fails the whole circuit fails?
Yes. Open circuit. A: It depends on the failure type a short will not necessarily make an open circuit but rather a non functional circuit.
A neuronal circuit that concentrates or directs a large number of incoming impulses to a rather small number of neurons is called?
Converging circuit
Compare and contrast a circuit breaker and a fuse?
A circuit breaker is something you can reset. When the switch "trips", the position of the switch goes to the middle. To reset it, move to Off, then On.When a fuse blows, its two external contacts are no longer connected by the internal piece of fuse wire and an electrical current can no longer flow.More technical details about fusesIn all types of disposable fuse, two contacts which are on the body of the fuse are connected to a piece of fuse wire inside. The material used to make the fuse wire, and its thickness, designed to melt - and thus break the circuit - if the current flowing through it exceeds a certain amperage, which is known as the fuse's "maximum rated current".There are many different types of disposable fuse: some are screwed into what looks like a light bulb socket.Other types are small tubes - made of glass or ceramic - with a metal contact at each end. They are held in a fuse holder that has contacts, clips or springs which make contact with each of the fuse's end contacts.Some commonly used automotive fuses are made of plastic and have two flat metal "pins" which plug into a pair of contacts in the fuse box.
