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The test is, push the button, if the breaker trips, tested ok, if not,the breaker is bad,(rare)
or if it does not reset, somewhere in the house, hot is connecting to neutral. Bad outlet or even light fixture.
Arc-fault are used in bedrooms. Codes in most areas. These are in case the kids stick a fork into an outlet.
Ground fault is used near water.
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What is advantage of digital relays?
They can be used as a kind of safety switch to allow a circuit with a small current through to switch on a circuit that will hve a larger current flowing through it.
What trouble that exist in parallel circuit if one of the load in parallel circuit is shorted?
when loads are connected in parallel it means that they share common nodes at both the ends i-e voltage across all the loads is the same. when one of the load in such a circuit is shorted i-e its voltage is made zero volts, voltage across the other loads goes to zero because of parallel connection and they gets shorted also.
What is bad about a series circuit?
In something like a lighting circuit, there are a couple of disadvantages to a series circuit. The first and most important is that all of the devices in the circuit must work. If you've ever dealt with Christmas tree lights you've seen the ones where one burned-out bulb kills the whole string. Second, the more bulbs in the circuit, the dimmer each one gets. But I think the worst one would be: you can't turn off any of the lights. If you turned one off, they'd all go out UNLESS you used a double-throw switch and a whole lot more wire so you could bypass any bulb you wanted to turn off. And when you did it, the lights that were still on would get brighter.One of the disadvantage of a series circuit is in trouble shooting, you have to check ALL the loads of the circuit. Christmas light is the best example.No advantage it is just a different What_are_the_disadvantages_in_using_a_series_circuitabove sample is lame because it will take as much time to find to open circuit in a parallel circuit.In a series circuit, all components receive current in a row, and if the circuit through one is broken then none of the others can receive it.In a series circuit any discontinuity of current flow will interrupt the rest of the circuit to operate.*the more components the circuit has, the greater its resistance is.*if just one component doesn't work, it opens the whole circuit.i lay on the groudn and pretend im a carrot sometimes.
What is the difference between an arc fault breaker and and a ground fault breaker?
A ground fault circuit interrupter is as its name implies, a device (circuit breaker or special receptacle) which interrupts (shuts down) a circuit when it detects a ground fault (current flowing to ground). When a small amount of current (4 to 6 milliamperes) is detected flowing to ground by the electronics within the device it trips so that no more current can flow, thereby possibly saving your life. Example: you are listening to the radio while having a bath and it falls into the tub--- the circuit will turn off before you can be harmed. GFCI's as they are commonly called are required by the Electrical Code to be installed in bathrooms, kitchens where the receptacle is within one meter of the sink, any outdoor location (rain and snow) and any other wet or damp locations. (refer to code book) An Arc Fault Circuit Interrupter is a device( I've seem breakers but am unsure whether there is a special AFCI receptacle) which shuts off a circuit when it detects an arcing condition in the circuit. An example of arcing would be when you pull the plug out of a wall receptacle when the device plugged in is under load (turned on) and you see a little (sometimes big depending on the size of the load) bluish or yellowish flash or "arc". Receptacles on AFCI circuit breakers are required by the electrical code to be installed in bedrooms. It has something to do with the flammability of linens and blankets I believe, but here again for detailed info please consult the official Electrical Code book for your location.
What does 'cross phase' mean for a 3-phase electrical supply?
The following is pretty colorful but in reality you will see nothing as the safety equipment stipulated by the electrical code trips the circuit open before any serious damage is done. On a circuit that has tripped on a ground or phase fault the first thing to be done is isolate the circuit using lock out procedure. The trouble shooting equipment used is a megger. Once the fault is located and repaired, the circuit is re fused or the breaker reset, power turned on and an amperage reading is taken. If all the equipment is within the manufactures specifications the circuit is signed of as operational. To quote Billy Mays "KABOOM!". For any two or more phases to make mechanical contact in a three phase electrical system creates the ultimate dead short. This results in an immediate explosion with an arc flash brighter than the surface of the sun and a complete meltdown of the conductors and equipment. Simply put, you don't want to cross phases or allow them to make contact in any single or three phase system. This is the worst thing any electrician can do.
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