Circuit Breaker Diagram
Posted by admin in Circuit Breakers Work on January 10, 2012
Circuit Breaker Diagram is very essential to be designed for an electrical panel,it has got many important reasons for that. These reasons are such as replacement,for circuitry understanding,repair,upgrading etc. That’s why circuit breaker diagram is very essential for every home.
If you have an electrical panel box in your home then it should have a wire diagram for circuit breaker panel. This diagram will help you to know that which particular breaker is at which number in the panel. The panel door will have a piece of paper with the numbers and lines. The each corresponding number on the panel will tell you that which electrical outlet in your home is connected to which breaker in your panel. In such a way when you want to know that your which equipment is connected to which specific breaker, this circuit breaker diagram will help you out.This is very important for you to know which breaker goes to which outlet because if there a short circuit takes place in the breaker or you got a bad outlet in your home, you will definitely going to face some hard time figuring out exactly which breaker needs to be repaired or replaced.
It becomes much more important when breaker trips or any other electrical problem occurs in a home to know which breaker is connected to which outlet. It helps you to shut down the electricity of a specific part of your home during earth leakage. If you don’t exactly know about that which breaker is connected to which outlet,then it can take you hours to figure out. You might even have to shut the electricity off to the entire home by shutting down the main switch. Shutting down the electricity to the entire home may not be an option, especially if the panel is for a business place.
It is almost impossible to replace a circuit breaker without a diagram. It is easy to find out the tripped breaker inside the panel just by spotting a breaker which is not in an ON position but without a circuit breaker diagram it is not easy to find out that a tripped breaker is for which electrical outlet. This is the only circumstance where it will not matter to you if you have the panel labeled.If still you don’t have a circuit breaker diagram for your panel, then its a time for some home up-gradation, because without this diagram you will not know which slots on your electrical panel are being used and which breaker slots are free to use for a new electrical outlet. This is important for you to know that where you can put new breakers in the panel. A wire diagram for circuit breaker panel will help you add new rooms to your home without any electrical issues.
A circuit breaker diagram is ideal when you want to perform automatic fixes on electrical problems in a home. You must have the capabilities of knowing which breaker is for which outlet. Knowing which breaker is for which outlet is important for replacing, repairing, upgrading, and other things. A diagram will help you easily understand the electrical layout of your home. This will make it easy for you or even an electrician to repair electrical issues in your home because the breakers will be instantly identifiable.
AFCI Breaker
Posted by admin in afci Breaker on November 6, 2011
The AFCI Breaker is know as “arc fault circuit interrupter”,this device is designed to prevent fires caused by arching faults.It detects a non-useful electrical arc and discontinue the power before the arc initiate a fire.
The traditional breakers can only sense overloads and and short circuit,so that mean they are not designed in a way to protect against arching conditions.An AFCI is as much censorious that it would not get tripped due to normal arcs.
The AFCI continuously monitors the current passing through it. AFCI had a unique inbuilt current sensing circuit which can easily differentiate between normal and abnormal arcing conditions,When an abnormal arching condition takes place it stimulates the inbuilt control circuit which causes the internal contacts to trip.
Now a days AFCI breakers are getting transformed into traditional circuit breakers which are available in the combination of conventional overload and short-circuit protection with arc fault protection. AFCI breakers have a test button and look similar to ground fault circuit interrupter. Some designs combine GFCI and AFCI protection.Additional AFCI design configurations are anticipated in the near future.
It is important to note that AFCI breakers are designed to reduce the effects of arcing faults but cannot eliminate them completely. In some cases, the initial arc may cause ignition prior to detection and circuit interruption by the AFCI.The AFCI circuit breaker is used for a dual purpose,it will cut off an electricity supply when an arching fault takes place and it will also trip when a short circuit or an overload occurs.The AFCI breaker provides protection for the branch circuit wiring and limited protection for power cords and extension cords. Single-pole, 15 and 20 ampere AFCI breakers are currently available.
AFCI Breaker don’t provide any specific protection against glowing connections, excess current, high line voltages or low line voltages.Excess current is protected against in all currently marketed AFCI devices that are designed to mount in circuit breaker panels, as all of these AFCI devices incorporate the function of a standard inverse-time circuit breaker and add to it the AFCI function. Glowing connections occur when relatively high electric current exists in a relatively large resistance object. Heat comes from power dissipation. This energy, when dissipated in a small junction area, can generate temperatures above 1000 degrees Celsius and can ignite most flammable materials.
Check out these videos below about “How AFCI Breaker works and why you want them in your home?” :
The 1999 edition of the National Electrical Code, the model code for electrical wiring adopted by many local jurisdictions, requires AFCI Breaker for receptacle outlets in bedrooms,effective January 1, 2002. Although the requirement is limited to only certain circuits in new residential construction, AFCI Breaker should be considered for added protection in other circuits and for existing homes as well. Older homes with aging and deteriorating wiring systems can especially benefit from the added protection of AFCI Breaker. AFCI breaker should also be considered whenever adding or upgrading a panel box while using existing branch circuit conductors.
Circuit Breaker Working
Posted by admin in Circuit Breaker Working on November 1, 2011
Here we are going to discuss about Circuit Breaker Working,we will learn here about how its different parts work together to perform a final action.So let us start with the principle basically on which circuit breaker works.
As we all know that the nature of a current is to flow through conductors,so,when a current flows through any type of conductor, it generates heat. The larger the current that flows in the conductor(wire), the more heat generated. When the current flow through a conductor it also creates a magnetic field around that conductor. This field of magnetism increases as current increases. These two basic physical principles are the key design components of the modern circuit breaker.There are many kind of circuit breakers available now a days for different types of protection as AFCI Breaker,GFCI Breaker,SF6 Circuit Breakers Etc.
What is a circuit breaker?
Circuit breakers provide a manual means of energizing and de-energizing a circuit and automatic over-current protection Unlike fuses,which must be replaced when they open,a circuit breaker can be reset once the over-current condition has been corrected A simple push of the handle to the “OFF” then back to the “ON” position restores the circuit If a circuit reopens upon reset to the “ON” position,a qualified electrician should be consulted to determine the problem .
These are the common functions which are performed by all the circuit breakers :
1. It sense when an over-current occurs.
2. It measure the amount of over-current.
3. It act by tripping the circuit breaker in a timely manner to prevent damage to itself and the associated load cables.
The Brief Description Of Circuit Breaker Working :
The circuit breakers have either a bimetallic sensor to detect the rise in heat or a coil of wire to create a magnetic field, and perhaps both. The bimetallic sensor is consist of two different metal strips sandwiched together, the two metals selected for the construction of bimetallic sensor expand at different rates.A small amount of heat is produced due to the current flowing through the strip . As the current increases so does the heat. Since the two metals are mechanically bonded together, they expand, but at different rates. Due to the different rates of expansion it causes the strip to bend. The strip is attached to a series of latches and levers. Due to the connections between strip and levers,when strip moves then it cause the lever to move too and this mechanism unlocks the spring loaded handle which then moves toward the off position opening the electrical contacts and stopping the current.
In a circuit breaker there is a magnetic sensor which is made of a wound coil of wire and a metal plate or rod placed within the coil’s magnetic field. This plate or rod is connected to the latching mechanism in a similar manner as it was connected in the bimetallic strip case. This combination of coil and plate or rod is engineered in a way so that under normal current loads the force of the magnetic field is insufficient to move the lever and unlock the handle. As current exceeds the pre-designed limits, the force of the coil increases sufficiently to move the rod or plate, operate the lever or latching mechanism which turns the circuit breaker off.
Magnetic sensor action is much faster than the heat method and protects the circuit when larger overloads are sensed, this method don’t required a time delay which might cause equipment damage or a fire hazard. Putting both methods of operation together into one circuit breaker combines the positive features of both, yielding added safety.
Now for understanding the circuit breaker working let us take an example of AC motor(See the diagram below).In the following explanation, an AC motor is connected through a circuit breaker to a voltage source. When the circuit breaker is closed, a complete path for current exists between the voltage source and the motor allowing the motor to run. Opening the circuit breaker breaks the path of current flow and the motor stops. The circuit breaker automatically opens when it senses a fault. After the fault has been cleared, the breaker can be closed, allowing the motor to operate.
Here Is A Video Tutorial On Circuit Breaker Working :
As of now you all know about circuit breaker working,and by knowing this you can understand that why this great invention called circuit breaker has replaced the fuses.It is a better way to use circuit breakers except the fuses for the good and reliable protection of your electrical appliances and complicated circuits.
Air Blast Circuit Breaker Working
Posted by admin in Circuit Breaker Working on October 29, 2011
This post is basically based on Air blast circuit breaker working,here you can find out the entire mechanism of air blast circuit breakers with the help of circuit diagram and supportive theory.
In the air blast circuit breakers the arc interruption takes place to direct a blast of air, at high pressure and velocity, to the arc. Dry and fresh air of the air blast will replace the ionized hot gases within the arc zone and the arc length is considerably increased.Consequently the arc may be interrupted at the first natural current zero. In air blast circuit breakers, the contacts are surrounded by compressed air. When the contacts are opened the compressed air is released in forced blast through the arc to the atmosphere extinguishing the arc in the process.A compressor plant is necessary to maintain high air pressure in the receiver.
The air blast circuit breakers are especially suitable for railways and arc furnaces, where the breaker operates repeatedly. Air blast circuit breakers is used for interconnected lines and important lines where rapid operation is desired. In air blast circuit breaker (also called compressed air circuit breaker) high pressure air is forced on the arc through a nozzle at the instant of contact separation. The ionized medium between the contacts is blown away by the blast of the air. After the arc extinction the chamber is filled with high pressure air, which prevents restrike. In some low capacity circuit breakers, the isolator is an integral part of the circuit breaker. The circuit breaker opens and immediately after that the isolator opens, to provide addition gap.
In the air reservoir there is a high pressure air stored between 20 to 30 kg/cm2. And that air is taken from compressed air system. On the reservoir there are three hollow insulator columns mounted with valves at their base. On the top of the hollow insulator chambers there are double arc extinguishing chambers mounted . The current carrying parts connect the three arc extinction chambers to each other in series and the pole to the neighboring equipment. since there exist a very high voltage between the conductor and the air reservoir, the entire arc extinction chamber assembly is mounted on insulators. Since there are three double arc extinction poles in series, there are six breakers per pole. Each arc extinction chamber consists of one twin fixed contact. There are two moving contacts. The moving contacts can move axially so as to open or close. Its opening or closing mechanism depends on spring pressure and air pressure.
The operation mechanism operates the rods when it gets a pneumatic or electrical signal. The valves open so as to send the high pressure air in the hollow of the insulator. The high pressure air rapidly enters the double arc extinction chamber. As the air enters into the arc extinction chamber the pressure on the moving contacts becomes more than spring pressure and it causes the contacts to be open.The contacts travel through a short distance against the spring pressure. At the end of contacts travel the part for outgoing air is closed by the moving contacts and the entire arc extinction chamber is filled with high pressure air, as the air is not allowed to go out. However, during the arcing period the air goes out through the openings and takes away the ionized air of arc.
While closing, the valve is turned so as to close connection between the hollow of the insulator and the reservoir. The valve lets the air from the hollow insulator to the atmosphere. As a result the pressure of air in the arc extinction chamber is dropped down to the atmospheric pressure and the moving contacts close over the fixed contacts by virtue of the spring pressure. the opening is fast because the air takes a negligible time to travel from the reservoir to the moving contact. The arc is extinguished within a cycle. Therefore, air blast circuit breaker is very fast in breaking the current.Closing is also fast because the pressure in the arc extinction chamber drops immediately as the value operates and the contacts close by virtue of the spring pressure.
Air Blast Circuit Breaker ratings are :
12 KV, 40 KA
22 KV, 40KA
145 KV, 40 KA, 3 cycles
245 KV, 40 KA, 50 KA, 2.5 cycles
420 KV, 40 KA, 50 KA, 63.5 KA, 2 cycles
GFCI Breaker Wiring
Posted by admin in gfci Breaker on October 7, 2011
The GFCI breaker looks unusual because of those white curly pigtail attached at there bottom.
People think where the heck does THAT go?
So,Here i have listed below all the steps of GFCI breaker wiring for your convenience,follow them step by step and accomplish your task of GFCI breaker wiring very easily.
1. First of all turn off the main breaker in the service panel and remove the panel cover. Check the circuits with your voltage tester to make sure that they are not hot. Pull out the old breaker and disconnect the wires.
2. Now second step is to verify that the GFCI breaker matches the circuit wiring. Use a 15-amp breaker with 14-gauge wire and a 20-amp breaker with 12-gauge wire.
3. Attach the curly white wire from the breaker to the neutral bus. The neutral bus is the strip with the screws located on the outside edge of the service panel.
4. Connect the white circuit wire to the neutral breaker terminal and the black circuit wire to the hot breaker terminal. No more than 1/4 inch of exposed wire should show outside the breaker.
5. Follow the breaker manufacturer’s directions for inserting the breaker into the panel. The wiring end of the breaker is usually inserted first and the other end is then pushed down until fully seated on the center tab.
6. Turn the power back on and press the “Test” button on the breaker. Reset the GFCI by pushing the switch fully off and then on.
NOTE : If the hot and neutral wires are reversed, the circuit may still test normally, but you may not have ground-fault protection. Verify that the wires are properly connected by testing an outlet on the circuit for correct polarity. A GFCI should not be used with lights, freezers, refrigerators or medical equipment. A GFCI cannot be used with appliances which are individually grounded, such as ovens or dryers.
Here is a video of GFCI Breaker Installation :
Why you need GFCI circuit breakers,Want to know??…Then watch this video :
GFCI Breaker Tripping
Posted by admin in gfci Breaker on October 3, 2011
If your GFCI breaker is tripping,then first of all you will have to insure whether your GFCI breaker always trips immediately or not.If your GFCI breaker always trips immediately then may be there is a ground fault condition,for this condition you will have to check it out your cable,connectors and motor for water penetration.If you found a leakage in the cord then this leak in the cord may be caused from cuts by rodents chewing on the cable,sharp rocks,something hitting the cord etc.Or from a leak at the quick disconnect or where the cord connects to the unit.Visually check the cord for any knicks or cuts and also look at the quick disconnect for any water contamination.(Note: water may be in the threads of the disconnect without causing damage).If there is a Motor Contamination then due to this over time the seals in the motor will wear out.This may cause a slight bit of water to contaminate the motor and oil and cause the breaker to trip.If none of the other items above seem to be the problem,the motor should checked by an Authorized repair center.If the breaker only trips when the lights try to turn on,it may indicate that no neutral wire was supplied to the control panel or the neutral wire is faulty.Make sure the neutral is supplied and is proper and sufficient.
If that water penetration is not a cause then may be your GFCI breaker is faulty.For this fault check you should have to perform the manual test on the breaker to see if it is functioning properly.If GFCI breakers are tripped many times,they tend to increase in sensitivity(or may not trip at all)and can need replacement.
Now we need to go back on the very first step where we have insured that our GFCI breaker always trips immediately.The all above explanation is for that condition when you have insured that yes my breaker always trips immediately.Now what if your GFCI breaker not always trips immediately.Okay let us move for further possibilities on this condition.
Next step is to insure whether your breaker trips randomly,if yes then it indicates Nuisance tripping.
The causes for Nuisance Tripping are Supply voltage and Unbalanced or Intermitant Loads.
1. Supply Voltage :
If there is a problem of supply voltage,it may occurs due to variations in supply voltage,long distance between control panel and main power at property,induced current into the neutral wire or Soil ph levels.
A local ground stake at the control panel usually eliminates this problem.Also,distances over 250′ on the load side of the GFCI breaker can cause nuisance tripping.
2. Unbalanced,Intermitant Loads :
If the cause of this nuisance tripping is Unbalanced or Intermitant Loads then on 240v units,check for unbalanced loads on the power line.These unbalanced loads(refrigerators,Air conditioners,etc)switching on and and off can cause the GFCI breaker to trip randomly.
If your GFCI breaker not trips randomly then may be your breaker is tripping on overcurrent.And the cause of this overcurrent is High Amps.
High Amps :
If a unit is under greater than normal load due to clogging or a faulty motor,the amp draw could rise and cause the breaker to trip.If nothing is clogging the unit and the amp draw is too high,it needs to be looked at by an Authorized repair center.
How Do Circuit Breakers Work To Prevent Electrical Fires
Posted by admin in Circuit Breakers Work on September 26, 2011
The main work of the breakers is to limit the current of the conductor upto a safe level.As we all know that there are always too many appliances plugged in together in one circuit,which occurs a load on the conductor. You trip a breaker, hopefully you then transfer load to another circuit. Breakers use two different methods to accomplish tripping, one is a bimetallic strip.The current passes directly through it and when current crosses the highest limit according to the particular designed breaker it causes the strip to deflect. It acts on a mechanism much like the sear in a guns trigger, the deflection pulls the trigger causing a spring to open the contacts and turn off the circuit. Another type is thermal magnetic, current passing through the breaker causes a magnetic field to act on a coil tripping the breaker. When breakers are wired and work properly they prevent fires.An electrical fire is any fire that is caused by electrical short circuits, overloaded circuits or faulty electrical equipment. Anything that causes excessive current flow has the ability to create fire, including lighting the number one cause of overloaded circuits. Make sure you don’t have an outdated circuit breaker box by finding an electrician to check it for you.
The Things Which You Can Do To Prevent An Electric Fire :
1. First of all keep this in your mind that the main reason of an electric fire is mostly an overloaded electrical circuits,so the first thing you can do is not to put an excessive load on one circuit.
2. Identify the circuits in the breaker box. The breaker box usually tells the amperage of each circuit as well as the outlets serviced by the circuit.
3. Maintain wiring’s, appliances and electrical fixtures. Another thing to put on your list of things to do as a responsible homeowner is to maintain your appliances and make sure the wiring in your home is updated.
4. Ask an electrician about installing ground-fault circuit interrupters (GFCIs) in your home. GFCIs quickly shut off power when problems occur, minimizing electrical shock hazards.
5. Appliances that malfunction may cause an electrical fire, so make sure your appliances are working properly. If you have an electrical appliance that you know is overheating or short-circuiting, shut off the breaker before you unplug the appliance. Electricity takes all paths to the ground, even if that means through you.
Circuit Breakers Work Diagram
Posted by admin in Circuit Breakers Work on September 10, 2011
The circuit breaker is a most essential device for this modern world, and one of the most important safety mechanisms in your home. Whenever electrical wiring in a building has an overflow of a current through it, these simple equipments cut the power until somebody can fix the problem. Without circuit breakers (or the alternative, fuses), household electricity would be impractical because of the potential for electrical fires and other mayhem resulting from simple wiring problems and equipment failures.These are few Circuit Breaker Diagram presented here.
Understand The Working Of A Circuit Breakers Through A Diagram :
Trip Coil Monitor
The Trip Coil Monitor provides four form “C” dry contacts, one for each channel monitored. If the coil system has continuity, the contact is held in the closed position. Each channel is connected in series and forms a closed circuit that, with the use of station DC or AC power, sends an energized signal to the base unit.It ensures that the trip coils are functional and it monitors up to four trip coils simultaneously.The benefits of using trip coil monitor are that it eliminates the need of periodic coil checks and it reduces system down-time by alarming coil failures.
The trip coil monitor is a convenient panel mounted relay that utilizes LEDs for visual indication and an added SCADA alarm feature.The trip coil monitor provides continuous monitoring of the breaker trip coil as well as the breaker’s 52b auxiliary contacts.The trip coil monitor eliminates nuisance alarms via a built in time delay circuit.This provides for a reliable SCADA alarm and local indication when either the trip coil opens or the breaker doesn’t complete its trip operation.The trip coil monitor panel mounted package also has a self-monitoring feature providing both visual and SCADA alarm indication if there is a loss of voltage.
Few Types Of Trip Coil Monitors Are Listed Below :
1. Electroswitch Trip Coil Monitor :
Features Of The Product :
1. LED indication of open trip coils or breaker failure to trip
2. Dual trip coil monitoring option available
3. SCADA indication of open trip coil,loss of voltage or failure of the breaker to trip.
4. Standard alarm time delay
5. Replaceable,Industry standard LED
6. Convenient easy to wire design
7. Standard TCM covers 48-125 VDC applications
Benefits Of The Product :
1. Continuous monitoring of trip coil continuity.
2. Built in delay feature eliminates nuisance alarms.
3. Solid state design prevents false alarms due to magnetic field interference.
4. Minimal behind panel space required.
5. Extended voltage capability to minimize inventory and reduce potential installation errors.
6. Eliminates needs for loss of voltage alarm.
Specification Of The Product :
1. Operating Voltage Range : 37-140 VDC
2. SCADA Output Contact Rating : 100mA MAX
3. Operating Temperature Range : -20C to +55C
4. Standard Alarm Time Delay : 300 millisecond
5. Meets ANSI/IEEE 37.90,UL 105 UL file No E18174,ANSI/IEEE 37.90.1
2. Trip Coil Monitor SEL-2652 :
Apply the SEL-2652 Trip Coil Monitor to verify circuit breaker or lockout relay trip coil and trip circuit connections for continuity. The SEL-2652 is self-powered, displays either circuit breaker or continuity status with an external LED, and reports status to SCADA with a Form C contact.
Specification Of The Product :
1. Eliminate the need to stock different trip coil monitors with the SEL-2652, which has a wide voltage range (48 Vdc to 125 Vdc).
2. Quickly detect circuit breaker status with the SEL-2652A or continuity status with the SEL-2652B using clearly identifiable local indication LEDs available in red and blue.
3. Use convenient remote indication to easily monitor trip circuit health without nuisance alarms during normal circuit breaker operations.
4. Reduce maintenance using this rugged device, designed and tested for substation environments.
5. Install in minutes with panel-mount design and Connectorized terminal block.
Trip Coil Of Circuit Breaker
A trip unit is electrically connected in parallel with a current limiting polymer element in series with circuit breaker contacts to function as a shunt resistance for the polymer element.It becomes energized by transition of the polymer element to its high resistive state for tripping the breaker contacts. The solenoid may be particularly wound with a resistive wire.
Simplified Circuit Diagram Of Trip Circuit Of A Circuit Breaker :
Here a simplified circuit of a typical relay is given.Basically the relay circuit is a three phase circuit and the contact circuit of relays is very much complicated. This diagram is of single phase simplified circuit to explain the basic action of a relay. Let part A is the circuit to be protected. The current transformer(C.T.) is connected with its primary winding in series with the line to be protected. The secondary winding of the current transformer is connected in series with the relay coil. The relay contacts are the part of a trip circuit of a circuit breaker. The trip circuit consists of a trip coil and a battery, in addition to relay contacts. The trip circuit can operate on a.c. or d.c.
If the fault occurs, Then current through the line connected to A increases to a very high value.Then the current transformer senses this current. Accordingly its secondary current increases which is nothing but the current through a relay coil. Thus the relay contacts get closed mechanically under the influence of such a high fault current. Thus the trip circuit of a circuit breaker gets closed and current starts flowing from battery, through trip coil, in a trip circuit. Thus the trip coil of a circuit breaker gets energized. This activates the circuit breaker opening mechanism, making the circuit breaker open. This isolates the faulty part from rest of the healthy system.
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