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What will happen when you use 240 Volt rated disconnect switch for a 480 Volt circuit breaker supply?
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Will a circuit breaker function the same if supply and loads are reversed?
Yes, a circuit breaker will function the same if supply and loads are reversed. This is the way that some sub panels are fed instead of a main disconnect at the top of the distribution panel.
Do you need a main disconnect on the feeder wires running to a detached garage running from the box in the house?
Yes you do. The detached garage will either be fed with a single circuit or a sub panel. The wire feeding the garage will need to be protected and that is the purpose of the breaker (disconnect). The breaker size will be determined by the size of the wire that is used on this circuit.
How do you detect if a shunt trip breaker is malfunctioning?
The way to detect if a shunt trip breaker is malfunctioning is to manually trip the breaker. The shunt is usually wired through a auxiliary relay. Make sure that before you trip the breaker that the load can be shut off without taking a production line etc. off line. Trip the auxiliary relay using a test jumper to activate the relays coil. The breaker's handle will move to mid throw and the load will disconnect from the supply power. If the breaker trips then it is working properly. If the breaker does not trip trouble shoot the circuitry that is used to trip the breaker. Usual problem is an open circuit.
What would happen if you tried to operate a dc permanent magnet motor from an ac supply?
Apart from a lot of loud humming, the motor would not turn, it would take a lot of current and, if the circuit breaker did not trip to cut the supply of current, it would probably overheat or might even catch on fire.
Why do you use a 30amp breaker on a ring circuit and a 20 amp on a radial circuit?
Answer for UK, Europe and countries running a 50 Hz supply service.A ring circuit has two routes to each outlet, a radial has only one.
Will a circuit breaker function the same if supply and loads are reversed?
Yes, a circuit breaker will function the same if supply and loads are reversed. This is the way that some sub panels are fed instead of a main disconnect at the top of the distribution panel.
What is the difference between disconnect switch and circuit breaker?
A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow.The term switchgear, used in association with the electric power system, or grid, refers to the combination of electrical disconnects, fuses and/or circuit breakers used to isolate electrical equipment. Switchgear is used both to de-energize equipment to allow work to be done and to clear faults downstream.
Why supply circuit breaker should be 4poles?
Because it has neutral with 3 phases. A supply circuit breaker is used on the lv side of the transformer to protect the equipment connecting to it.
What type of circuit breaker is required for a 240 v branch circuit?
the circuit breaker used will be miniature circuit breaker(MCB) maily used in homes.Answer for USA, Canada and countries running a 60 Hertz supply service.A two pole circuit breaker is used for a load of 240 volts. It is sized, according to the load amps of the device, to protect the wires that supply the load current.
What is racking a circuit breaker?
Racking a ciruit breaker has no place in Home Electricity. It is a purely industrial or utility activity. It refers to the act of disconnecting an open (off) high voltage circuit breaker from both the electrical supply and the load by racking (winding, if you like) it out of an enclosure.Further AnswerRacking provides a method of isolating a high-voltage metal-clad circuit breaker (in the UK, typically 11 kV) from its supply and load circuits, and/or to provide earthing (grounding). Before racking, the circuit breaker must be opened, and this is usually ensured using an interlock system. Racking describes lowering a circuit breaker so that its bushings physically disconnect from fixed busbars/cables typically located above the circuit breaker. Once racked down, the circuit breaker can either be withdrawn to allow it to be maintained, or it can repositioned before being racked up to connect either the busbars or the cable to earth (ground).
Will turning off power to a ceiling fan via a wall switch be sufficient for installing a new fan or must the circuit breaker be off too?
In most cases the switch disconnect will do the job. It depends on the circuit wiring that the fan is connected to. If the circuit is a three wire circuit you could receive a shock when you open the neutral wire if you accidentally touch the neutral and the system ground at the same time. As an electrician we always take the safer road and disconnect the power supply from the load at the breaker and not depend on the switch for complete circuit isolation.
What size fuse required to supply a continuous load of 32 amps?
80% of 40 = 32 amps Load the circuit breaker to 80% choose a conductor to suit the circuit Breaker min.
Does electric dryer get damaged by short circuit in socket?
The fuse is there to disconnect the supply when there is a short circuit, before any damage is done.
Can circuit breaker isolate circuit?
That's just what a circuit-breaker is designed to do - Isolate a circuit from the rest of the system.AnswerNot necessarily. A circuit breaker is a protective device, designed to disconnect circuits in the event of an overcurrent due to overload or short circuit. While a low-/medium-voltage circuit breaker, of course, can be used to open a circuit, it does not necessarily provide isolation. In general, isolation requires a visible break in the circuit; as a circuit breaker's contacts are enclosed, a visible break is not possible.In the case of a high-voltage circuit breaker, the device is used to open a circuit but does not isolate that circuit from the supply. Isolation must be provided using separate,usually non-loadbreaking devices (i.e. devices which are not designed to open a live circuit) called isolators (UK term) or disconnector (US/Canadian term), which provide a visual break in the circuit. The exception to this is a racking-type circuit breaker which, after it has been opened, can be racked down from the circuits to provide a visual disconnection.
What would happen to the current once a short circuit occur?
Since load current is determined by dividing the supply voltage by the resistance (for d.c., or impedance for a.c.) of the load, a short circuit would theoretically result in an infinite supply current. This is because a short circuit has, theoretically, zero resistance. In practice, however, the current would be cut off by the operation of an overcurrent protective device -such as a fuse or circuit breaker- which would disconnect the short circuit from the supply voltage. A worst-case scenario could occur should you short-circuit a car battery with, say, a spanner (wrench). With no fuse to protect the battery, the resulting short-circuit current, if sustained, may be high enough to cause catastrophic damage to the battery.
How do you repair short circuit when all appliances are tested to work properly?
If the appliances all test out and are found to have no short circuits in them then the next step is to check the supply conductors that feed the appliances. This can be easily done by unplugging the appliances and turn on its circuit breaker. When voltage to the appliance circuit causes the breaker to trip. this is the circuit with a fault on it. The most likely place is at the receptacle where the appliance plugs into the power supply. Turn the circuit off at the breaker and inspect the receptacle. If it looks suspicious change it out with a new one.
Need of isolator on both side of circuit breaker?
Before anyone is allowed to work on a high-voltage circuit breaker, it must be tripped, electrically isolated, earthed (grounded), barriers/warning notices put in place, and a permit to work document issued by an engineer to the senior member of the maintenance crew. 'Isolation' means a physical (and visible) break in the conductors between the circuit breaker and any potential source of supply -and this is provided by placing isolator switches on each side of the circuit breaker. Without these isolators, the circuit breaker would remain energized, even though the circuit has been broken by the circuit breaker.
