0
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.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
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.
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 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.
How can a breaker work on 60Hz and 50 Hz supplies?
A circuit breaker is like an automatic switch, designed to break a circuit if the current flowing (measured in amps) exceeds a predetermined maximum amount. The frequency at which the alternating current is changing is not relevant provided it is the normal one for which the circuit breaker has been designed to operate. In USA, Canada and other countries using similar power supply standards, that frequency is 60 Hz. In Europe and other world areas using similar power supply standards, that frequency is 50 Hz. A circuit breaker designed for use on 50 Hz or 60 Hz supplies should not be used to protect a circuit in a ship or aircraft running on a 400 Hz supply because its magnetic and capacitive components may not operate correctly. For such applications a circuit breaker designed to operate at 400 Hz must be used.
A 32A breaker was controlling a lighting circuit but is now on a 6A breaker which is now buzzing what should you do?
Answer for countries in Europe and other world areas running a 50 Hz supply service.Depending on the load of your lighting circuit. I would measure the current with an inductive amp meter. once you know the current required for your lighting circuit, you then install a circuit breaker which is 15% higher than your load. eg, load is 10A. 10A load + 15 % = 12A breaker (15 A is ok as the breaker is used to protect the wiring and should be rated in consequence of your wiring by 25% less or its current rating, or less, not the load)The humming of your lighting circuit breaker indicates that your breaker is either faulty, or having a difficult time keeping a closed circuit. Or simply that the manufacturer produced a breaker that hums by nature of its construction.
Is it better to have a high or low resistance across a circuit breaker?
A circuit breaker is supposed to protect the more valuable component the circuit is connected to. Too low a resistance, a minor glitch (spike) will break the circuit and stop the device from working. Too high a resistance, no glitches, no matter how large (a child sticking a paper clip into the wall sockets, for example), will break the circuit and the device (child) may get damaged. Each circuit will have a purpose (power load), and the circuit breaker should be chosen for that purpose with some tolerance. A free standing closed circuit breaker should have no resistance across its internal contacts. The main purpose of a circuit breaker is to protect the conductors that supply the load. If the current going to the load becomes greater that the amperage rating of the wire the circuit will open thereby saving the conductors from damage. Once the load current is below the wire rating ampacity, the breaker can be reset for normal operation.
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.
What do you call a push button switch that you push on when power supply shut down you have to push it on again?
That would be a breaker, as in circuit breaker. Just like the ones on your house.
Why circuit breaker are connected in series with load?
Because it needs to be able to cut the power to the load. That's why circuit breakers are always the first piece of equipment in a circuit after the power supply.
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).
Why is a DC voltage supply used for energizing the tripping coil of an air circuit breaker?
If a fault in the system disconnects the substation, then batteries are the only supply available to trip the circuit breakers. Batteries, of course, are d.c.
