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What size breaker is needed for feeding 10 kva transformer at 460 v single phase?
Wiki User
∙ 11y ago
One horsepower (electric motor) is 746 watts, so ten horsepower is 7460 watts. Divide that by a power factor (assumed) of 0.8 and you get 9325 volt-amps. Divide that by a voltage (again, assumed) of 240 and you get 39 amperes.
For calculation purposes the electrical code book states that a 10 horsepower motor at 240 volts will draw 50 amps. The motor's nameplate amperage that is driving the rotary phase converter should all ways be used first.
The electrical code requires a breaker for a motor to be 250% of the motor's operating full load current. 250% of 39 amperes is 97 amperes. I would use a 100 ampere breaker for a 10 horsepower motor.
If the motor rating is used from the code book values, then 50 x 250% would equal 125 amps and that is the size of the breaker that must be used. This is the reason that the motor's exact name plate amperage rating should be used. In the long run feeder wire costs could make a saving in the overall projected costs.
Wiki User
∙ 7y ago
Wiki User
∙ 11y ago30 amp
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What happen when 220v dc is applied to a 220v ac single phase transformer?
The current would rise until it blows the fuse or breaker and that would produce an arc as the transformer's inductance tries to maintain the current.
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the auto transformer is the one winding transformer. it ismaily used in practical purpose.
How do you connect ammeter with ct in single phase?
If it's a split-phase system with centre-tapped transformer, then two ammeters are needed, one on each side.
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This depends on the voltage, and whether it is a three phase or single phase transformer.
What is the Largest amperage single phase 120 volt breaker made?
6000amps <<>> The above answer must have big lugs to accommodate 6000 amp capacity wire. In my breaker catalogue the largest 120 volt single pole breaker is 70 amps, 277 volt single pole is 150 amps and 347 volt single pole is 100 amps. The 120 volt single pole breaker occupies two opposed slots because of its length.
Why the need of harmonics in single phase transformer?
Harmonics are really not needed in single phase transformers.
How can I get 230 volt single pole wire from my house panel?
In North America you can not obtain 230 volts from just one single pole breaker. The distribution is like this, from a one pole breaker to neutral is 120 volts. From an adjacent breaker to neutral is 120 volts. From the adjacent breaker to adjacent breaker (breakers situated beside each other) the voltage will be 230 volts.If you want to incorporate a 120 to 230 volt transformer into the circuit you can obtain 230 volts. The primary side of the transformer will be connected to the 120 volt circuit and the secondary side of the transformer will output 230 volts. The transformer must be sized to the load amperage or the load wattage of the connected 230 volt load.
What happen when 220v dc is applied to a 220v ac single phase transformer?
The current would rise until it blows the fuse or breaker and that would produce an arc as the transformer's inductance tries to maintain the current.
What type of transformer has only a single winding?
the auto transformer is the one winding transformer. it ismaily used in practical purpose.
How do you connect ammeter with ct in single phase?
If it's a split-phase system with centre-tapped transformer, then two ammeters are needed, one on each side.
What is the current of 1MVA transformer?
This depends on the voltage, and whether it is a three phase or single phase transformer.
What is the purpose of conducting sc and oc test of single phase transformer?
to determine the transformer characteristics...
Can a single pole breaker goes bad?
Any mechanical device, including switches, can malfunction. You have to be careful wiring up a single pole switch, to make sure it is in the live (positive) line, not in the return (neutral) line.
What kind of a GE circuit breaker can you use in place of a GE tandem breaker?
A GE tandem breaker can be removed and replaced with a GE single pole breaker.
How many wires are used for a 460 volt circuit breaker?
If the load is single phase and the load requires 460 volts to operate, then two conductors will be needed and they will connect to a two pole breaker. If the load is three phase and the load requires 460 volts to operate, then three conductors will be needed and they will connected to a three pole breaker. The sizing of the wires will depend upon the current that is drawn by the loads.
Should you buy double pole breaker or single pole?
Use of a double pole breaker or a single pole breaker depends entirely on the application. If you don't know about the application, contact a qualified electrician in your area.
How do you convert 277v to 120v for an outlet?
i think you just have to change the breaker from a 277 to a 120. 277 breakers are usually a 2 pole breaker and 120 is a single pole breaker. NO. 277v is not two poles, it is one pole, one single pole breaker in a 480 volt 3 phase system (typically). If you want 120 volts from a 277 volt source you need a step down transformer 277 volt to 120 volt , or 480/277 to 120/208 .
