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The formula you are looking for is I = kva x 1000/1.73 x volts.
This relates to 118 amps.
A #2 wire with an insulation factor of 90C is rated at 120 amps.
Factoring in 80% capacity you should go to the next wire size which is a #1.
A #1 wire with an insulation factor of 90C is rated at 140 amps.
<<>>
bout 4mm
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Wiki User
∙ 14y ago
Wiki User
∙ 12y agoSome of this has to do with the length of the cable run but assuming a 100 foot run you should use no less than a 10 AWG copper wire or an 8 AWG Aluminum wire. With this size of generator be SURE to get everything grounded properly!
Wiki User
∙ 11y agoCable size is based on amperage.
The formula for amperage when the Kva is known is; Amps = kva x 1000/1.73 x Volts. 30000/1.73 x 220 = 30000/380 = 79 amps.
The North American code states that the conductor size feeders for motors or generators has to be 125% of the amperage output or input. Therefore 79 x 125% = 98.8 amps.
A #3 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 100 and 110 amps respectively.
Wiki User
∙ 9y agoThe line-to neutral voltage is 120 v and the line current is 50,000/3/120 or 139 amps, with a cable size of 0 gauge US.
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What are advantages of three phase ac and a single phase ac?
In a typical 3 phase system you have multiple voltages and configurations that can be used in either single phase or 3 phase, depending on how the circuit is designed. A single phase system is just single phase. You can have multiple voltages but it is always single phase.For example, in a typical 277/480v 3 phase system you can power 277v single phase lighting or equipment, 480v single phase lighting or equipment (which uses 2 legs of the 3 phase system but operates like any other single phase circuit), or 480v 3 phase motors.When comparing motors, a 3 phase motor will be substantially smaller than a single phase motor of the same horsepower. You can also reverse a 3 phase motor by switching any 2 leads. A single phase AC motor runs in one direction regardless of how the leads are connected.AnswerFor a given load, a three-phase transmission system requires less volume of copper in terms of conductor size, compared to single phase, so it is more economical to use three-phase.
What size main breaker feeding 480v 75 kva transformer?
An exact breaker size can not be given because the voltage, and hence the calculation for current, is not given. A transformer shall be protected by an over current device that is not rated at more that 150% of the primary current.
Can you use a 30 amp disconnect switch for a 30 kva transformer?
im have a 30 kva transformer 3 phase 480v 80 amp panel 120v what size disconnect should I use
How do you convert 1 phase 240 volt power to 3 phase 480 volt power?
Any two legs of the 480V will give you 240 V Single phase. I apologize for the wrong information here. A friendly member reminded me of the correct answer. I stand corrected. Any two legs would be at 480 single phase. One leg to neutral will give you 277volts not 240 (408/1.73). You would need to install a step down transformer on the 277v line to achieve 240v.
What is the typical 460 3 phase voltage 1 leg to ground?
230v 230v In a transformer with a primary connected to 480V Delta and a secondary connected in 480V Star connection, the coil voltages to the star point (ground) are 277 volts 480 / 1.73 = 277 volts. Other star connections are 208/120 (208/1.73 = 120V), 600/347 (600/1.73 = 347V). Because the phase angles are not 180 degrees apart they are not additive, they are 120 degrees apart which is why 1.73 factor comes into play.
Can a 600V rated cable be use in 480V 3 Phase Ckt?
yes,
Can you modify a 220v generator into 480v power output?
Not on small household generators as they are only single phase. On large industrial 3 phase machines over 100 KW there are internal taps that can be changed depending on the generator coil configurations to select a variety of voltages.
What does 277 vac mean?
That's 277 volts of alternating current. This is typically one phase of a 480v 3 phase system. Don't worry that 3 x 277 adds up to more than 480v. A 277v line is typically one phase of a 480v 3 phase system.
What is the nominal voltage of a 150 kW 480 v generator?
480V.
How do you convert 380v 3 phase to 220v 3 phase?
Mathematically, just divide 480 by the square root of three. Electrically, 480V refers to the line-to-line value of a three phase system. For example, measure the voltage across A-phase and B-phase and you'll get 480V. 277V is the line-to-neutral value. Measure the voltage across A-phase and the neutral conductor and you should get 277V.
What is the voltage for each leg on a 480v 3-phase pannel phase to neutral?
Only one neutral conductor is typically in a 3 phase panel.
What does each of the phases mean?
480V, 3 phase, 60A means 60A flows for each phase? or 60A flows at neutral.
How is line voltage computed in a wye three phase cofiguration?
Line voltage equals phase voltage multiplied by the square root of three. a.k.a. E l = E p X 1.73 In a 3 phase 480v system the phase voltage is 277v. Therefore E l = 277 X 1.73 = 480v
What is the high leg in a three phase 480 panel?
there isnt a high leg in a three phase 480v panel only on 240v panels
What size wire to use with 50 amp 480v 3 phase so cord size?
6
Difference from 1phase generator and 3phase generator?
Single Phase or 1ph is typically what you would find in a residential dwelling or light commercial setting. 120 / 240 volts are single phase 120/208 can be single phase as well.Three Phase or 3ph is typically what you would find in a heavy commercial or industrial enviroment. 277 / 480 voltsin 1ph L-1 to N or G= 120v L-1 to L-2= 240vin 3ph L-1 to N or G= 277v L-1 to L-2= 480v, L-2 to L-3= 480v orL-3 to L-1=480vIf you were to look at Phase power it would be1ph 3phL-1 L-2 N G OR L-1 L-2 L-3 N GL= LineN= NeutralG= Ground
What cable size of wire if the machine is 50hp?
If it is a 480v 3 pH machine, #4 wire will be fine.
