If the nameplate rating is 56 amps then that is the maximum amount of current that the motor should draw. If you are talking about the inrush current and not the run current, the current could get up to 300% instantaneously for five time cycles over full load amps. It is this condition that allows a larger size breaker or fusing to be used on smaller size wiring. The high current is not on the wire long enough to start doing physical damage to the insulation.
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Full load amps is the amperage at which the motor was designed to work at to achieve its rated horsepower. Service factor amps is the amount of a periodic overload at which a motor can operate without overload or damage. Continuous operation within the service factor amps will shorten the insulation and motor bearing life of the motor as the motor will be operating at a higher temperature than it was designed to.
A three phase 30 HP at 240 volts draws 80 amps. Motor feeders have to be rated at 125% of the motors full load amps. 80 x 125% = 100 amps. A # 3 copper conductor with an insulation factor of 75 or 90 degrees C are rated at 100 and 105 amps respectively. Non-time delay fusing is 225 amps, time delay fusing is 125 amps and a circuit breaker is sized by 250% x 80, the full load amps, which equals 200 amps.
hp= 745.699872so if the rated voltage is 220 so 745.699872 /220=3.389 A
A motor that is rated at 250 full load amps will need 400 amp time delay fuses or a 500 amp frame breaker with adjustable amperage trips. The wire size for this motor has to be 125% of the motors FLA. 250 x 125% = 312 amps. A 350 MCM copper conductor with an insulation factor of 90 degrees C is rated at 325 amps.
Full load amps is the maximum rated amps that the motor should draw according to its nameplate rating. Running load amps is the actual amperage the motor is drawing at that point in time when the test is taken. Some motor loads vary depending on if the load is cyclic. The reading on this type of motor would be from no load amps to full load amps.
Electric current can be either direct or alternating. ... Current density can also be expressed in amperes. Depending where you live will depending on what the voltage is and the carried amps. In the U.S., a conventional 120 V outlet is rated for a maximum current of 15 A, and the upstream wiring and circuit breaker should be designed to tolerate that. In the UK: The maximum current that can be drawn from a single UK socket is 13 amps (13A) and the maximum that can be drawn from all the sockets on a single ring-main together is 32A.
Maximum amps for chassis wiring : 101 amps Maximum amps for power transmission : 37 amps Reference : http://www.powerstream.com/Wire_Size.htm
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Full load amps is the amperage at which the motor was designed to work at to achieve its rated horsepower. Service factor amps is the amount of a periodic overload at which a motor can operate without overload or damage. Continuous operation within the service factor amps will shorten the insulation and motor bearing life of the motor as the motor will be operating at a higher temperature than it was designed to.
Watts = Volts times Amps. Therefore, if the voltage was 220 volts, the motor would draw 500 amps. If the voltage was 4,000 volts, the motor would draw 27.5 amps. The voltages for large powerful motors tend to be relatively high, for example in the 380 Volts to 11,500 Volts range.
#14 copper wire is rated at 15 amps, # 12 copper is rated at 20. The maximum capacity of any wire is 80% so remember to derate your current by multiplying the rated current by .8
Amount of electric current flowing through the vacuum. Watts: Amps multiplied by the power voltage drawn. Most upright cleaners are 7 to 12 amps. Many canister models are 12 amps. The maximum allowable amps that can be plugged into a household outlet is 12 amps.
The Full Load Amps, FLA is a rating for each winding of the motor. In this case the motor actually needs 4 amps running through it. As current needs to go somewhere (perferably not to ground) the 4 amps will circulate on you 2 Hots, the neutral isn't needed. 4A in, 4A out.
#14 copper wire is rated for 15 amps.
A #10 copper conductor with an insulation rating of 90 degrees C is rated at 30 amps. The only time that a breaker larger that the load maximum capacity can used is in motor connections. A breaker can be used sized at 250% of the motor's full load amperage. In this case a 50 amp breaker can be used on a #10 conductor if the motor's full load amps falls within the amperage's of 20 - 22 amps.
5 HP is 5 x 746 watts or 3730 watts. The motor has an estimated efficiency of 90% so the total power drawn is 3730/0.9 or 4144 watts. With an estimated power factor of 0.8 the volt-amps are 4144/0.8 or 5180 VA. On a 220v system the amps would be 5180/220 or 23.5 amps.