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The size of the contactors are dependant upon what the voltage the motor is operating on.

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How do you get a starter out of a fluorescent light tube?

The starter should easily fit into the florescent fixture by sliding it into the hole and then securing it by twisting it in place. If you are having issues, you may need to check to ensure that you have the correct size starter for your florescent tube.


Why DC battery is required for generator?

The starter motor of a diesel generator is a DC motor. Depending on the size of the diesel engine the starter motor could be 12 volts or 24 volts. Sometimes more that one battery is used at the specific voltage. These batteries are connected in parallel to create more amp hour cranking power.


What are the parameters on which the timing of star delta starter depends?

The timing should allow the motor to get up to full RPM in the star configuration before switching to delta configuration. Depending on the motor size and inertia loading it will be from 5 to 10 seconds.


What size of magnetic starter would be necessary to control a 3 phase 208 volt 5hp squirrel cage induction motor?

The starter is sized by amperage of the motor. The first thing that has to be done is find the the current by using this formula for amperage when the HP is known. I = HP x 746/1.73 x E x %eff x pf. A standard motor's efficiency between 5 to 100 HP is .84 to .91. A standard motor's power factor between 10 to 100 HP is .86 to .92. Amps = 5 x 746 = 3730/1.73 x 208 = 3730/360 x .84 x .84 = 3730/ 254 = 14.68 amps A three phase size 1 magnetic starter is rated for 27 amps and can be used up to 7.5 HP. If the voltage was 460 to 575 a size 0 could be used.


Are all large motors three-phase?

Yes, most large motors are three phase. Usually single phase motors only go up to 10 HP. Larger than this and the wire size and contactors used to control the motors becomes extreme. For example a single phase 10 HP motor on 115 volts draws 100 amps. The same single phase motor on 230 volts draws 50 amps. The same 10 HP motor on three phase system draws the following amperage; 230 volts is a 28 amp draw, 460 volts is a 14 amp draw and 575 volts is a 11 amp draw. As you can see the higher the voltage becomes, the smaller the wire feeder size is needed and much smaller size contactor can be used to control the motor.

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