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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.


What is the starter current draw?

Starter current draw refers to the amount of electrical current that an automotive starter motor consumes when it is activated to crank the engine. This current can vary widely, typically ranging from 100 to 300 amps for most vehicles, depending on the engine size and starter design. The high current draw is necessary to overcome the engine's inertia and initiate combustion. Prolonged or excessive current draw may indicate issues with the starter or battery.


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.

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Why aren't contactors used in residential and small commercial electric heating units?

Contactors are typically not used in residential and small commercial electric heating units due to their design and operational requirements. These units often operate at lower power levels where simpler, more cost-effective relays or thermostatic controls can efficiently handle the load. Additionally, the size and complexity of contactors may not be necessary for smaller systems, which prioritize ease of installation and maintenance. Lastly, the use of more straightforward controls enhances reliability and reduces manufacturing costs.


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