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What are the two functions of ballast?

What are the two functions of ballast?

Functions of Ballast

  • It provides levelled bed or support for the railway sleepers.
  • It transfers the load from sleepers to subgrade and distributes the load uniformly on subgrade.
  • It holds the sleepers in a firm position while the trains pass by.
  • It prevents the longitudinal and lateral movement of sleepers.

What happens if you don’t use a ballast?

Without a ballast, a lamp or a bulb will rapidly increase its current draw and it can become uncontrollable as well. When a ballast is present in a lamp, the power becomes stable, and even if such lamps are connected to high power sources, the ballast will regulate the energy and avoid the current rise.

How do electronic ballasts work?

Working Principle of an Electronic Ballast Electronic ballast takes supply at 50 – 60 Hz. It first converts AC voltage into DC voltage. Once the discharge process is started, the voltage across the lamp is decreased below 230V up to 125V and then this electronic ballast allows limited current to flow through this lamp.

What does a ballast do for LED lights?

A ballast regulates the current that’s coming at a lamp. It gives an initial burst just to get things going, then it makes sure the electric current is controlled and steady. Not getting the lamp’s shoes all wet. A ballast for Light Emitting Diode (LED) lights is not required – instead a driver is required.

What are the three important functions of ballast?


  • To provide firm and level bed for the sleepers to rest on.
  • To allow for maintaining correct track level without disturbing the rail road bed.
  • To drain off the water quickly and to keep the sleepers in dry conditions.

What are the properties of ballast?

Good-quality railway ballast should have angular particles, high specific gravity, high shear strength, high toughness and hardness, high resistance to weathering, rough surface and minimum hairline cracks (Chrismer, 1985; Jeffs and Marich, 1987; Indraratna et al., 1998, 2000, 2003b; Esveld, 2001).

Do you need an electrician to change a ballast?

Yes. As a matter of fact, you do need a lock out tag out device in place for changing a ballast. ‘An electrician is replacing the ballast on a fluorescent light.

How much does it cost to replace a ballast?

A replacement ballast costs about $10-25 depending on capacity and brand. The bite is that an electrician trip charge (which includes 30 or 60 minutes work) is going to be $75-150 probably – for about 5 minutes work on each light fixture.

How can you tell if an electronic ballast is bad?

5 symptoms of a bad fluorescent ballast

  1. Flickering.
  2. Buzzing.
  3. Delayed start.
  4. Low output.
  5. Inconsistent lighting levels.
  6. Switch to an electronic ballast, keep lamp.
  7. Switch to an electronic ballast, switch to a T8 fluorescent.
  8. Switch to an electronic ballast, switch to T8 linear LED.

Do electronic ballasts need starters?

Electronic ballasts do not need starters so if you are upgrading your fitting from a magnetic to electronic ballast, remember to remove the starter and starter cage.

What does a ballast do in a lighting system?

What is a ballast? In a fluorescent lighting system, the ballast regulates the current to the lamps and provides sufficient voltage to start the lamps. Without a ballast to limit its current, a fluorescent lamp connected directly to a high voltage power source would rapidly and uncontrollably increase its current draw.

What does a ballast mean in plain English?

So, what is a ballast in plain English? Let’s lose the technical jargon. To put it simply, a ballast is the functional heart of a fluorescent or HID light source. Just as a heart regulates blood flow to your body, a ballast ensures that a lamp stays lit by managing the distribution of energy throughout the fixture.

What does a ballast resistor do in a circuit?

A ballast resistor is defined as a resistor inserted into a circuit to minimize current. Ballast resistors also help to avoid over-current faults in a circuit. An “electric ballast” is a more general term used to refer to an electrical device used to maintain a circuit’s stability by limiting the value of current and voltage.

How does the heart work as a ballast?

Hearts work to distribute blood via channels, or arteries, in the body to keep a body active and alive. Ballasts do the same for the fluorescents, HIDs, and plug-and-play linear LEDs in your buildings, just with energy as the lifeblood.