Contents
How does a magnetic ballast work?
The magnetic ballast uses a magnetic transformer of copper windings around a steel core to convert the input line voltage and current to the voltage and current required to start and operate the fluorescent lamps. Capacitors are added to assist lamp starting and power factor correction.
Is a ballast a resistive load?
If they use an electronic ballast, the power factor is nearly 1, so nearly the same as resistive. For LED lamps, the current limiter may be via a series capacitor, hence the load may be slightly capacitive. Except for tungsten filament lamps, all other lighting load is inductive in nature.
What are the disadvantages of magnetic ballast?
Some disadvantages of the inductive ballast are: they are less efficient than capacitive ballasts, they cost more, they weigh more, and they take up more space. Magnetic ballasts are typically used in reactors using medium pressure (MP) lamps.
Are digital ballast better than magnetic?
These use solid state circuitry to transform and regulate the power output to the lamp. They’re much smaller, lighter and efficient than magnetic ballasts.
What is inside a ballast?
A magnetic ballast (also called a choke) contains a coil of copper wire. The magnetic field produced by the wire traps most of the current so only the right amount gets through to the fluorescent light. That amount can fluctuate depending on the thickness and length of the copper wire.
How long do magnetic ballasts last?
According to the Certified Ballast Manufacturers Association, the average magnetic ballast lasts about 75,000 hours, or 12 to 15 years with normal use.
Can you run a 1000 watt bulb in a 600 watt ballast?
Using it to dim down a bulb, for example to run a 1000w watt bulb at 600w, is not ideal. The better use is to dim the ballast down to 600w and then use it to run an actual 600w bulb. That is the big advantage of a dimmable ballast: it allows you to power bulbs of multiple wattages.
How to switch from a magnetic ballast to an electronic ballast?
Hold the tip of a noncontact electrical tester next to the wires on the side of the light switch. If the tester light comes on, turn off additional breakers or the main circuit breaker and test again until the tester light no longer comes on. Replace the switch cover. Place a stepladder beneath the light fixture, if necessary.
What does a magnetic field do to an inductor?
That magnetic field represents the energy in an inductor that we spent in creating it with voltage and current. Given that inductors always fight changing currents, there’s a certain amount of extra work our current will have to do initially to create a stable magnetic field.
How do you change the ballast on a light fixture?
Replace the switch cover. Place a stepladder beneath the light fixture, if necessary. Pull the light diffuser off of the body of the light fixture and remove the light bulbs. Loosen the screws and remove the access panel. Remove the wire nuts from the black and white wires connecting the ballast to the electrical circuit.
How do you connect a ballast to a breaker?
Connect the ballast to the power from the breaker panel by wiring the black wire from the breaker panel to the black wire on the ballast, using a wire nut. Connect the white wire from the breaker to the white wire from the ballast. Tuck the wires into the wiring compartment and replace the panel cover. Reinstall the light bulbs and the diffuser.