Is a buzzing ballast dangerous?
Is a buzzing ballast dangerous? The humming is caused by loose laminate plates in magnetic ballasts. Not likely a hazard but very annoying if it's too loud. They should change out the fixture or replace the ballast if they can't accept the noise. This electric noise is caused by the vibration of the motors or fans in these devices and is not harmful. What causes a ballast to buzz? When current is present and running through the ballast it creates a magnetic field which in turn slows the current – keeping it in check. The ballast makes this buzzing noise...