Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!ux1.cso.uiuc.edu!ux1.cso.uiuc.edu!uxa.cso.uiuc.edu!smlg1015 From: smlg1015@uxa.cso.uiuc.edu Newsgroups: sci.electronics Subject: Ballast Boxes Message-ID: <108800003@uxa.cso.uiuc.edu> Date: 29 Oct 89 18:39:00 GMT Lines: 9 Nf-ID: #N:uxa.cso.uiuc.edu:108800003:000:421 Nf-From: uxa.cso.uiuc.edu!smlg1015 Oct 29 12:39:00 1989 When I moved into my present apartment, the fluorescent lights emitted a loud buzzing noise. Upon examination, the noise seemed to be coming from something marked "Ballast Box: Class P". I replaced it and the noise stopped. Can somebody tell me what a Ballast Box is and how it works? I opened the old one and found some kind of black paste surrounding the wires. Stuart Lichtenthal smlg1015@uxa.cso.uiuc.edu