Loud electronic ballast

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powerplay

Senior Member
I changed a Phillips Advance T-12 ballast (Model RELB1S40SC for 3 or 4 foot ballasts) for an single tube F30 tube which the ballast is rated to supply. Within 30 minutes it started to buzz like an old style magnetic ballast. I beleive the sound must be coming from the ballast... is it due to bad endholders/contact, or simply a defective ballast? Thanks again in advance.
 

ron

Senior Member
I'm confused. Did you leave the RELB-1S40-SC in there or replace it? If you replaced it, then it is likely a balast with a high sound rating.
As I read further, I guess you replaced it with a RELB-1S40-SC since that is only rated for 1 lamp. It has a Class A sound rating. Maybe vibration from the lamp holders? Touch the lamp and see if the sound changes.
 

LEO2854

Esteemed Member
Location
Ma
I changed a Phillips Advance T-12 ballast (Model RELB1S40SC for 3 or 4 foot ballasts) for an single tube F30 tube which the ballast is rated to supply. Within 30 minutes it started to buzz like an old style magnetic ballast. I beleive the sound must be coming from the ballast... is it due to bad endholders/contact, or simply a defective ballast? Thanks again in advance.
It could be that the ballast is just loose .

Try to tighten up the screws.
 

powerplay

Senior Member
My thought was that it was a 4 foot ballast trying to drive an 3 foot one....and was wondering if damage would have caused the hum, but it says good for 3 or 4 foot F30. i've heard that 10% electonics seems to be a failure rate at times...did I get lucky and findone?
 

Little Bill

Moderator
Staff member
Location
Tennessee NEC:2017
Occupation
Electrician
My thought was that it was a 4 foot ballast trying to drive an 3 foot one....and was wondering if damage would have caused the hum, but it says good for 3 or 4 foot F30. i've heard that 10% electonics seems to be a failure rate at times...did I get lucky and findone?
There's your answer right there. If the ballast is 3 or 4' long I would expect it to hum or take off and fly!:lol:
 

LEO2854

Esteemed Member
Location
Ma
My thought was that it was a 4 foot ballast trying to drive an 3 foot one....and was wondering if damage would have caused the hum, but it says good for 3 or 4 foot F30. i've heard that 10% electonics seems to be a failure rate at times...did I get lucky and findone?
Most Ballast that are rated for 4' lamps will also be rated for 3' lamps so i would try another ballast.
 
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