The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Correct rotation, wrong sequence
by Potseal
12/10/16 03:14 PM
Industrail Control Panel bonding per 409.108
by sparkyinak
12/09/16 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
New in the Gallery:
12.5A through 0.75mm≤ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 12
HotLine1 10
Potseal 9
sparkyinak 8
Texas_Ranger 8
Who's Online
1 registered (sparkyinak), 207 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#197428 - 11/28/10 03:05 PM Fluorescent Ballast Life
cgw Offline
Member

Registered: 07/29/04
Posts: 133
Loc: Rochester NY
I have just replaced the ballast in the fixture over my desk for the second time in less than 5 years. This is as much or more than the lamps. It is a 2 lamp 120V T8 electronic. The fixture is on a lot. What is the expected life of a ballast? (they are pretty low end ballast I am sure)

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#197430 - 11/28/10 11:28 PM Re: Fluorescent Ballast Life [Re: cgw]
Tesla Offline
Member

Registered: 06/16/04
Posts: 1280
Loc: Sacramento, CA
Sample size too low to make conclusions....
_________________________
Tesla

Top
#197437 - 11/29/10 08:36 PM Re: Fluorescent Ballast Life [Re: Tesla]
Steve Miller Offline
Member

Registered: 08/30/01
Posts: 322
Loc: Loudoun Cty, VA
We have 75 buildings in our school system. Most are 277v on the lights and most are T8 2 or 3 tube. It's not uncommon to see ballasts last 7-10 yrs. With that said ... most of our rooms burn all day (no repeated on/off cycles); I suspect that has some effect on the life. Our newer schools have occupancy sensors that shut off the lights regardless of the switch position but they haven't been in long enough to see if it affects the ballasts. The ballasts and bulbs that don't seem to last are the gym fixtures that use 8 compact fluors (4 ballasts) per fixture.

Top
#197442 - 11/30/10 06:32 AM Re: Fluorescent Ballast Life [Re: Steve Miller]
KJay Offline
Member

Registered: 11/27/07
Posts: 763
Loc: MA, USA
I just changed the 2-lamp T-8 ballasts in one of the shop lights over my bench for the second time in probably five or six years as well. Like the OPís, it also gets a lot of use.
I remember back when the T-8 electronic ballasts first came out, they would frequently burn out sometimes only within a year or two. Those GE Triad ballasts come to mind.
To me anyway, the newer ones made in the last few years seem better as far as life span goes, but IMO, they still donít last anywhere near as long as the old potted magnetic ballasts used to.

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals