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

Topic Options
Rate This Topic
#21024 - 01/25/03 08:05 PM dimming switches
rj Offline
Registered: 01/23/03
Posts: 21
Loc: Skidmore, Missouri, USA
I have been told that an incandescent dimmer switch will not dim a fluorescent light.
We had a service call that the lights would come on but they would not dim. Upon taking the switch out it was an incandescent dimmer. There were 2 other dimmer switches beside this one. They were both incandescent dimmers and they were all dimming t8 lamps.
I was wondering if anyone has ever found incandescent dimmers, dimming fluorescent lights?
Work Gear for Electricians and the Trades
#21025 - 01/25/03 08:10 PM Re: dimming switches
waymag Offline
Registered: 01/13/02
Posts: 67
Loc: dallas, texas, USA
I could be wrong but I believe the flourescents need to have dimming ballasts and a regular dimmer switch will work with these. That may have been the case where you were.
#21026 - 01/25/03 08:15 PM Re: dimming switches
iwire Offline
Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
Yes, and I had to eat my words to a customer after putting down someone else's work.
The ones I ran into had Electronic ballasts made Energy Savings Inc. They were running 26 watt PL lamps.

In small print on the Ballast it said it was dimming ballast, in the past the only dimming ballasts I had worked with needed 3 wires from switch to ballast, and this just had 2

I too found these on a service call, they said for couple of days the lights where blinking then same as you descibe they would turn on and off but not dim

I do not know what the fix was, the customer went back to the installer as it was new work.

[This message has been edited by iwire (edited 01-25-2003).]
Bob Badger
Construction & Maintenance Electrician
#21027 - 01/25/03 08:21 PM Re: dimming switches
caselec Offline
Registered: 04/14/02
Posts: 558
Loc: San Jose, CA
Fluorescent lamps need a dimming ballast and fluorescent dimmers designed to work with the ballast. I have never seen any dimming ballasts designed to work with incandesent dimmers.

Curt Swartz
#21028 - 01/25/03 08:27 PM Re: dimming switches
waymag Offline
Registered: 01/13/02
Posts: 67
Loc: dallas, texas, USA
Thanks Curt I was pretty sure i was wrong. You don't see this very often.
#21029 - 01/26/03 06:42 PM Re: dimming switches
Redsy Offline
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
All incandescent dimmers I have seen state that they are to be used on permanently installed incandescent lighting only.

Member Spotlight
Member Since: 12/24/00
Posts: 4259
New in the Gallery:
SE cable question

2017 NEC and Related
2017 NEC
Now Available!

Shout Box

Who's Online
1 registered (gfretwell), 95 Guests and 9 Spiders online.
Key: Admin, Global Mod, Mod
New in the Gallery:
SE cable question
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
Newest Members
Freecrowder, clee512, Jdscott2005, FAIZAN, Regitest2

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