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

Topic Options
Rate This Topic
#58332 - 11/05/05 07:59 PM lamp switches
ds247 Offline
Member
Registered: 05/17/03
Posts: 18
Loc: California
Just curious but does anyone know why many incandescent table lamp switches click twice rather than once to turn on and off?
Top
Work Gear for Electricians and the Trades
#58333 - 11/05/05 08:28 PM Re: lamp switches
SvenNYC Offline
Member
Registered: 08/19/02
Posts: 1691
Loc: New York City
ARe you thinking of three-way bulb sockets perhaps?

There are four positions: low, medium, high and off.

Of course this only works with the proper three-way bulb.

If you insert a standard bulb you will have to turn the key from its off position to the first "low" position" for which there is no contact.

The next stop would be medium and you'd get light.

The next stop is high and the bulb is still on (since medium and high use the same higher wattage filament in a three way bulb).

After that you turn the bulb off.

My guess is you're using the wrong bulb in your lamp.
Top
#58334 - 11/06/05 06:47 AM Re: lamp switches
DougW Offline
Member
Registered: 06/08/03
Posts: 1143
Loc: North Chicago, IL
+1 for the three-way socket.
Top
#58335 - 11/06/05 07:12 AM Re: lamp switches
ComputerWizKid Offline
Member
Registered: 09/20/03
Posts: 119
Loc: Connecticut, USA
Is there any danger (as long as you don't go over the rated wattege posted on the socket Usually 150W) of using a regular bulb or Compact Floruscent in a 3 way socket?
_________________________
Theres always enough room in the junction box.You just need a bigger hammer
Top
#58336 - 11/06/05 07:52 AM Re: lamp switches
Sixer Offline
Member
Registered: 08/08/05
Posts: 265
Loc: Canada
There should be no danger of putting a normal compact fluorescent in a tri-light socket...but they do make CFL's specifically for tri-lights and dimmers. I've got a normal CFL in my tri-light and it's been there for years and hasn't given me any problems.

A regular tri-light bulb has 2 filaments, on low one filament is on, medium other filament is on, and on high both filaments are on. If you look in the socket you will see an extra "pin" between the center point of the socket and the threads that the lamp screws in to...this pin supplies power to the 2nd filament.

This link has some good info on CFL's: http://oee.nrcan.gc.ca/energystar/english/consumers/questions-answers.cfm?attr=4
_________________________
Sixer

"Will it be cheaper if I drill the holes for you?"
Top
#58337 - 11/06/05 01:56 PM Re: lamp switches
Texas_Ranger Offline
Member
Registered: 12/17/01
Posts: 2391
Loc: Vienna, Austria
Funny - I just stumbled across such a "double click socket" in the middle of Europe! A friend of mine has an imported US floor lamp and mentioned the weird switch today... just ditched everything but the shade today though (the socket had a bad internal short arcing to the bottom part of the bulb screw shell (next to the black stuff that separates center and shell)... and since the thread on the lamp is US it prove impossible to replace the shot socket with a European one which has a metric thread...
Top
#58338 - 11/07/05 10:10 AM Re: lamp switches
SvenNYC Offline
Member
Registered: 08/19/02
Posts: 1691
Loc: New York City
Ragnar, You could have given me a holler. I have plenty of spares knocking about. Both standard American lampholders and three-way (hi/lo) ones.
Top

Member Spotlight
Member Since: 04/03/02
Posts: 6778
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 70 Guests and 10 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
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

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