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Joined: Nov 2000
Posts: 246
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This may be a dumb question, but I guess I have not thought about it before.
Can I put a regular incandescent lamp (120v, 100watts) on a 125vdc circuit?
I looked quickly through a couple of lamp catalogs, and did not find any DC rated lamps, the voltage rating were just listed as 120v, or 12v.
thanks
Rick Miell
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Joined: Jan 2004
Posts: 66
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yes, you can put a standard bulb on that circuit. however, you may wish to use "commercial" 130V bulbs rather than 120V bulbs since your circuit is 125V
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Joined: Apr 2002
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Incandescent lamps run fine on DC. One hitch though—most flush toggle switches are AC only. For tungsten-lamp switching, a DC {“T”} tungsten-rated switch is needed. They make plenty of racket during operation …none of that quiet AC-only stuff. They are listed as AC-DC General Use Snap Switches — UL Guide WJQR.
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Joined: Feb 2003
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Rick.
most indscent lamps can run on dc with out any troble but bear in mind that the dc verison will run slightly dimmer but not a whole alot but bulb life will be little longer too also.. i am not sure if you know this or not when bulb fail they do flash over pretty good btw just like 277 volts ac bulbs go out simuir idea so i dont know but i will guess you allready knew this or not put a over current device there to prevent serouis arc falut.
as far for switch use the genral usage snap switch .
merci , marc
p.s. i did work on one tug boat before it ran everything on dc before so i got pretty good idea how it react with it .
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)
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Joined: Aug 2001
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Filament lamps run on DC just fine, and if connected to a 125V DC supply you will obtain the same amount of illumination as on a 125V RMS AC supply.
Switches need to be the "quick-break" type for DC operation. The common "tumbler" switches used in this country when DC supplies were common employed a spring-action contact and opened and closed with a really noticeable clunk. The quiet AC-only switches will end up with burned contacts if used on DC.
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Joined: Oct 2000
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Will these switches work too? ![[Linked Image from joetedesco.com]](http://www.joetedesco.com/gallery/albums/OldDevices/OLDSWI_1.sized.jpg)
Joe Tedesco, NEC Consultant
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Joined: Nov 2000
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Ok, Thanks guys.
These lamps will be run thru a contactor, so switching will not cause a problem.
I knew you guys would give me a straight answer!!!!
Rick Miell
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Joined: Oct 2003
Posts: 152
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Joe, what were you doing at my mother's house? ![[Linked Image]](https://www.electrical-contractor.net/ubb/biggrin.gif) She still has a few of those and they work like brand new. Amazing, for being 80 years old now.
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Posts: 4,295
Joined: December 2000
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