Author Topic: Pic of room.destroyed in fire caused by guess what? a CFL!  (Read 2547 times)
Silverliner
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Pic of room.destroyed in fire caused by guess what? a CFL! « on: December 28, 2010, 11:44:59 AM » Author: Silverliner
http://www.eveningtribune.com/features/x1882979636/Compact-fluorescent-light-bulb-to-blame-for-Hornell-fire
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dor123
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Re: Pic of room.destroyed in fire caused by guess what? a CFL! « Reply #1 on: December 28, 2010, 02:09:56 PM » Author: dor123
Now ANSI, should ban the chinese CFLs that uses electrodes fusing mechanism as the ballast protection. Because in 120V it uses voltage doubler that overheats the electrolytic capacitor and explodes it.
The ANSI, should ban unbranded or unknown brand CFLs and allow only CFLs from known brands and also to force the companies to not include an electrode fusing mechanism.
Perhaps the lamp that exploded was a smugled lamp.
At least, CFL explosions (Fire) are nonexist in Israel.
I think, it is the time for the whole North America to move from 120V, 60hz mains to 230V, 50hz mains.
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Re: Pic of room.destroyed in fire caused by guess what? a CFL! « Reply #2 on: December 28, 2010, 02:52:17 PM » Author: Medved
The "Lamp EOL ballast protection" and "Fail safe fire protections" are not the same thing.
The protection against lamp EOL has to ensure, then the ballast is not damaged by effect caused by failing lamp, nothing more. So it does (and is only able to) respond only to very limitted set of signatures (characteristic for failing tube). And this is not needed in CFL's, as they are throw-away products and it does not ensure their safety anyway.

What cause the fire is not only the failing lamp, but e.g. EOL of the ballast itself and mainly the nonpassive nature of such failure.

And if it is the electronic, what fail (and in such case it is the capacitor and/or power stage), the control part can not do anything with any consequence.
The only option is to ensure, then any failure/damage is contained within the CFL assembly, what mean e.g. proper fusing scheme. But this does not end with adding an overcurrent fuse to the input, you have to ensure it will trigger and disconnect the mains in any case soon enough for the "chain of destruction" to stop within the CFL cover.
And here is the core of the problem: The overcurrent fuse is or missing, or there are other current limitting devices, what lower the current so, the overcurrent fuse does not trip, but dissipate power (and cause overheat and fire).
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Re: Pic of room.destroyed in fire caused by guess what? a CFL! « Reply #3 on: December 29, 2010, 05:19:52 AM » Author: dor123
@Medved: So nevertheless there is ways to prevent or reduce fires in CFLs that uses electrodes fusing that operates in 120V mains voltage: by using various fire protection means. Right?
So i bet that the CFL that burned the room at its EOL, was a smuggled lamp that imported illegaly to the US and so don't passed the ANSI standards.
ANSI standards, like all of the other countries national standards institute should also apply to risks of fire, and CFLs that explodes in fire at EOL shouldn't pass the ANSI standards, and should considered dangrous or even illegal.
« Last Edit: December 29, 2010, 05:24:33 AM by dor123 » Logged

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Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

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Re: Pic of room.destroyed in fire caused by guess what? a CFL! « Reply #4 on: December 29, 2010, 09:50:37 AM » Author: DieselNut
@dor123, it would be fairly easy for USA to transition to 240 volts/60 hertz, as all households have the mains coming in that way anyway, but what would be the advantage of changing down to 50 hertz?
Simple way to prevent these fires is to use reputable equipment.  I do not buy no name chinese made anything.  At least the chinese made goods from reputable companies has some type of quality control.  Best way is to stick with magnetic preheat CFLs!  ;D
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Re: Pic of room.destroyed in fire caused by guess what? a CFL! « Reply #5 on: December 29, 2010, 11:22:29 AM » Author: Medved
@dor123:
Not "various fire protection means", but those reliable and effective fire protection means are necessity to use on any electrical device, by far not only CFL's using electrode fusing as the main tube EOL shut down.
But indeed, they are frequently not there at all and they are different for 230V and different for 120V mains CFLs: Not all of those effective for 230V work for 120V and vice versa (e.g. the input overcurrent fuse).

@Changing mains:
  Changing the frequency is practically impossible anywhere (as it is too hard tight to present infrastructure and all of that would be necessary to change at once) and there is no practical advantage of 50Hz over 60Hz (50Hz has lower transmission line losses, while 60Hz has lower transformer losses - these effects compensate out, as both 50 and 60Hz are on the practical optimum).
  Changing the voltage would bring huge safety problems, as people are not used ("thanks" to many law suits in the recent history) to think, so they would connect devices to wrong voltage and then sue for consequent damages.
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