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#31
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And again, fuse designed to blow so that "damage to the
lines/devices" created by component failure does not threaten human life. Any device whose destruction can harm humans will be disconnected by fuses and other equivalent 'one shot' devices. The fuse is not installed to protect hardware. In the process of protecting humans, a fuse may protect some hardware - ie a power cord. But fuses are installed to protect humans. Any protected hardware is incidental. When a fuse blows in a power supply, a failed component often causes that open fuse. Even shorting all power supply outputs would not blow a fuse. The concept is called fold-back current limiting. The fuse is for human protection. It blows typically because a component inside the supply has failed. Furthermore many power supplies don't use fuses. Such human protection is found elsewhere in the power supply design making the fuse unnecessary. Leythos wrote: In article , says... Again, fuses blow after the electronic damage has happened so that the human is not put at risk. This being basic electrical knowledge that even a computer assembler should know. Sorry, the fuse it sized to prevent damage to the lines/devices, not to blow after the device has been damaged (although that may also happen). The fuse is sized to protect some part of the device, be it power lines, transformers, etc.... |
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#33
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In article , says...
Again, fuses blow after the electronic damage has happened so that the human is not put at risk. This being basic electrical knowledge that even a computer assembler should know. Sorry, the fuse it sized to prevent damage to the lines/devices, not to blow after the device has been damaged (although that may also happen). The fuse is sized to protect some part of the device, be it power lines, transformers, etc.... -- -- remove 999 in order to email me |
#34
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One more option to check. Make sure the PSU is set for the correct incoming
voltage. There is a red switch to set for 110/120 or 220/240. "RobW" wrote: Hi all, I have a P.C. that keeps blowing power supply's. It is P4 2.4, Gigabyte GA-8IG100MK Main Board in a "whitebox" of unknown make. Low spec AGP video card 2 x Optical drives 1 x 80gig Seagate Barracuda The last power supply it blew was a Unicase 400W Silent power supply. I has been plugged into a middle of the road surge protector the whole time (which seems to fine.) This has all happened in the same house; however there hasn't been any other power problems. I'm thinking maybe it's the case because the problems happend when the unit is being switched o every time. Anyone else seen something like this? TIA Rob |
#35
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One more option to check. Make sure the PSU is set for the correct incoming
voltage. There is a red switch to set for 110/120 or 220/240. "RobW" wrote: Hi all, I have a P.C. that keeps blowing power supply's. It is P4 2.4, Gigabyte GA-8IG100MK Main Board in a "whitebox" of unknown make. Low spec AGP video card 2 x Optical drives 1 x 80gig Seagate Barracuda The last power supply it blew was a Unicase 400W Silent power supply. I has been plugged into a middle of the road surge protector the whole time (which seems to fine.) This has all happened in the same house; however there hasn't been any other power problems. I'm thinking maybe it's the case because the problems happend when the unit is being switched o every time. Anyone else seen something like this? TIA Rob |
#36
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Fuses are rated by amps and time and are intended to open
the circuit before the wires emits smoke. In other words, the fuse must blow before a fire starts. There are fast fuses that protect some electronic circuits in devices such as the resistance (ohms) circuit in a voltmeter. There are also slow-blow fuses for use with motors. There are ground fault detectors and there are Hall Effect sensors which can detect problems in circuits. One thing that the OP needs to tell, under what condition and how fast does the PSU blow, does it work at all and sometimes fail, or does it always fail immediately? -- The people think the Constitution protects their rights; But government sees it as an obstacle to be overcome. "Leythos" wrote in message ... | In article , says... | Again, fuses blow after the electronic damage has happened | so that the human is not put at risk. This being basic | electrical knowledge that even a computer assembler should | know. | | Sorry, the fuse it sized to prevent damage to the lines/devices, not to | blow after the device has been damaged (although that may also happen). | | The fuse is sized to protect some part of the device, be it power lines, | transformers, etc.... | | | -- | -- | | remove 999 in order to email me |
#37
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Fuses are rated by amps and time and are intended to open
the circuit before the wires emits smoke. In other words, the fuse must blow before a fire starts. There are fast fuses that protect some electronic circuits in devices such as the resistance (ohms) circuit in a voltmeter. There are also slow-blow fuses for use with motors. There are ground fault detectors and there are Hall Effect sensors which can detect problems in circuits. One thing that the OP needs to tell, under what condition and how fast does the PSU blow, does it work at all and sometimes fail, or does it always fail immediately? -- The people think the Constitution protects their rights; But government sees it as an obstacle to be overcome. "Leythos" wrote in message ... | In article , says... | Again, fuses blow after the electronic damage has happened | so that the human is not put at risk. This being basic | electrical knowledge that even a computer assembler should | know. | | Sorry, the fuse it sized to prevent damage to the lines/devices, not to | blow after the device has been damaged (although that may also happen). | | The fuse is sized to protect some part of the device, be it power lines, | transformers, etc.... | | | -- | -- | | remove 999 in order to email me |
#38
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In article , says...
When a fuse blows in a power supply, a failed component often causes that open fuse. Even shorting all power supply outputs would not blow a fuse. That depends on the power supply design, but in most switched power supply designs you are correct, they can sustain a shorted output for a sustained period. -- -- remove 999 in order to email me |
#39
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In article , says...
When a fuse blows in a power supply, a failed component often causes that open fuse. Even shorting all power supply outputs would not blow a fuse. That depends on the power supply design, but in most switched power supply designs you are correct, they can sustain a shorted output for a sustained period. -- -- remove 999 in order to email me |
#40
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As an industrial electrical designer (large industrial ovens and furnaces) I
always design and fuse for the protection of the device. "w_tom" wrote: And again, fuse designed to blow so that "damage to the lines/devices" created by component failure does not threaten human life. Any device whose destruction can harm humans will be disconnected by fuses and other equivalent 'one shot' devices. The fuse is not installed to protect hardware. In the process of protecting humans, a fuse may protect some hardware - ie a power cord. But fuses are installed to protect humans. Any protected hardware is incidental. When a fuse blows in a power supply, a failed component often causes that open fuse. Even shorting all power supply outputs would not blow a fuse. The concept is called fold-back current limiting. The fuse is for human protection. It blows typically because a component inside the supply has failed. Furthermore many power supplies don't use fuses. Such human protection is found elsewhere in the power supply design making the fuse unnecessary. Leythos wrote: In article , says... Again, fuses blow after the electronic damage has happened so that the human is not put at risk. This being basic electrical knowledge that even a computer assembler should know. Sorry, the fuse it sized to prevent damage to the lines/devices, not to blow after the device has been damaged (although that may also happen). The fuse is sized to protect some part of the device, be it power lines, transformers, etc.... |
#41
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As an industrial electrical designer (large industrial ovens and furnaces) I
always design and fuse for the protection of the device. "w_tom" wrote: And again, fuse designed to blow so that "damage to the lines/devices" created by component failure does not threaten human life. Any device whose destruction can harm humans will be disconnected by fuses and other equivalent 'one shot' devices. The fuse is not installed to protect hardware. In the process of protecting humans, a fuse may protect some hardware - ie a power cord. But fuses are installed to protect humans. Any protected hardware is incidental. When a fuse blows in a power supply, a failed component often causes that open fuse. Even shorting all power supply outputs would not blow a fuse. The concept is called fold-back current limiting. The fuse is for human protection. It blows typically because a component inside the supply has failed. Furthermore many power supplies don't use fuses. Such human protection is found elsewhere in the power supply design making the fuse unnecessary. Leythos wrote: In article , says... Again, fuses blow after the electronic damage has happened so that the human is not put at risk. This being basic electrical knowledge that even a computer assembler should know. Sorry, the fuse it sized to prevent damage to the lines/devices, not to blow after the device has been damaged (although that may also happen). The fuse is sized to protect some part of the device, be it power lines, transformers, etc.... |
#42
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Tom
A fuse does NOT exist purely to save human life.. the fuses inside a hi-fi power amplifier or CB or computer power supply are there to protect circuits.. some will be fast blow, some will be slow blow, and some are thermal types.. Note also that automotive fuses do NOT exist to save human life.. and if you had followed any links on the URL given to you, that would have become patently clear to you too.. -- Mike Hall MVP - Windows Shell/User http://dts-l.org/goodpost.htm "w_tom" wrote in message ... Why did you provide a URL for circuit protection devices? Those are not fuses? Did you assume that because it is a Littelfuse product, then it must be a fuse? Or did you first review the datasheets before posting? Cited are applications for circuit protection devices .... which are not fuses. Circuit protector devices and fuses are not the same device. You have claims a device called TMOV is a fuse. That is wrong. Go back and learn about TMOVs ... "available in 14 and 20 mm disc size with and without a monitor lead (to alert you that the thermal element has opened). The 14 mm parts are rated to 6kA and the 20 mm parts are rated to 10kA." Do you claim these "6,000 and 10,000 amp fuses" would stop electronic damage? Again, fuses blow after the electronic damage has happened so that the human is not put at risk. This being basic electrical knowledge that even a computer assembler should know. "Mike Hall (MS-MVP)" wrote: Take a look at this.. http://www.littelfuse.com/cgi-bin/r....ION=oNm8TFzMb5 Fuses are not just found in domestic, industrial and automotive power supply lines.. |
#43
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Tom
A fuse does NOT exist purely to save human life.. the fuses inside a hi-fi power amplifier or CB or computer power supply are there to protect circuits.. some will be fast blow, some will be slow blow, and some are thermal types.. Note also that automotive fuses do NOT exist to save human life.. and if you had followed any links on the URL given to you, that would have become patently clear to you too.. -- Mike Hall MVP - Windows Shell/User http://dts-l.org/goodpost.htm "w_tom" wrote in message ... Why did you provide a URL for circuit protection devices? Those are not fuses? Did you assume that because it is a Littelfuse product, then it must be a fuse? Or did you first review the datasheets before posting? Cited are applications for circuit protection devices .... which are not fuses. Circuit protector devices and fuses are not the same device. You have claims a device called TMOV is a fuse. That is wrong. Go back and learn about TMOVs ... "available in 14 and 20 mm disc size with and without a monitor lead (to alert you that the thermal element has opened). The 14 mm parts are rated to 6kA and the 20 mm parts are rated to 10kA." Do you claim these "6,000 and 10,000 amp fuses" would stop electronic damage? Again, fuses blow after the electronic damage has happened so that the human is not put at risk. This being basic electrical knowledge that even a computer assembler should know. "Mike Hall (MS-MVP)" wrote: Take a look at this.. http://www.littelfuse.com/cgi-bin/r....ION=oNm8TFzMb5 Fuses are not just found in domestic, industrial and automotive power supply lines.. |
#44
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In article ,
says... As an industrial electrical designer (large industrial ovens and furnaces) I always design and fuse for the protection of the device. As a designer that's worked in the industrial sector for almost 2 decades, I also spec fuses/breakers for the protection of the wiring and device depending on the application. I don't recall ever fusing for protection of personnel. All the breakers in my SD panel in my home are sized based on the wire gauge and not the devices connected to wiring. All of the fuses in the non-switching PSU's I've used and or build were sized to protect the PSU itself (components). Wonder what else he's going to try and tell us this time. -- -- remove 999 in order to email me |
#45
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In article ,
says... As an industrial electrical designer (large industrial ovens and furnaces) I always design and fuse for the protection of the device. As a designer that's worked in the industrial sector for almost 2 decades, I also spec fuses/breakers for the protection of the wiring and device depending on the application. I don't recall ever fusing for protection of personnel. All the breakers in my SD panel in my home are sized based on the wire gauge and not the devices connected to wiring. All of the fuses in the non-switching PSU's I've used and or build were sized to protect the PSU itself (components). Wonder what else he's going to try and tell us this time. -- -- remove 999 in order to email me |
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