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#61
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An old horse story!
I was doing T.V. repair in the 60's. There was a new high rise in Fort Lee, NJ. One of our technicians was up on the 9th floor working on a woman's console T.V. (friggin HUGE). He was squatting down behind the set - the power was off. He accidentally touched the 2nd anode on the CRT. His legs convulsed and sprung him backward, through the open sliding balcony doors and over the rail to his death! He was my friend. -- Regards, Richard Urban aka Crusty (-: Old B@stard :-) If you knew as much as you think you know, You would realize that you don't know what you thought you knew! Vanguard wrote in message ... "Leythos" wrote in message ... Most computer PSU's use CAPS on the DC side and they don't have more than 20+ VDC on most of them, the caps will also discharge in a short amount of time due to the way a PSU is designed. It is not so much of getting a small shock, if any. It is usually more the case of causing physical damage to yourself due to the involuntary quick withdraw of your hand. Getting a shock often doesn't do much harm when working on electronics, but you've spent 5 minutes winding your fingers, hand, and arm in amongst all the cords and components, some of which have barbs or sharp edges. When you get shocked, you withdraw in a straight line and drag your skin across all those jaggies. The shock didn't hurt you. You hurt your because of your reaction the the shock. The bzzzt or buzz might not hurt, but your hand or arm might look like you had a fight with a feral cat. I'd give the PSU about 10 minutes to discharge, and that is WITH the power cord connected to the computer and to the outlet. If the OP is sucking out an excessive amount of current, there is also a good chance that some parts are hot inside. -- __________________________________________________ __________ ** Post your replies to the newsgroup - Share with others ** For e-mail Reply: remove "DELETE", add "~VN56~" to Subject. __________________________________________________ __________ |
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#63
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I would have wanted to have the motor draw too much current, and run for
another minute. That could be the difference between a massive explosion and loss of human life OR the opportunity for the plant personnel to vacate! -- Regards, Richard Urban aka Crusty (-: Old B@stard :-) If you knew as much as you think you know, You would realize that you don't know what you thought you knew! "Leythos" wrote in message ... In article , says... Hell. There were times in my past career when I would not even fuse a 10HP 440/460V motor. I would rather have it burn up than have a fuse blow at an inopportune time. Example: an emergency ventilator in an explosive atmosphere. When the LFL (lower flammability limit) reached 7.5% that motor came on and ran until the environment was again safe or the motor destroyed itself because of "whatever"! That's not right, if the motor is drawing too much current, there is a reason, and continued running will generate excessive heat, which is worse on a vent for an explosive environment. Heck, even the heaters could kick-out a motor before the fuses did in some cases - where the fuses were sized wrong. -- -- remove 999 in order to email me |
#64
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Another human life saved.. wow..
-- Mike Hall MVP - Windows Shell/User http://dts-l.org/goodpost.htm "Leythos" wrote in message ... In article , Vanguard says... "J-Dee" wrote in message ... im from UK and every power cable has to have a fuse in UK so suppose it depends where your from. if you use fuses it could well be a problem. If that is true then the fuse needs to be the slow-blow type. The sudden burst of amps surging through a normal fuse could easily blow it when the computer is powered on. The slow-blow fuse will prevent it from opening for a short one-time surge. However, if the fuse in the power cord blew then the OP would be asking why he has to keep replacing power cords or the fuses in them. He is saying that he is replacing PSUs. Even if he replaced the PSU, it wouldn't work until he replaced the power cord fuse, so he would've still mentioned having to replace fuses. Doesn't sound like it is a fuse problem. Actually the OP stated, later, that he found a fuse blown inside the PSU once he opened it. -- -- remove 999 in order to email me |
#65
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Another human life saved.. wow..
-- Mike Hall MVP - Windows Shell/User http://dts-l.org/goodpost.htm "Leythos" wrote in message ... In article , Vanguard says... "J-Dee" wrote in message ... im from UK and every power cable has to have a fuse in UK so suppose it depends where your from. if you use fuses it could well be a problem. If that is true then the fuse needs to be the slow-blow type. The sudden burst of amps surging through a normal fuse could easily blow it when the computer is powered on. The slow-blow fuse will prevent it from opening for a short one-time surge. However, if the fuse in the power cord blew then the OP would be asking why he has to keep replacing power cords or the fuses in them. He is saying that he is replacing PSUs. Even if he replaced the PSU, it wouldn't work until he replaced the power cord fuse, so he would've still mentioned having to replace fuses. Doesn't sound like it is a fuse problem. Actually the OP stated, later, that he found a fuse blown inside the PSU once he opened it. -- -- remove 999 in order to email me |
#66
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In article ,
says... An old horse story! I was doing T.V. repair in the 60's. There was a new high rise in Fort Lee, NJ. One of our technicians was up on the 9th floor working on a woman's console T.V. (friggin HUGE). He was squatting down behind the set - the power was off. He accidentally touched the 2nd anode on the CRT. His legs convulsed and sprung him backward, through the open sliding balcony doors and over the rail to his death! He was my friend. That's terrible, worst incident of appliance shocking I've ever read. Sorry for your loss. When I worked on 14kv lines, I remove all metal from my person, at least as much as possible. We had a couple incidents where people were racking in switch-gear and crossed the stabs and made a real big mess, but I wasn't around then. We even had a contractor vacuuming a 14kv unit after they had drilled holes in the panels/sides - the dust arced against the bus bars... He had copper colored safety glasses and burns on his arms/face. I've also seen contractors cut conduits that were suppose to be safed, only to have the 440 still be hot. One time, when I was new to all of this, I was following an old timer on a motor replacement on an automated system - it was only about 5HP, but he had turned the machine to STOP (not power off) and told me to just go ahead and wire the pecker-head. Being young, stupid, and new, I grabbed the three lines, they brushed up against the stair frame and made one heck of a bang. I never followed anyone again without making the system safe (electrical/mechanical) again. -- -- remove 999 in order to email me |
#67
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In article ,
says... An old horse story! I was doing T.V. repair in the 60's. There was a new high rise in Fort Lee, NJ. One of our technicians was up on the 9th floor working on a woman's console T.V. (friggin HUGE). He was squatting down behind the set - the power was off. He accidentally touched the 2nd anode on the CRT. His legs convulsed and sprung him backward, through the open sliding balcony doors and over the rail to his death! He was my friend. That's terrible, worst incident of appliance shocking I've ever read. Sorry for your loss. When I worked on 14kv lines, I remove all metal from my person, at least as much as possible. We had a couple incidents where people were racking in switch-gear and crossed the stabs and made a real big mess, but I wasn't around then. We even had a contractor vacuuming a 14kv unit after they had drilled holes in the panels/sides - the dust arced against the bus bars... He had copper colored safety glasses and burns on his arms/face. I've also seen contractors cut conduits that were suppose to be safed, only to have the 440 still be hot. One time, when I was new to all of this, I was following an old timer on a motor replacement on an automated system - it was only about 5HP, but he had turned the machine to STOP (not power off) and told me to just go ahead and wire the pecker-head. Being young, stupid, and new, I grabbed the three lines, they brushed up against the stair frame and made one heck of a bang. I never followed anyone again without making the system safe (electrical/mechanical) again. -- -- remove 999 in order to email me |
#68
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In article ,
says... I would have wanted to have the motor draw too much current, and run for another minute. That could be the difference between a massive explosion and loss of human life OR the opportunity for the plant personnel to vacate! I would have been afraid that the load could be caused by a shaft bearing or some other physical condition that could lead to sparks/excessive heat. We used double exhaust systems in our grain systems, same in the cement systems, in case one purge system didn't work. -- -- remove 999 in order to email me |
#69
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In article ,
says... I would have wanted to have the motor draw too much current, and run for another minute. That could be the difference between a massive explosion and loss of human life OR the opportunity for the plant personnel to vacate! I would have been afraid that the load could be caused by a shaft bearing or some other physical condition that could lead to sparks/excessive heat. We used double exhaust systems in our grain systems, same in the cement systems, in case one purge system didn't work. -- -- remove 999 in order to email me |
#72
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When I was in Electronic school, courtesy of the Navy, we were in our 3
phase section of training. We each had out own work module and fuse box. After coming back from coffee break one day a young fella a few seats down picks up the three phase leads and says "I wonder if these are hot?". He then touched two of the phases together. He woke up 3 days later in intensive care. -- Regards, Richard Urban aka Crusty (-: Old B@stard :-) If you knew as much as you think you know, You would realize that you don't know what you thought you knew! "Leythos" wrote in message ... In article , says... An old horse story! I was doing T.V. repair in the 60's. There was a new high rise in Fort Lee, NJ. One of our technicians was up on the 9th floor working on a woman's console T.V. (friggin HUGE). He was squatting down behind the set - the power was off. He accidentally touched the 2nd anode on the CRT. His legs convulsed and sprung him backward, through the open sliding balcony doors and over the rail to his death! He was my friend. That's terrible, worst incident of appliance shocking I've ever read. Sorry for your loss. When I worked on 14kv lines, I remove all metal from my person, at least as much as possible. We had a couple incidents where people were racking in switch-gear and crossed the stabs and made a real big mess, but I wasn't around then. We even had a contractor vacuuming a 14kv unit after they had drilled holes in the panels/sides - the dust arced against the bus bars... He had copper colored safety glasses and burns on his arms/face. I've also seen contractors cut conduits that were suppose to be safed, only to have the 440 still be hot. One time, when I was new to all of this, I was following an old timer on a motor replacement on an automated system - it was only about 5HP, but he had turned the machine to STOP (not power off) and told me to just go ahead and wire the pecker-head. Being young, stupid, and new, I grabbed the three lines, they brushed up against the stair frame and made one heck of a bang. I never followed anyone again without making the system safe (electrical/mechanical) again. -- -- remove 999 in order to email me |
#73
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When I was in Electronic school, courtesy of the Navy, we were in our 3
phase section of training. We each had out own work module and fuse box. After coming back from coffee break one day a young fella a few seats down picks up the three phase leads and says "I wonder if these are hot?". He then touched two of the phases together. He woke up 3 days later in intensive care. -- Regards, Richard Urban aka Crusty (-: Old B@stard :-) If you knew as much as you think you know, You would realize that you don't know what you thought you knew! "Leythos" wrote in message ... In article , says... An old horse story! I was doing T.V. repair in the 60's. There was a new high rise in Fort Lee, NJ. One of our technicians was up on the 9th floor working on a woman's console T.V. (friggin HUGE). He was squatting down behind the set - the power was off. He accidentally touched the 2nd anode on the CRT. His legs convulsed and sprung him backward, through the open sliding balcony doors and over the rail to his death! He was my friend. That's terrible, worst incident of appliance shocking I've ever read. Sorry for your loss. When I worked on 14kv lines, I remove all metal from my person, at least as much as possible. We had a couple incidents where people were racking in switch-gear and crossed the stabs and made a real big mess, but I wasn't around then. We even had a contractor vacuuming a 14kv unit after they had drilled holes in the panels/sides - the dust arced against the bus bars... He had copper colored safety glasses and burns on his arms/face. I've also seen contractors cut conduits that were suppose to be safed, only to have the 440 still be hot. One time, when I was new to all of this, I was following an old timer on a motor replacement on an automated system - it was only about 5HP, but he had turned the machine to STOP (not power off) and told me to just go ahead and wire the pecker-head. Being young, stupid, and new, I grabbed the three lines, they brushed up against the stair frame and made one heck of a bang. I never followed anyone again without making the system safe (electrical/mechanical) again. -- -- remove 999 in order to email me |
#74
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In article ,
says... When I was in Electronic school, courtesy of the Navy, we were in our 3 phase section of training. We each had out own work module and fuse box. After coming back from coffee break one day a young fella a few seats down picks up the three phase leads and says "I wonder if these are hot?". He then touched two of the phases together. He woke up 3 days later in intensive care. I was in AT (Avation Electronics Technician) training in Memphis around 84, I saw things like that once in a while during my 3 months there -- -- remove 999 in order to email me |
#75
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In article ,
says... When I was in Electronic school, courtesy of the Navy, we were in our 3 phase section of training. We each had out own work module and fuse box. After coming back from coffee break one day a young fella a few seats down picks up the three phase leads and says "I wonder if these are hot?". He then touched two of the phases together. He woke up 3 days later in intensive care. I was in AT (Avation Electronics Technician) training in Memphis around 84, I saw things like that once in a while during my 3 months there -- -- remove 999 in order to email me |
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