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post #31 of 88
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It is true, AC shock is nothing like static, sometimes i got static shock when my arm hair touch my friend's, it is just 'tick', shock coming from my computer / my speaker amplifier is stronger than that, i always got surprised and withdraw my hand quickly. That's why i installed a carpet for my feet, as long as it doesn't touch the floor directly i won't get shocked.

I'll still ask the owner to install the ground, the old PSU also the same (USB / case shock me if i touch it), also my old CRT, speaker amplifier. I never bother to ask for grounding because i don't know if it will affect the computer life, and i have been careful not to touch electronics' metal part when standing/touching directly to floor / wall, but there is a time when i forgot it so i got shocked.
Maybe i have to see doctor after getting shocked so much biggrin.gif
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post #32 of 88
Quote:
Originally Posted by libreorca View Post

It is true, AC shock is nothing like static, sometimes i got static shock when my arm hair touch my friend's, it is just 'tick', shock coming from my computer / my speaker amplifier is stronger than that, i always got surprised and withdraw my hand quickly. That's why i installed a carpet for my feet, as long as it doesn't touch the floor directly i won't get shocked.

I'll still ask the owner to install the ground, the old PSU also the same (USB / case shock me if i touch it), also my old CRT, speaker amplifier. I never bother to ask for grounding because i don't know if it will affect the computer life, and i have been careful not to touch electronics' metal part when standing/touching directly to floor / wall, but there is a time when i forgot it so i got shocked.
Maybe i have to see doctor after getting shocked so much biggrin.gif

 

Yeah, your doctor might be shocked and wonder just what you've been doing!

 

I couldn't resist.

It's a computer!
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post #33 of 88
Its the Amperage that kills, and even though voltage burns are a real possibility, they're very unlikely (in my industry).... and the difference between static shock and actual electrocution is huge, there is no way to mistake one for the other. I have been electrocuted almost a dozen times throughout my childhood ( living in a European country that had poor electrical standards at the time ). Many of the plugs I used were not earthed either and I can tell you its a fine line between things working and burning out.

OP if you notice that this problem occurs when all other sockets are in full use, and if you get shocked repeatedly... I am positive its an earthing problem. DO NOT RISK A GOOD PC. I was in Indonesia recently biggrin.gif but I didn't notice any problems with my electric gear..... I became a qualified tester and tagger recently thumb.gif and would recommend a continuity test.

Earthing electrical equipment/cables is not hard but I would recommend leaving that to professionals
Quote:
to a point voltage makes a difference. and what can happen is it is only makeing enough contact for a small amount of voltage or amperage to come through however either way it is an accident waiting to happen

what he described ( every time he touches his key board ) not every time he gets up and walks around
I agree with this. He is not rubbing his feet and touching the PC constantly.
Quote:
Yep! It's the same as how we can kill an electronic device or a simple PCB because we are electronic devices - albeit extremely advanced and extremely complex.
Get those static bands on mate!! biggrin.gif
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post #34 of 88
Quote:
Originally Posted by SeD669 View Post

Its the Amperage that kills, and even though voltage burns are a real possibility, they're very unlikely (in my industry).... and the difference between static shock and actual electrocution is huge, there is no way to mistake one for the other. I have been electrocuted almost a dozen times throughout my childhood ( living in a European country that had poor electrical standards at the time ). Many of the plugs I used were not earthed either and I can tell you its a fine line between things working and burning out.

OP if you notice that this problem occurs when all other sockets are in full use, and if you get shocked repeatedly... I am positive its an earthing problem. DO NOT RISK A GOOD PC. I was in Indonesia recently biggrin.gif but I didn't notice any problems with my electric gear..... I became a qualified tester and tagger recently thumb.gif and would recommend a continuity test.

Earthing electrical equipment/cables is not hard but I would recommend leaving that to professionals
I agree with this. He is not rubbing his feet and touching the PC constantly.
Get those static bands on mate!! biggrin.gif

 

Those anti-static wristbands only work if they are attached to something that is grounded. Too many people make the mistake of unplugging their PSU and then attaching the anti-static wristband to their computer. As you know - but not enough people do - a computer case can only be grounded if the PSU is still plugged into a grounded outlet. The PSU's switch must also be in the 'off' position for safety.

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post #35 of 88
Quote:
Originally Posted by Mega Man View Post

you can also get shocked by dc voltage ( stick your tongue to a 9v batt ) that wont affect your hear because it passes from the batt. to your tongue to the batt. but if it goes through your heart again it can cause problems. remember you are a computer, your nerves are wires, and your muscles are motors, brain is cpu. all using voltage it is bad to get shocked 30v ( or is it 32 idr ) is considered low voltage and safe, but also your pc has a very large power supply which is bad for you even 12vx60a is bad.
You might be right BUT DC Voltage is also pretty dangerous as well. 12V if you work it out is just tingling on wet skin even BUT doesn't matter how many amps a power supply can source humans still won't be endangered
It actually takes 100V on 1kohms to pass dangerous current. Wet skin by the way is 10k ohms, dry skin is 1M ohms roughly
Quote:
Originally Posted by libreorca View Post

It is true, AC shock is nothing like static, sometimes i got static shock when my arm hair touch my friend's, it is just 'tick', shock coming from my computer / my speaker amplifier is stronger than that, i always got surprised and withdraw my hand quickly. That's why i installed a carpet for my feet, as long as it doesn't touch the floor directly i won't get shocked.

I'll still ask the owner to install the ground, the old PSU also the same (USB / case shock me if i touch it), also my old CRT, speaker amplifier. I never bother to ask for grounding because i don't know if it will affect the computer life, and i have been careful not to touch electronics' metal part when standing/touching directly to floor / wall, but there is a time when i forgot it so i got shocked.
Maybe i have to see doctor after getting shocked so much biggrin.gif
Static shock is a momentary shock because your body's skin is essentially a capacitor. Blood is the dielectric and something else internal is the other voltage plate, rubbing stuff against carpets and such lets electroncs charge up in your body and when contact with metals in super dry weather can cause 10kV shocks BUT that's only for 1-2mS or probably 100s of uS
Still will blow bare CPUs up though even if Intel has stated that they have internal ESD protection but they recommend installing CPUs in dry weather with a ESD strap (Basically 1Mohms to ground) but there's no need to go overkill for a ESD mat. Which i have but that's what i stocked myself up for electronics smile.gif
Quote:
Originally Posted by SeD669 View Post

Its the Amperage that kills, and even though voltage burns are a real possibility, they're very unlikely (in my industry).... and the difference between static shock and actual electrocution is huge, there is no way to mistake one for the other. I have been electrocuted almost a dozen times throughout my childhood ( living in a European country that had poor electrical standards at the time ). Many of the plugs I used were not earthed either and I can tell you its a fine line between things working and burning out.
Wrong mate ... Amperage doesn't kill you. Ohms law does with high voltage smile.gif I live in a 240V country and know just how painful getting shocked can be and obviously until you let go it's a pulsating (obviously) shock that lasts.
Don't see how anyone can NOT tell the DIFFERENCE though
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post #36 of 88
Quote:
Wrong mate ... Amperage doesn't kill you. Ohms law does with high voltage smile.gif I live in a 240V country and know just how painful getting shocked can be and obviously until you let go it's a pulsating (obviously) shock that lasts.
Don't see how anyone can NOT tell the DIFFERENCE though
I will have to disagree my friend.


I = V / R

where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current

Even though the voltage is directly proportional... the ohms or R is a constant... its only affected by the voltage or amperes being turned up or down.
I've literally just finished a course in Occupational health and safety in regards to electrical installation tongue.gif
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post #37 of 88
Quote:
Originally Posted by SeD669 View Post


I will have to disagree my friend.


I = V / R

where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current

Even though the voltage is directly proportional... the ohms or R is a constant... its only affected by the voltage or amperes being turned up or down.
I've literally just finished a course in Occupational health and safety in regards to electrical installation tongue.gif

 

You'll be a good teacher because I understood all of this and I have been awake for almost 18 hours now.

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It's a computer!
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post #38 of 88
Quote:
Originally Posted by SeD669 View Post

I will have to disagree my friend.


I = V / R

where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current

Even though the voltage is directly proportional... the ohms or R is a constant... its only affected by the voltage or amperes being turned up or down.
I've literally just finished a course in Occupational health and safety in regards to electrical installation tongue.gif
No this is all wrong. Again, i never talked anything about resistance. You CANNOT turn up current but YOU CAN turn up voltage. A circuit drawing 8amps cannot magically draw 10amps (Sometimes, coefficients) without increasing the voltage and also current is affected by both voltage and resistance and not the other way round
So no AMPS DONT KILL YOU, OHMS LAW DOES. If not go on EEVBlog and argue your point
A 200mA 220V circuit will kill you the same way 10amp 220V circuit will ONLY if your body's resistance is low enough.
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post #39 of 88
We can only agree to disagree. Ohms law cannot kill anyone. It is just a law lol. A law is not a physical thing.. its a rule. You may be thinking of ohm's which is a measurement of resistance. Since that is a constant you have to assume that either voltage or amperage is what kills. The amps dont "magically" change but they do in relation to the voltage. Voltage goes up means more amps. If the resistance is high enough that means the voltage will be high and the amps can still remain low (refer to the formula). So logic dictates if the resistance in your body is low... the voltage can be low for the amps to be quite high. The lower the resistance the less voltage is divided by the ohms right?? Which means high amps. I could be mistaken my friend and I think this is a discussion for a separate thread. We can both agree that no earth = bad time for the OP right? OP disregard this convo, all you need to know is earth is important and dont just keep trying new PSU's. Look into this issue carefully
Odin
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Odin
(20 items)
 
Tyr
(15 items)
 
 
CPUMotherboardGraphicsGraphics
Intel i7 - 3930k sabertooth x79 GTX 580 GTX 580 
RAMHard DriveHard DriveHard Drive
8GHz Patriot-S kit (2 x 4GHz) OCZ Vector SSD 2TB Seagate 2TB Seagate 
Hard DriveCoolingCoolingOS
500 GB external Seagate Antec 620  2 x Antec Case Fans, 3 x Noctua NF-F12 Fans, 3 ... Windows 7 
MonitorKeyboardPowerCase
LG Flatron W2753VC TT eSports  Antec HGC 900 Antec P280-W 
MouseMouse PadAudioAudio
CM Storm Sentinel Zero-G Shattered Horizon Edition Star Craft 2 - Heart of the Swarm Edition Logitech Z906 5.1 Surround sound  Steelseries Gaming Headphones 
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post #40 of 88

We're talking about facts, not opinions. Who's correct here? I mean, isn't agreeing to disagree reserved for opinions?


Edited by TwoCables - 4/11/13 at 3:22pm
It's a computer!
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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