Timeline for Is 'grounding a desktop PC via 1MΩ resistor' unsafe when working inside the case?
Current License: CC BY-SA 3.0
19 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 20, 2019 at 4:33 | comment | added | D.A.S. | 100pF 1M = 100us | |
| May 20, 2019 at 0:49 | comment | added | user222359 | How much time does it take to discharge to safe levels through 1MΩ wrist strap? | |
| Apr 9, 2017 at 15:57 | comment | added | D.A.S. | How many times do I need to repeat myself? Unless your house has no earth ground and you are in the middle of a potential lightning storm. No worries. No NEED. You apparently still don't understand Ohm's law or what I wrote. Read until you do. | |
| Apr 9, 2017 at 15:50 | comment | added | user127725 | @tony-stewart-ee-since-75 Thanks! Indeed, that resistor (between ATX case and mains earth) is not needed for ESD protection. But also no issues regarding user safety? Really? (Because, like i said, i thought: if there should be a resistor between an antistatic mat and mains earth, then you would think there should be a resistor between the ATX case and mains earth too...) | |
| Apr 9, 2017 at 15:22 | comment | added | D.A.S. | "But, should there also be a resistor on the path from the ATX case to mains earth? " For ESD NO NEED. For operating while repairing.. NO ISSUE. EARTH MAINS is neither mandatory nor harmful when using a wrist strap | |
| Apr 9, 2017 at 13:52 | comment | added | user127725 | Reminder: the ground pin (the 3rd pin, next to hot and neutral, on the backside of the ATX PSU) and the PSU case and the ground-plane of the ATX motherboard and the ATX case around these things... all at the same potential. Because: hard linked. | |
| Apr 9, 2017 at 13:46 | comment | added | user127725 | On the drawings i made, you can see the wrist strap being connected to the ATX case. Clearly, you want a resistor on that path. But, should there also be a resistor on the path from the ATX case to mains earth? | |
| Apr 9, 2017 at 13:45 | comment | added | user127725 | "While you are floating with a 1MOhm to nearest conductor other than chassis." Other than the chassis? | |
| Apr 8, 2017 at 20:01 | comment | added | D.A.S. | however , there may be exceptions around the world with poor power protected lines having poor grounds > 100 Ohms and house has no basement plumbing earth ground, but this is faulty. Then you disconnect all PC's during a lightning storm or hurricane or tornado. working on it or not.!! | |
| Apr 8, 2017 at 20:00 | comment | added | D.A.S. | My brother had a house in Uganda once with a coffee plantation (side biz) and lightning power surge (open and reclose unbalanced 3phase) wiped out every appliance in the house from over voltage on his phase. including fridge stove etc but the grounds were good (low Z) and wet.. | |
| Apr 8, 2017 at 19:53 | comment | added | D.A.S. | If transformer ground shifts 1kV plumbing earth ground will aborb this but Line to neutral damage will occur in Florida. While you are floating with a 1MOhm to nearest conductor other than chassis. so yes that's what I'm saying but if Lightning arcs past transformer inside ATX then board gets zapped At no point is the human between flow of ground path current directly to other paths but may feel like zapping a door knob with neoprene shoes. unless disconnected and wriststrap is on power earth gnd vs chassis gnded then capacitance may increase | |
| Apr 8, 2017 at 19:34 | comment | added | user127725 | Are you telling me that when your house ground wire is energized (for example, after lightning striking your house) then your ATX PSU might burn out (if it lacks adequate 6kV transient protection) but your body won't feel a thing? Even if you are touching the house ground wire? | |
| Apr 8, 2017 at 18:45 | comment | added | user127725 | The ground pin (the 3rd pin, next to hot and neutral, on the backside of the ATX PSU) and the PSU case and the ground-plane of the ATX motherboard and the ATX case around these things... all at the same potential. | |
| Apr 8, 2017 at 18:42 | comment | added | user127725 | "No chance of discharge current with Earth ground disconnected or connected." What do you mean? | |
| Apr 8, 2017 at 15:53 | history | edited | D.A.S. | CC BY-SA 3.0 |
added 518 characters in body
|
| Apr 8, 2017 at 15:45 | history | edited | D.A.S. | CC BY-SA 3.0 |
added 518 characters in body
|
| Apr 8, 2017 at 15:40 | history | edited | D.A.S. | CC BY-SA 3.0 |
added 518 characters in body
|
| Apr 8, 2017 at 15:24 | history | edited | D.A.S. | CC BY-SA 3.0 |
added 362 characters in body
|
| Apr 8, 2017 at 15:17 | history | answered | D.A.S. | CC BY-SA 3.0 |