The computer case is safe to use, only causing shocks occasionally
The computer case is safe to use, only causing shocks occasionally
I faced this problem for a long time. Each time I touch the case it gives a shock. At first I thought it was my PC, since it was my first build, so I looked inside and checked things like loose connections and dangling cables. It would work for a while, but after a week or two it started happening again. I recall seeing something similar with an iMac when it was connected to a surge protector. But I’m not sure it’s the same, because my PC ran perfectly without any attempts to damage me for months, even with that surge device. Here’s what I did to try fixing it: 1. Unplug and reset switch 2. Secure any loose cables behind the case 3. Push the 24-pin connector all the way in 4. Disconnect the unused hard drive connected via a bent daisy chain cable 5. Take out the rarely used speakers Maybe there are more steps I missed.
If it were grounded, you wouldn’t experience a shock. The shock comes from leakage current that follows the path to ground, and without a correctly connected outlet, it can travel through anyone touching it. Ensure your power cable is properly grounded, including any surge protector you’re using. A 3-prong outlet doesn’t guarantee a real ground connection. You can purchase wall outlet ground testers for around $10 to verify proper grounding. With a multimeter, set it to high AC voltage and place the red probe on the hot wire while the black probe connects to the ground. If grounded, you’ll see the same reading as with hot and neutral (typically 110-120V in the Americas or 220-240V elsewhere). Otherwise, remove the cover plate and check the socket for a third ground wire, making sure to turn off the power breaker first to avoid any risk.
It might be related to the surge protector, since connecting the PSU directly to the wall socket resolved the issue. Testing duration was likely too short. Regarding safety, yes, it’s important to ensure return current flows through neutral, not ground, to prevent electrical hazards.
Probably the surge protector then. Not really. You'll always have some leakage current. As far as I know it is often caused by the EMI filtering in the power supply. The EMI filtering is trying to dump that current to ground but in the absence of a direct path to ground it will go through the case since the case and whatever path it can take to ground. It's typically a very low current (a few mA at most) but because it's a higher voltage you still feel the shock. It's annoying but harmless, just like getting a static electric shock when you touch something. It's more of an issue for the PC if there were a short or surge if it's not grounded.