I recently finished building a PC and noticed that my Belkin surge protector shows a green "Protected" light but also a red "Not Grounded" light. The same warning appears on several outlets throughout this older rental house. I'm not sure whether the outlets were originally two-prong or whether someone installed three-prong outlets without connecting the ground wire. How dangerous is it to use the PC normally in this situation? Could the missing ground damage the computer, create a shock hazard, or make the surge protector ineffective? I plan to notify the landlord, but I'd also like to know whether there's anything safe and practical I can do as a renter in the meantime.
4 Answers
The PC will often run normally without a ground, and the missing ground does not automatically mean it will be damaged immediately. However, the surge protector cannot work as intended for all types of surges, and a fault could make the case or exposed metal dangerous to touch. Until the circuit is checked, avoid using questionable adapters or defeating the ground pin, and keep the system away from damp areas.
The indicator may be useful, but it is not a complete electrical diagnosis. If you want confirmation, have the landlord or an electrician test the outlet and determine whether it has a real equipment ground, reversed wiring, or only GFCI protection. Since every outlet shows the same warning, the problem may affect the whole circuit or house rather than just one receptacle.
Check whether the outlet, or an outlet earlier on the same circuit, has TEST and RESET buttons. A properly installed GFCI can provide shock protection on an old ungrounded circuit, but it does not create an equipment ground. It should be labeled “No Equipment Ground,” and the surge protector’s protection may still be limited because many surge devices divert spikes through the ground connection. Don’t modify the wiring yourself; ask the landlord to have it tested.
First determine what kind of outlet and wiring you actually have. A three-prong outlet with no equipment ground may have been installed incorrectly, while an older two-prong circuit may simply lack a grounding conductor. The landlord should have the circuit inspected by a licensed electrician rather than relying only on the power strip’s indicator.
An ungrounded outlet can also leave the metal PC case energized if the power supply develops a fault, and the breaker may not trip as quickly or reliably as it should. That makes this a safety issue, not just a computer-performance issue.