How to recognize poor grounding
Symptoms of a missing or weak earth — what they look like, what they sound like, and what they cost to fix.
Grounding is the part of the installation everyone forgets until something goes wrong. Then it’s the only thing they think about.
What “poor grounding” actually means
A safe installation has a low-resistance path from any exposed metal back to the source. “Poor grounding” means that path is either too high in resistance, broken somewhere along the way, or never installed.
Symptoms you can notice without a meter
- A faint tingle when touching a metal appliance (washing machine, oven, boiler).
- The RCD trips on a circuit that has no obvious leakage.
- Outlets in older parts of the building have only two pins of contact.
- Network and audio gear hums noticeably.
Symptoms that need a meter
- Loop impedance higher than expected for the breaker size.
- Earth resistance above 10 Ω at the rod (in most domestic setups it should be a few ohms).
- Floating neutral — voltage between earth and neutral that isn’t close to zero.
How we measure it
We use a calibrated earth resistance tester with the spike-and-stake method, plus loop impedance from each circuit. Test takes about 30 minutes for an apartment, longer for a house.
When you need to act
If you feel a tingle, stop using the appliance and call. That’s the one symptom that crosses from “inconvenience” to “risk” without warning.