Is a surge suppressor useful at all if your room's outlets are not grounded?

---

Hello,

I have bought a surge suppressor a few weeks ago because I was worried of electrical surges damaging my computer. What I did not anticipate was, when I set up the surge suppressor, a little red light turned on telling me that the line was not grounded. So what does that mean, that the surge suppressor will just work as a regular power strip without protecting me from things like thunder?

@thomas-pondant,
If the outlet is ungrounded then a surge suppressor doesn't have a ground to send the surge to away from your equipment. This will create a ground loop.

Also, regardless of the surge suppressor it will only be able to handle so much based on clamping voltage. The better the suppressor is the lower the clamping voltage.