I live in an very very old house, recently I purchase a surge protector (APC P5B-GR) and it came with "grounded" light indicator, when I plug the surge protector into my house wall outlet, the grounded light indicator does not turn on.
Does that mean my house is not properly grounded? How do I check? Is there any risk if your house is not properly grounded?
The surge protector says "This product must be connected to earth ground" in the back. So is it safe to use even if my house is not properly grounded?
Here's a pictures of my house main electrical outlet.
Here's a picture of my wall outlet.
Here's a pictures of my surge protector