I have some ungrounded receptacles in my house that are GFCI/AFCI protected. I wanted to check if my laptop (power brick) can be safely used on these receptacles. On the power brick I see this information (see screenshot) and the symbol for the appliance class it seems like it is double insulated but there is also a symbol inside that double square and I am not sure what this means (looks like ground?) in combination with the double square? Some online searching did not reveal anything else to me but perhaps on I am searching with the wrong keywords. So my questions are
- What does this symbol mean (outlined in the red in the upper right corner)
- Can I use this in an ungrounded receptacle?