# Double isolation with earthing symbol inside on power supply

I was looking at my laptop's power supply and i noticed this symbol:

To me totally looks like a "double isolation class 2" IEC 61140 combined with the IEC 60417 - 5018 symbol (Functional earthing; functional grounding), but does such thing exists in any standard? I couldn't find it in IEC 60417.

The negative output of the power supply is connected through a 10kohm resistance to the earth pin of the mains plug (or at least this is what i can measure from the ouside).

• Isn't this breaing the double isolation condition?
• Is the earthing there only for reference?
If that's the case, why bother with the 10k resistor?
• It means Functional earthing; functional grounding (US) The term "functional earth" as used in the standard is only for cases where a special terminal is provided for the user or installer to connect to an external earth, usually for the purpose of noise reduction. – Tony Stewart Sunnyskyguy EE75 May 10 '18 at 11:07
• @TonyStewartolderthandirt This is not the case, no special terminal is used or available – valerio_new May 10 '18 at 11:23

IEC 60065