GFCI connected to wall via extension cord

[astroboy]

I have a question about GFCIs, the kind that plugs into the wall, but is not mounted inside the wall itself. I have one plugged into an extension cord that has only one outlet. The wall outlet itself is behind a bookshelf and pretty much impossible to get at. It seems to be that since the cord has only a single outlet the GFCI would still work OK but I've read where this is supposed to not be the case. From what I've read the GFCI is supposed to be first, so to speak (plugged into the wall socket) and the extension cord second (connected to the GFCI), although in these posts its not clear if the extension cord has multiple outlets, ie, a power strip, in which case I can see where a GFCI plugged into one of the outlets obviously is not going to give you any protection for the other outlets in the strip. 

 

Any thoughts? Thanks. 

[Origami]

You'll be fine with the configuration you describe.

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