On Sat, 12 Aug 2017 17:44:04 -0400, Bob wrote:

Hello,

Concerning the normal GFCI protectors/modules:

Obviously they protect "downstream" like they are designed to.

But does this protection also extend "upstream" ?
If so, to where ?

Thanks,
Bob
No, it does not (generally) extend upstream (back to the source). If
such a device exists it is not common and/or I have not seen one or
heard of one.