GFCI's: Upstream protection Also ?

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 ?
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???? 13/8/2017 12:43 ??, ? Bob ??????:
nope, but if you "cascade" many GFCIs, you have to pick up them correctly, so that a downstream trip doesn't trip the upstream one. So, if for instance in a factory in the main panel you put one with a 30 mA trip current, and downstream another with also 30 mA, you have to pick an upstream "specially" rated so the downstream trip won't affect the upstream breaker.
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Tzortzakakis Dimitrios

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