Why must ground & neutral be seperate in subpanel?
I believe that GFIs are often recommended in cases where there
is no ground for safety. They do not need a ground AFAIN.
They need the ground wire.
When a ground is available at an outlet with a GFCI it is preferred
(and required) that it be installed,
However, where there is no ground the NEC still recognized that a GFCI
can still provide protection by detecting an imbalance in currents
between the neutral and hot wire. In this case, the user must be
informed (with a small sticker on the outlet) that the GFCI is
ungrounded.
Beachcomber
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