can a GFCI outlet be added to the end of a circuit? if so do you need a 3 core wire? we have tried to install with 2 core wire but it dosent seem to work
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When you say "3 core wire". Do you mean three wires plus a ground (so four total wires), or two wires plus a ground (three wires total)? Are you trying to GFCI protect other devices on the circuit, or just the GFCI receptacle? – Tester101 Mar 10 '16 at 04:19
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Of course, the ground wire or 3rd wire is desirable & preferred. If you can't ground the circuit or can't afford an Electrician to do so or to re-wire the circuit, then it's fine to use. A GFCI will work anywhere & still provides protection without the ground wire. They're specifically approved for ungrounded old homes, but it won't pass a plug-in tester's scrutiny.
Here's a good article on the subject for your understanding.
Iggy
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1it's a good idea to label the outlet "no equipment ground" if there isn't a true ground connection. – ratchet freak Mar 10 '16 at 09:05
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A 3-light plug-in tester deliberately induces a ground fault (to light the hot-ground indicator) so you will not be able to test a GFCI with it. – Harper - Reinstate Monica Mar 10 '16 at 10:04