This article explains it in detail: Learn How To Safely Install a GFCI Outlet at The Home Depot
Yes, you install a GFCI on a 2 wire circuit.
Not if the GFCI breaker is supplying the circuit you are wanting to put the GFCI receptacle into.
Deoends on code you are governed by. In USA, a GFCI outlet or a circuit controlled by a GFCI circuit breaker would be required.
No, it can be on a circuit with conventional outlets.
No, you could use a GFCI circuit breaker instead.
If your spa is connected with a GFCI circuit breaker you will not need the GFCI receptacle.
The term GFCI stands for Ground Fault Circuit Interrupter.
I don't know if you are trying to ask if you can run a 240V panel off a GFCI or run a 120 V sub panel off of a GFCI. Can you clarify please,,,Thanks
You will need an electrician. Tim is probably right in that unless you are knowledgable, call an electrican. Saying that, if you are knowledgable, you must install a GFCI circuit outdoors. This can be tied into an existing circuit if that circuit has no more than 9 existing lights & plugs already connected. Use 12/2 with ground wiring.
Your question is a bit vague, but let's try a two part answer. If you have a GFCI breaker in an electric panel you should only have one connection at the breaker, but the breaker will protect all devices on the circuit. If you are talking about a GFCI outlet, they are equipped to extend the GFCI protection to other non-GFCI outlets by using the proper "output" connection on the GFCI.
A "GFCI" is a ground fault circuit interrupter. For more information see the link below.
No they must be seperated.