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Earn +20 ptsQ: Why is a GFCI not used everywhere?
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Could you show me an electrical drawing of a circuit with GFCI protecting a switch?
GFCI's are not used to protect a switch they are used to protect an outlet where something is plugged in.
Do you need a gfci outlet if you have a gfci breaker?
Not if the GFCI breaker is supplying the circuit you are wanting to put the GFCI receptacle into.
Can a dimmer switch be used up stream or downstream of a gfci?
Yes
Can a circuit with a GFCI be shared at the box?
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.
Are gfci plugs required in a bathroom?
Deoends on code you are governed by. In USA, a GFCI outlet or a circuit controlled by a GFCI circuit breaker would be required.
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