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Not if the GFCI breaker is supplying the circuit you are wanting to put the GFCI receptacle into.
Yes you can. Lots of blow dryers have GFCI protection built in.
In a word NO, that will not cause either GFCI to trip. The correct term is GFCI (Ground Fault Circuit Interrupter)
my gfci trips when my christmas lights r on and it rains is the gfci bad or is this normal of a perfectly working gfci
Socket A.
A GFCI trips when it detects a difference in the amperage going to the outlet and what is coming back. Even 4-6 miliamps difference will trip the outlet.
GFCI Breakers are quite a bit more expensive than a GFCI outlet. More often than not a typical residence will need only a handful of GFCI outlets that combined together will be cheaper than a GFCI breaker. If you need to protect a series of outlets with GFCI protection you can simply connect the rest of the outlets on that same circuit downstream from the first outlet on the line and make that the GFCI. All you have to do is connect all the other outlets to the LOAD side of the GFCI outlet. If a GFCI fault occurs in any of the outlets down stream they will trip that very first GFCI plug you placed and keep you safe.
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.
Socket 423
Ground fault circuit interrupter. Turns off the the power to the outlet, when the there is a leakage in current. example when you stick your finger in the outlet and the current leaks threw your body
The trip time for a GFCI is from 15 to 30 milliseconds.
GFCI receptacle are designed to trip on 5 milliamps.