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Because something is wrong. Check for shorts and, if it is a GFCI, also check for ground faults and leakages. It is also possible, in the case of a GFCI, that an inappropriate load, such as a computer monitor or UPS, is connected. These devices pull transient power to ground and will trip a GFCI. Do not ignore the situation. The protective device is tripping for a reason.
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
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.
The trip time for a GFCI is from 15 to 30 milliseconds.
GFCI receptacle are designed to trip on 5 milliamps.
If the test switch is faulty then there is no convenient way to determine if the GFCI is functioning, and technically, if the test switch is faulty, then as it is a part of the GFCI, the GFCI is faulty and should be replaced.
Yes, but you can feed multiple outlets from one GFCI outlet. Make the first outlet fed in the cicuit a GFCI. Search for GFCI outlet with Google, etc. and I'm sure you will find an explanantion of how. Most GFCI's come with instructions also.
It is a Ground Fault Circuit Interrupter or GFCI. It can either be equipped in your electric panel as a GFCI breaker, or in a GFCI outlet which also lets you extend the GFCI protection to other outlets "down the line" from the GFCI outlet.