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The traditional definition of a GFCI is a unit which operates or "opens" a circuit in less than 25/1000 seconds (1/40th of a second) when a leakage of 5mA is detected. This value is shown in the American Electrician's Handbook by Terrell Croft and Wilford Summers, page 4-81 (c. 1987).
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Do gcfi breakers operate with only hot and neutral ?
yes. A GFCI monitors the amount of current flowing from hot to neutral. If there is any imbalance, it trips the circuit.
How many elec outlets can a GFCI detect?
A GFCI can detect ground faults on the specific circuit it is connected to. If multiple outlets are on the same circuit protected by a single GFCI outlet, the GFCI can protect all of them. However, if the outlets are on different circuits or not downstream from the GFCI, they would need their own GFCI protection.
Can you hook up a gfci to a 2 wire system?
There are two sets of terminals on a GFCI. They are labeled LINE and LOAD. Each set has a hot and a neutral. To wire a GFCI to an older two wire system without a grounding conductor, you terminate the hot wire coming from the panel to the line terminal(usually the brass colored one) and the neutral wire to the other one(usually the silver colored one). If there is another set, or sets(black and white) in the outlet box, they terminate on the load terminals respectively. Code requires any GFCI that has no grounding conductor(the bare one in modern wiring), to have the sticker which states no grounding conductor. This sticker comes with a new GFCI. The GFCI will still operate when there is a ground present. Basically, a GFCI monitors the current between the hot and neutral, if there is any imbalance, which would happen if some of the current was going through another grounded means, it will trip, thereby protecting you .
Do all electrical outlets in a garage need to be GFCI?
It is recommended to have GFCI protection for all electrical outlets in a garage to help reduce the risk of electric shocks. This would typically involve installing a GFCI outlet at the beginning of the circuit to protect the rest of the outlets downstream.
If the test switch is bad on a gfci will the breaker still work?
No, if the test switch on a GFCI is faulty, it can prevent the breaker from working correctly. The test switch is an essential component for checking the functionality of the GFCI, so if it's bad, it could impact the overall operation of the device.
