OSHA 1910.399 defines a ground fault circuit interrupter, or GFCI, as "a device whose function is to interrupt the electric circuit to load when a fault current to ground exceeds some predetermined value, that is less than that required to operate the over-current protective device of the supply circuit." Ground fault circuit interrupter is designed to shut off electric power within as little as 1 /40 of a second. The mechanism compares the amount of current going into the electric equipment to the amount of current returning along the circuit conductors. If the current exceeds six milliamperes, […]
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