![]() ![]() The conductor that connects the grounded neutral conductor at service equipment, the building or structure disconnecting means enclosure, or a separately derived systems enclosure to an electrode (earth). A device that establishes an electrical connection to the earth. The conductor that connects equipment to the earth via a grounding electrode.Īuthor’s comment: An example would be the conductor used to connect equipment to a supplementary grounding electrode. The conductor that terminates to the terminal that is intentionally grounded to the earth. A ground-fault current path is simply all of the available conductive paths over which fault current flows on its return to the electrical supply source during a ground fault. ![]() The difference between an “effective ground-fault current path” and “fault-current path” is that the effective ground-fault current path is “intentionally” constructed to provide the low-impedance fault-current path to the electrical supply source for the purpose of clearing the ground fault. An electrically conductive path from a ground fault to the electrical supply source.Īuthor’s comment: The fault-current path of a ground fault is not to the earth! It’s to the electrical supply source, typically the XO terminal of a transformer. An unintentional connection between an ungrounded conductor and metal parts of enclosures, raceways, or equipment. Earth or a conductive body that is connected to earth. Fault current returns to the power supply (source), not the earth! Refer to 250.118 for acceptable types of equipment grounding conductors. ![]() The low-impedance fault-current path used to bond metal parts of electrical equipment, raceways, and enclosures to the effective ground-fault current path at service equipment or the source of a separately derived system.Īuthor’s comment: The purpose of the equipment grounding (bonding) conductor is to provide the low-impedance fault-current path to the electrical supply source to facilitate the operation of circuit overcurrent protection devices in order to remove dangerous ground-fault voltage on conductive parts. The effective ground-fault current path is intended to help remove dangerous voltage from a ground fault by opening the circuit overcurrent protective device.Įquipment grounding conductor. An intentionally constructed, permanent, low-impedance conductive path designed to carry fault current from the point of a ground fault on a wiring system to the electrical supply source. A conductor properly sized in accordance with Article 250 that ensures electrical conductivity between metal parts of the electrical installation.Įffective ground-fault current path. The permanent joining of metal parts together to form an electrically conductive path that has the capacity to conduct safely any fault current likely to be imposed on it.Īuthor’s comment: Bonding is accomplished by the use of conductors, metallic raceways, connectors, couplings, metallic-sheathed cables with fittings, and other devices recognized for this purpose. So let’s review a few important definitions contained in Articles 100 and 250.īonding. Why is grounding so difficult to understand? One reason is because many do not understand the definition of many important terms.
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