WIRING SCHEMES AND GROUNDING Electrical Distribution SystemsWiring Schemes And Grounding SummaryTerminologyAmpacity - current-carrying capacity of a conductor in amperesBond - permanent joining of metallic parts or circuits assuring electricalcontinuityConductor - any wire, cable, or substance capable of carrying an electricalcurrentGround - a conducting connection between a circuit or piece of equipment andthe earth, or some body serving as earthGround voltage - the voltage between any given conductor and any point atground potentialLeg - a current-carrying conductor intended to deliver power to or from a loadNeutral - a current-carrying conductor intended to deliver power to or from aload normally at an electrical potential other than groundPhase voltage - the greatest root mean square (effective) difference of potentialbetween any two legs of the circuitTwo methods to connect single-phase loads to a three-phase system are:Phase-to-phasePhase-to-groundThe purposes of the following wiring schemes are:3-wire, single-phase Edison system - the only approved method of wiring single-phase power3-wire, three-phase Delta system - normally used for transmission of power inthe intermediate voltage class from approximately 15,000 volts to 600 volts4-wire, three-phase Delta system - combines the ungrounded Delta for three-phase loads with the convenience of the Edison system for single-phase loads4-wire, three-phase Wye system - the safest possible multi-purpose distributionsystem for low voltageES-15 Page 28 Rev. 0
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