Few things seem to cause as much confusion as three-phase power, especially in a Delta configuration. Contact us for BIG Discounts on large orders. Search using. The need for three-phase supply or service occurs when heavy equipments are present such as large motors beyond 5 HP motorsbecause such large equipments need high starting and running currents. The grounding conductor is sized to safely carry fault current for the short time until the breaker trips - it is also sized to keep the voltage drop due to fault currents in the ground below harmful levels.
A split-phase or single-phase three-wire system is a type of single-phase electric power distribution.
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