Electrical Systems Unearthed

摘要

INSTALLING AND OPERATING AN UNGROUNDED SYSTEM is typically a combined effort, including the design or engineering team, the owner, the operators and sometimes the authority having jurisdiction. In addition to the Code allowances, common reasons to operate an ungrounded system are providing electrical operation continuity and minimizing downtime. Common ungrounded delta systems include, but are not limited to, 240-volt (V), three-phase, 3-wire, delta-connected; 480V, three-phase, 3-wire, delta-connected; and 2,300V, three-phase, 3-wire, delta-connected.