Voltage Indicator FAQ's
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      3. Voltage Indicator FAQ's

      Q: Can the R-3W be used on an ungrounded 3phase application?

      A: Yes the R-3W and other Voltage Indicator PESDs can be used on an ungrounded 3 phase system but you still need to hook the ground wire to an Earth ground. Please see page 14 of the attached installation manual for correct wiring. 

      Installation Guide