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  • Ground (fault) detection detectors for ungrounded systems
    The 277V on an ungrounded system is from the capacitance in the transformer, it will provide enough leakage current to give you 277V to ground on each phase In fact, a 480V delta transformer may do the same because of the leakage capacitance in the transformer The same light system will work but only if there is some load
  • Identification of Ungrounded Conductors | Information by Electrical . . .
    (C) Ungrounded Conductors Conductors that are intended for use as ungrounded conductors, whether used as a single conductor or in multiconductor cables, shall be finished to be clearly distinguishable from grounded and grounding conductors Distinguishing markings shall not conflict in any manner with the surface markings required by 310 11(B)(1)
  • Ungrounded Wye | Information by Electrical Professionals for Electrical . . .
    In reviewing some field notes and pictures from a plant where we are doing some unrelated control system work I noted that the site's existing 1200A service (480V) appears to be ungrounded wye The plant operator had noted to me in a visit that the electrical dist was ungrounded delta, and I
  • Colors for Ungrounded Conductors | Information by Electrical . . .
    For example green could be used as a ungrounded conductor before the 2005 code and at one time gray could of been a hot conductor There are required colors for neutrals, and EGC, in Art 200 and 250 What the code does say for building with more than one nominal voltage, choose colors, and post what you use
  • ungrounded delta primary ? | Information by Electrical Professionals . . .
    An ungrounded primary requires a transformer with two primary bushings View attachment 2575417
  • Ungrounded delta system | Information by Electrical Professionals for . . .
    The frst ground fault makes the ungrounded Delta into a Corner Grounded Delta, so the plant continues to run If a phase opens, that is still a phase loss Per the NEC, you need either GROUND FAULT MONITORING, OR you need to use a Corner Grounded Delta system
  • Ungrounded Vs Grounded Inverters | Information by Electrical . . .
    Ungrounded systems are prohibited from using white or gray as colors for wire or wire re-identification These colors are reserved for the grounded conductor Red(+) and black(-) is the recommendation for ungrounded conductors Ungrounded systems should not require a GEC, and a correct inverter wouldn't even have a terminal for it
  • Ungrounded Delta 480V 3-Phase 3-Wire System
    I have a project where the existing pad mounted utility transformer is configured as delta-delta The utility company says it is an un-grounded delta secondary at 480V 3-phase 3-wire system I asked them to take voltage readings between phase-phase and phase-ground just to make sure it is an
  • Ungrounded Delta Ground Fault Through a Transformer
    The transformer feeding the MCC is an ungrounded delta, the transformer that is fed from the MCC feeds a 120 240V panel from a single phase transformer I assume the motor in question was having issues with only one phase going to ground otherwise we'd have a phase to phase issue which i can only assume would have caused MUCH bigger issues
  • Re-Identifying UNgrounded conductors | Information by Electrical . . .
    For years I have not allowed an installation where the UNgrounded conductors smaller than #4AWG have been re identified Now years later one of my guys is making that call and I am trying to back him up but I'm having trouble finding a code to back this up I have been through sections 310 110





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