Mar 16, 2017 · 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. …

Aug 9, 2020 · I’ve recently realized the station we are working at (additional construction). Operates from 480v ungrounded delta system. As many others I’m sure that I just never knew about than but have …

Nov 17, 2004 · 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 …

Jul 14, 2014 · Ungrouded wye and delta are the same thing. The only thing different is the transformer secondary is wye and left floating rather than delta; everything else is exactly like an ungrounded …

Dec 4, 2020 · An 'ungrounded' system actually does have ground connections, via the ground detection lights (if that is what is used) and via capacitive coupling. As noted when a ground fault occurs you …

Oct 3, 2023 · I have occasion to run across 480v and 240v ungrounded systems in manufacturing facilities that I work at. 240v ungrounded delta if I take a meter phase...

Mar 15, 2012 · We service several older electrical systems that are 480 volt 3 phase systems, some 240 volt systems, that are fed from our Poco by 3 wire ungrounded systems. (I've mentioned this in other …

May 7, 2022 · If the secondary is 240V ungrounded delta, then it should have its own ground fault detectors, yes? If guess if the secondary is grounded, and one of the primary conductors is faulted to …

Jan 13, 2021 · The ungrounded conductors can be whatever you want as long as you identify them (or if the jurisdiction amended the national code) There are a few places in the NEC which require or …

Aug 31, 2024 · A 3P3W system can be either corner grounded or ungrounded. For the corner grounded configuration, we are allowed to use distribution equipment with 2 pole OCPD that only disconnects …