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  1. Delta Transformer to WYE without Center Tap

    General Electrical Discussion
    I have a 600v->240v 250kVA 3 wire delta transformer with no center tap. This is a great transformer for my use case but I'd really like to get a neutral so I can pull 120v without having to run a whole separate set of panels to do 208/120. As I mentioned, there is no center tap so I was...
  2. 240v 3 phase corner grounded delta and 240v single phase loads

    Commercial Electrical Forum
    I am trying to figure out if powering 240v single phase loads will work with a 240v 3phase corner grounded delta system. The system is a 240v 3phase corner grounded delta system with "B" phase intensionally grounded. I have multiple 240v single phase loads and (1) 240v 3 phase load. I know...
  3. Problems with step up delta wye transformer

    Commercial Electrical Forum
    Hello all. New to the forum but have a question probably easily explained by the great members here. I wired a step up transformer for a new marble saw for a marble shop. 120/208Delta - 400/231Wye The saw is speeding up its RPMS and causing the saw to shutoff it self --randomly throughout the...
  4. Corner grounded Delta

    General Electrical Discussion
    What is the purpose of a corner grounded delta configuration? It seems pointless. I was checking out a friend's new storefront that used to house a lumberyard. His son, who he said is an electrician, had setup a subpanel feeding mostly 120v receps, etc. It wasnt until he ran everything that he...
  5. Star Or Delta Motor

    General Electrical Discussion
    Our existing equipment in factory used the following spec of 3 phase motor. 5.5kW 415/S 1430/63 RPM Now the above "Star" motor was damaged, can we change it to the following spec of 3 phase motor? 5.5kW 415/D 1400/63 RPM Thanks.:):)
  6. Star-Delta Motor Starting Polarity.

    PLCs, VFDs, Motors and Controls
    Have a 6 lead motor that is intended for wye-delta starting, but there are two leads labeled T1, T2, T3, and no T4, T5, or T6. Does the polarity of the windings matter. I believe it does, but there has been some discussion about it among coworkers. If it does matter, how would I determine the...
  7. Delta transfomer with neutral?

    General Electrical Discussion
    so here is the deal we have a jbox that has 3phases plus a neutral. out of the jbox we are feeding our delta transfomer. Since the xfrmr does not need a neutral on the primary. I wanted to abandon the neutral at the jbox , my toolie wants to pull it along with the other wires and land it at...
  8. Delta transformer with neutral??

    Commercial Electrical Forum
    so here is the deal we have a jbox that has 3phases plus a neutral. out of the jbox we are feeding our delta transfomer. Since the xfrmr does not need a neutral on the primary. I wanted to abandon the neutral at the jbox , my toolie wants to pull it along with the other wires and land it at...
  9. Delta transfomer being fed with neutral

    Services and Service Equipment
    so here is the deal we have a jbox that has 3phases plus a neutral. out of the jbox we are feeding our delta transfomer. Since the xfrmr does not need a neutral on the primary. I wanted to abandon the neutral at the jbox , my toolie wants to pull it along with the other wires and land it at...
  10. Help with formula sheet

    General Electrical Discussion
    I am currently a student going into the industrial electrical field. I am working on a formula sheet that will help me, and a few other students. Could I have someone go over the following and let me know if there is anything else I am missing or anything that might be wrong? Here is a link to...
  11. delta 480 and 120

    General Electrical Discussion
    Hi there, I deal with a lot of low voltage and controls, so my confidence shrank a bit when i discovered that my voltmeter in fact wasn't broken, and i was dealing with corner grounded 480. And furthermore that the 120 in the old equipment is actually from a local transformer. This is part of an...
  12. Running 75% capacity on 208v stinger leg to neutral

    Commercial Electrical Forum
    I have read so many mixed reviews on this subject. I wanted to run this past all you brilliant electricians out there. Is this going to burn up the POCO transformer? How long will it take? The chicken farm / horse ranch I work on has a 4-wire three phase 240v delta system with a high B leg of...
  13. Using a 480 vac with a 240vac load

    General Electrical Discussion
    Has any ever used a 3 phase 480 delta to power 3 240 loads, If so how did you hook up the load to the delta and how did you protect the loads if one of the loads across one delta opened? this is a non-motor load. If any has any suggestion. please post them Thanks, Vaughn
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