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  • Users: EETD
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  1. EETD

    Ductbank EGC's

    Hi All, I am designing a 5kV distribution system in underground ductbank, utilizing single-conductor, shielded phase conductors with an equipment grounding conductor included with each parallel set. System is low resistance grounded. Are the equipment grounding conductors required to be the...
  2. EETD

    Overhead vs. Underground Distribution

    lmbt, I believe the main substation transformers are each 25MVA 69/4.16kV. There are several secondary unit-subtations connected to this system ranging from 750 to 2000kVA, 4.16kV/480V. There are several large 4.16kV motor loads ranging from 250Hp to 6000Hp. Largest Motor Loads: - 2-4000Hp...
  3. EETD

    Overhead vs. Underground Distribution

    Marmite & Laplacian, My apologies. The installation is part of a plant expansion project, so it would be an entirely new distribution system. Thank you for your opinions. Regards, EETD
  4. EETD

    Overhead vs. Underground Distribution

    Hi all, I have a client who wishes to consider the cost change associated with changing from underground distribution to overhead for the following system: 1)Utility Transmission Voltage, 69kV 2)Plant Distribution Voltage, 4.16kV 3)Main Plant Switchgear: - Main/Tie/Main (N.O. Tie) - 4000A...
  5. EETD

    EGC Sizing / Parallel Sets

    Thank you dpc and resqcapt19 for your input. I like the option of using 4/C cables. We'll just have to make sure the incoming section at the MCC can handle the cabling. And, I'll be sure to review 240.21(C)! Thanks, EETD
  6. EETD

    EGC Sizing / Parallel Sets

    Help needed in sizing equipment grounding conductor when cable are installed in parallel, in cable tray. Setup: Ambient Temp Max. 30C Seconday Unit-Substation Pri OCPD: 4,160V Fused Switch, 300E Fuse XF Pri Feeder: 3/C-250kcmil w/ #3 Gnd, MV-90 XF: 1500kVA, 480Y/277V, 5.75%, Dry XF Sec Feeder...
  7. EETD

    Obsolete Fluorescent Lamps

    A while back I had heard a rumor that one of the styles of fluoresecnt lamps was going to become obsolete in the near future. (T8 or T12) Does anyone know any facts about this? Thanks for the help.
  8. EETD

    Generator Operation

    Thanks everyone for your responses. They have been very helpful. EETD
  9. EETD

    Generator Operation

    I am applying a 600kW primary service diesel generator at a manufacturing factility with an 8 to 10 hour production shift. A small load (i.e. 30 to 60kW) would need to be maintained for the remainder of the day. In general, when the facility is not in operation (16 hours a day) is it better...
  10. EETD

    Distribution for 415V/50Hz supply

    Hello all, I am working on a project in South America in which the supply will be 415V/3Ph/50Hz, 4-wire. The requirement has been made that lighting and control system loads (i.e. motor starters, I/O, etc.) should be at 110V. In the states I am used to using a 3Phase 480-208Y/120 transformer...

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