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  1. bceng87SS1517

    Stacking MV Insulators

    Can you stack medium voltage bus support/standoff insulators and get the same voltage rating at the overall height compared to a single insulator at that height. i.e. if I use two 6" insulators instead of a single 12" insulator should the clearance be "derated" at all? Would the BIL be the same?
  2. bceng87SS1517

    50/51 51N/50N time grading on radial feeder

    Need the SC available contribution on line side of breaker #4, then you will need to model the radial feed to include cable size/lengths, breaker types, bus types(swgr or aerial), XFMR nameplate data, type of grounding if either side is has wye windings, resistor size if it is resistively...
  3. bceng87SS1517

    Sensitive Ground Overcurrent on Primary of Transformer

    I've got an application where I have a dedicated substation breaker supplying a single XFMR(D-Y) with a switch on the primary, a secondary main, and a 400A NGR. I am looking to set the primary breaker ground overcurrent as sensitive as possible(thinking instantaneous 50G) without concern of...
  4. bceng87SS1517

    Synchronous motor exciter

    Looking for information on synchronous motor exciters, specifically any books or white papers that review the output waveforms of various packages or anything with good information.
  5. bceng87SS1517

    Single Phase Arc Flash Label Requirements

    Exactly LionKing, thats a lot more data for a large plant which means more time and data, but... is it actually required or is there a standard. ETAP gave the same reference to using IEEE 3 phase for conservative results and then tried to sell me on the single phase module but cant reference...
  6. bceng87SS1517

    Single Phase Arc Flash Label Requirements

    What do you mean based on the incident energy level? Incident energy levels do not determine whether or not a specific device will get a label or not. If a device requires a label you would calculate the incident energy level to determine necessary PPE category, arc flash boundary, and etc. My...
  7. bceng87SS1517

    Single Phase Arc Flash Label Requirements

    Based on the latest NFPA 70E and other latest references/guidelines are single phase panels in industrial facilities required to have arc flash labels?
  8. bceng87SS1517

    Arc Flash Label Requirement Clarification

    So what equipment is actually exempt or can you reference the section of IEEE 1584? Also what actual information are you providing on your generic labels since the NFPA 70E requires them to have specific PPE/boundary data which requires the study be completed? Are you saying that you put...

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