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Recent content by Gr8blu

  1. Gr8blu

    Multiple Sleeve holes in Concrete FDN Wall

    You'll be limited (by code) on how close the different systems can be to one another - and possibly how close you can put different electrical voltages as well. As top orienting the holes to run the conduit vertically - do you want to get called whenever there is a leak and have to pull down...
  2. Gr8blu

    VFD increasing the motor winding temperature

    Really stupid question #1 - did the motor turn the same rotation with utility and drive supplies? With a 2-p machine, chances are good the fan is directions - which means adequate cooling in one direction and not so much in the other. Really stupid question #2 - how is the temperature being...
  3. Gr8blu

    Multiple Sleeve holes in Concrete FDN Wall

    Did the ones asking for penetrations indicate what they were for? My guess, based on number and size, is that these are either for liquid conduit (water, oil, etc.) or electrical (wire inside protective/supporting conduit) or both. If the assumption is correct, the runs are generally...
  4. Gr8blu

    salary rant

    Another factor that plays into the issue is inflation. The OP was hired at some point in the past (5 years or so). The purchasing power of $1 then was about equivalent to $1.25 today - so what should be happening is that a new hire should be receiving $1.25 for every $1 the OP got on his first...
  5. Gr8blu

    Transformer overloading

    CER = Continuous Emergency Rating CMR = Continuous Maximum Rating Continuous Emergency Rating CER transformers are designed to operate at their Continuous Emergency Rating (CER) under emergency loading conditions, such as outages. The CER rating is crucial for ensuring that these transformers...
  6. Gr8blu

    struggling with project

    Step 1: Build a crane tower (use popsicle stick and skewer, with embroidery thread and glue to bind) tall enough to lift bottle about 2 cm above the finish point. Step 2. Grab bottle with a non-stretch material (embroidery thread and popsicle sticks or skewers should work). Step 3. Run some sort...
  7. Gr8blu

    Bolt in connection box of motor cut off

    Ideally the hardware (bolt and nut) will be non-ferrous material that is also non-galvanic and has sufficient tensile strength to deliver enough force to maintain a good electrical connection. In practice, all kinds of hardware combinations get used. Be aware that certain materials and...
  8. Gr8blu

    Fixed Speed Positive Displacement Blowers Running Speed

    Second LittleInch's response. The synchronous speed of an AC machine operating directly-on-line (e.g. no variable frequency drive) is directly proportional to the supply frequency. The proportionality is derived from the following equation. (Synchronous speed in rpm) = 120 * (line frequency...
  9. Gr8blu

    Gas group IIA vs IIB, IIC

    @Op Except for some very specific ratings, most IIA, IIB, and IIC machines are custom. The likelihood that a machine with one classification will exactly match one of another classification is slim to none, even if both are manufactured by the same entity. In addition, the allowable enclosure...
  10. Gr8blu

    Struggling to Bridge Academic Success & Practical Experience in Aero Eng. Help

    Sounds like you know what the books / professors tell you - your GPA is "near perfect". It means you can problem-solve, to a certain extent. How well you can do in an extemporaneous situation remains to be seen. You also tried to work in some "practical" background through competitions...
  11. Gr8blu

    Capital Essentials............................

    See corporate "blurb" at following link. My take is that Capital Essentials is strictly 2D, with the ability to interact with 3D models. https://static.sw.cdn.siemens.com/siemens-disw-assets/public/2tEOMv3CylZyKp6Wb247CQ/en-US/Siemens%20SW%20Capital%20Essentials%20Fact%20Sheet.pdf
  12. Gr8blu

    Shaft Failure in Translation Gear Reducer of Bucket Wheel – Need Help Identifying Cause

    OP: Examine the exposed surface of the failed piece - and the exposed surface of the other section not shown in your photo, if available. Determine the failure mode (ductile or brittle) and method (tensile, torsion, or bending). What causes specific combinations of mode and method? Usually...
  13. Gr8blu

    Which country is best for a Master’s in Engineering with good career prospects?

    First question - type of engineering? Second question - why abroad? Third question - in what specific area of the "abroad" country were you looking to land? That third question is important. In Canada, work prospects are very different between Atlantic Canada, Quebec, Ontario, the prairie...
  14. Gr8blu

    Currant imbalance submersible pump

    OP writes: resistance of each phase is similar (to within 5 milliohms, assuming the 0.09 readings given is for OHM, and accounting for rounding error). Presumably, the resistance is measured with each phase disconnected at the drive and includes both the cable run to the motor and the motor...
  15. Gr8blu

    Gas group IIA vs IIB, IIC

    In the IEC world, the gas groups IIA, IIB, and IIC are classifications used to categorize flammable gases based on their ignition properties: Group IIA: Contains gases that require a lower energy to ignite, such as propane and butane. Group IIB: Includes gases that require a higher energy to...

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