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  1. bayoubare

    Undervoltage Protection with Current Supervision ?

    undervoltage is suppervised by current to prevent a false trip due to a blown pt fuse. If there is a loss of potential but have no change in current the loss of voltage can not be real. So if current remains stable it protects from blown fuse.
  2. bayoubare

    Motor Tripping Almost Instantly

    Check for broken rotor bars
  3. bayoubare

    Working distance from energized 15 kv shielded cable

    Thanks electricpete ---- I agree with you, I am curious to explore requirements. I can argue both sides however I am looking for the requirements, which appears to be hard to find any clear cut. Thanks again.
  4. bayoubare

    Working distance from energized 15 kv shielded cable

    I am just trying to understand the risk. I have not found anyone that would refuse to move or be afraid to touch or be around a SO cable that would power you typical 480vac portable equipment such as a welding machine. Such equipment may have an arc flash level of 40- 100 cal. per centimeters...
  5. bayoubare

    Working distance from energized 15 kv shielded cable

    Furthermore, even if you have de-energized the offending cable, and moved it, it might fail due to the above reasons when it is re-energized. rasevskii-- you do not ever recommend test a cable ? Even if the entire switchgear is de-enegized a cable must be moved to be tested. Using your logic...
  6. bayoubare

    Working distance from energized 15 kv shielded cable

    I guess this is where I am getting confused. The restricted approach distance from an exposed live conductor was 2.2 feet. The only exposed conductor is in the cubicle above which is 4- 5 feet in a straight line but there is a metal plate between the cubicles. There is an energized conductor...
  7. bayoubare

    Working distance from energized 15 kv shielded cable

    We are working in the back of 12 year old switchgear; the cables are good condition, 12 year old clx with EPR insulation. There are two breakers behind the rear door of the switchgear, one on top of the other separated by a metal plate. We would be working on the bottom cubical which is...
  8. bayoubare

    Working distance from energized 15 kv shielded cable

    Are there any guidelines for minimum clearances required for working near an energized 15 KV shielded cable?
  9. bayoubare

    Causes of UPS Fire

    a cause of the fire could have been an out of sync transfer.
  10. bayoubare

    Station Battery Load Testing

    #1 Ensure that the 12 volt mono blocks are sized properly to support the connected load for the time peroid that you require. # 2 match voltage leveles when parrelleling batteries.
  11. bayoubare

    Using battery charger as power supply???

    Not all battery chargers can be used as a power supply. Some chargers have little or no filtering, they use the battery as the filter. If the charger is not a "battery elimator" there may be ac ripple on the output of the charger.
  12. bayoubare

    Battery Room Ventilation

    IEEE 484-2002 ----5.4
  13. bayoubare

    Battery Room Ventilation

    The battery area shall be ventilated, either by a natural or mechanical ventilation system, to prevent accumulation of hydrogen. The ventilation system shall limit hydrogen accumulation to less than 2% of the total volume of the battery area. The location should be free of areas that might...

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