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  • Users: ksps100
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  1. ksps100

    GFCI with 120V Receptacles in Hazardous Area

    Dear ALL, We have Class 1 Div 2 Group B,C,D Area in a part of the plant and the rest of the Plant is classified as Class 1 Div 2 Group C,D area. The specification states that ALL Conveinience receptacles(120V Single phase,Explosion proof type) shall be provided with Ground Fault Circuit...
  2. ksps100

    Instrument Grounding

    Dear ALL, Kindly advise the import of the following: 1)Instrument Reference Ground 2)Instrument Safety Ground We have Electrical Main Grounding grid of 70mm2 Copper conductor,but the entire Instrumentation system(DCS,etc) is connected to a Ground grid developed using separate tripods and...
  3. ksps100

    Sizing of Neutral Grounding Resistors

    Dear ALL, We have installed Neutral Grounding Resistors on the Neutral of a 34.5kV/480V Delta / Star Transformers. Its rated as 400A,10Secs. Kindly advise what is the sizing criteria for NGR's. What are the applicable Standards and codes for sizing NGR's. Can I get some reference materials for...
  4. ksps100

    Motor ratings

    Dear ALL, We have a motor that is rated as Class B,Ambient=40Deg C,and Service Factor-1.15. My spec calls for all motors to be rated Class F, Ambient=50Deg C .Service Factor to be defined by Vendor Will the change of Service factor from 1.15 to 1 enable the motor to be rated for Class F and...
  5. ksps100

    Diesel Enginer Generator-Cranking Motor Cable size

    Hi All, I have a DEG whose Cranking motor current requirement at firing speed is = 1000A DC. How would I size the Cable for this? (Cable to be laid between the Battery terminals to the Cranking motor terminals). I plan to use XLPE Insulated 1 Core cables.I have sizes of 50mm2,95mm2,120mm2 and...
  6. ksps100

    Cable Armor Grounding

    Hi All We are using Steel Wire Armored cable in our project. Cable Glands are used to fix the Cable to the Switchgear at the Switchgear end and at the Motor hub also. We use Brass earth tags to connect the Armor to Ground at the Switchgear end. Is it compulsory to Ground the Armor to Ground at...
  7. ksps100

    Transformer Stability tests

    Hi All, We have been doing Transformer Stability tests at our project. The System details are: Transformer - 34.5kV/.480kV,Delta-Star,3Ph,60Hz The Transformer Secondary Neutral point is connected to Earth through a High Resistance Ground Unit. A typical Transformer Differential protection...

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