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  • Users: RIA123
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  1. RIA123

    Lightening Arrester Rating

    Guys – Need your help in selecting right sized Lightening Arrester. I have to select an L.A. for the Primary of a substation transformer which has delta connected Primary at 115 kV. This substation transformer 115kV, Delta-Primary/ 23kV Secondary Y-solidly grounded, is being fed by a utility...
  2. RIA123

    Cable Ampacity Calcs.

    Hi Guys I am calculating Cable Ampacity of 8x3C-750 MCM cables that run in free air for around 20 feet and then enter into a trench that is around 19 feet long. One end of the trench is open and the second end opens up in a cable pit. Cables occupy less than 12% of the trench area - so around...
  3. RIA123

    Cable Ampacity Calculations

    Gents I am working on Cable Ampacity Calcs on EDSA software. Three single phase cables are going to a transformer and three out going feeders (9 cables-single phase cables) are placed in a concrete duct bank - all cables have concentric neutral wires for return current. The cables are designed...

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