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  1. splitbolt

    NFPA 70 Underground Feeder Sizing

    You can derate off of the 90 deg column as long as your final ampacity is not over the 75 deg colomn value per 110.14(c). At 80% 350 kcmil would work.
  2. splitbolt

    Delta connected transformer jumpers

    I have three single phase 250 KVA transformers 2400 V pri / 480 V sec. The primary is why connected on 4160 V supply and the secondary is ungrounded delta connected. The load conductors are connected to X3 on each transformer and the delta connection jumpers are connected from X3 on each...
  3. splitbolt

    Flashover in MCC

    DanDel, the breakers and starters do not burn up they carbon track past the point of safe reliable operation.
  4. splitbolt

    Flashover in MCC

    I maintian a Hammermill that has a control cabinet built in 1960. The supply voltage to the MCC is 500V ungrounded delta. The MCC has a 400A main breaker with 25 #10 AWG conductors per phase on the load side feeding 25 30A G.E. breakers and starters in the same cabinet. The MCC was site built to...

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