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  1. Sparky1963

    Service transformer size

    Refer to NEC 220 for service and feeder calculations. Power Companies usually size their transformers for 50%-60% of connected load. However, they are not governed by the NEC.
  2. Sparky1963

    CT Location on Outgoing MV Feeder Breaker

    [ponder] In MV metal-clad switchgear, are the CT's for a 50/51 relay on an outgoing feeder breaker usually located on the line side or load side of the feeder breaker? What is the most common practice and why?

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