![]() It also is safer since the entire facility can be operated with one operating train shut down for maintanence. It is only slight, but it is statistically significant if the "live bus" side includes automatic starts. Statistically, Figure “g” is the most reliable since it has one less component (the tie breaker) to fail. I’ve attached a sketch with various potential distribution systems. Most people don't recognize that, for continuous process facilities, it's more important to provide spare load capacity than spare source capacity. Having done several FMEA (Failure Modes and Effects Analysis) as recommended by NFPA 70B, Section 26.5 over the years, including the largest refinery in the world, and battling CMP1 over Section 110.9 implications for short-circuit duties, I’ve come to the conclusion that eliminating the tie altogether is probably the most cost effective, reliable and safest solution. ![]() Click to expand.It depends on the purpose of the tie.
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